1996 Vol. 9, No. 6
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1996, 9(6): 561-567.
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Abstract:
The results of a second generation progeny trial of E.urophylla involved 44open-pollinated families at the age of 5-years in West ern Guang dong Province showed that there were highly signif icant differences among families at the growth and the quality charac-ters. The growth and quality of E.urophy lla were moder rately or strongly her editary. Stemheight below the forestlimb, stem straightness and ramif ication had highly signif icant positive genet iccor relations with the growth characters, wood density had also a positive genet icco rrelation with the index of typho on resist ance, and a negat ivegenet iccorr elat ions with other characters. Index selection in consider ation of the herit abilit is and economic value of multi-chrarcters enable genetic improvem ent to get good expected genet icgains of mult icharacters, the genet icgains int he treeheight、DBH、volume、wood density、index of typho on resis-tance of 25 good families selected by moret hant he mean of selective indexvalue are respectively 2.84%, 5.17%, 12.67%, 3.2% and 2.62%. The stemheight belowt he forestlimb、stemst raight ness and ramif icatio nwill be reached 12.24%, 7.95% and 4.43%.
The results of a second generation progeny trial of E.urophylla involved 44open-pollinated families at the age of 5-years in West ern Guang dong Province showed that there were highly signif icant differences among families at the growth and the quality charac-ters. The growth and quality of E.urophy lla were moder rately or strongly her editary. Stemheight below the forestlimb, stem straightness and ramif ication had highly signif icant positive genet iccor relations with the growth characters, wood density had also a positive genet icco rrelation with the index of typho on resist ance, and a negat ivegenet iccorr elat ions with other characters. Index selection in consider ation of the herit abilit is and economic value of multi-chrarcters enable genetic improvem ent to get good expected genet icgains of mult icharacters, the genet icgains int he treeheight、DBH、volume、wood density、index of typho on resis-tance of 25 good families selected by moret hant he mean of selective indexvalue are respectively 2.84%, 5.17%, 12.67%, 3.2% and 2.62%. The stemheight belowt he forestlimb、stemst raight ness and ramif icatio nwill be reached 12.24%, 7.95% and 4.43%.
1996, 9(6): 568-572.
Abstract:
It is necessary to determine the ratio between variance of sampling error e of quadratic average diameter Dg and that of sampling error ∈ of the tree numbers N per unit area when measurement error models is applied to estimate the parameters of a model between Dg and N,in a study on stand self thinning processes.This paper calculated and compared the variance ratios between transformd quadratic average diameter and transformd number of trees per unit area by using resampling from 20 larch plantation plots.The results show that the ratio between variance of ln( N ) and Dg approaches to a constant 3.0248 ×10-2. From the results,the best form of variable transformation is determined and the structure of error matrix is constructed,which can be used to get more accurate estimate of model parameters.
It is necessary to determine the ratio between variance of sampling error e of quadratic average diameter Dg and that of sampling error ∈ of the tree numbers N per unit area when measurement error models is applied to estimate the parameters of a model between Dg and N,in a study on stand self thinning processes.This paper calculated and compared the variance ratios between transformd quadratic average diameter and transformd number of trees per unit area by using resampling from 20 larch plantation plots.The results show that the ratio between variance of ln( N ) and Dg approaches to a constant 3.0248 ×10-2. From the results,the best form of variable transformation is determined and the structure of error matrix is constructed,which can be used to get more accurate estimate of model parameters.
1996, 9(6): 573-578.
Abstract:
Periodical investigation and systematic study on the fertilization to Eucalyptus urophylla stand were conducted for 9 years.5 fertilization methods (1.Nil,2.N100,3.P50,4.N100 P50,5.N100 P50 K50 )were adopted.The main results show that the tree growth can be promoted and the rotation time can be shortened by the application of fertilizer;a plenty of basal dressing can be available in the whole rotation(5～6 years);NPK is the best one in the fertilizer regimes used in fertilizer trials;the effects of various fertilizers are different,of which nitrogenous fertilizer is not effective, but phosphatic fertilizer is outstanding.
Periodical investigation and systematic study on the fertilization to Eucalyptus urophylla stand were conducted for 9 years.5 fertilization methods (1.Nil,2.N100,3.P50,4.N100 P50,5.N100 P50 K50 )were adopted.The main results show that the tree growth can be promoted and the rotation time can be shortened by the application of fertilizer;a plenty of basal dressing can be available in the whole rotation(5～6 years);NPK is the best one in the fertilizer regimes used in fertilizer trials;the effects of various fertilizers are different,of which nitrogenous fertilizer is not effective, but phosphatic fertilizer is outstanding.
1996, 9(6): 579-585.
Abstract:
This study deals with tissue sub culture of three important commercial rattan species,namely Calamus simplicifolius、Daemonorops margaritae and Calamus egregius. Periodic characteristics of the propagule were observed among species and their families during the whole culture period.The results showed that the whole development period of sub culture can be divided into three stages,i.e.adaptive stage,propagation stage and slow death stage.The study also revealed the development pattern in one generation,from callus recovery,rapid growth and aging.All these results provided important information for determining the appropriate time for transferring.
This study deals with tissue sub culture of three important commercial rattan species,namely Calamus simplicifolius、Daemonorops margaritae and Calamus egregius. Periodic characteristics of the propagule were observed among species and their families during the whole culture period.The results showed that the whole development period of sub culture can be divided into three stages,i.e.adaptive stage,propagation stage and slow death stage.The study also revealed the development pattern in one generation,from callus recovery,rapid growth and aging.All these results provided important information for determining the appropriate time for transferring.
1996, 9(6): 586-592.
Abstract:
The trials were made on the hypocotyl collection,planting method,afforestation with different densities and different tide drowning depths of Kandelia candel. The best season of hypocotyl collection in Hainan,Lianjiang and Shenzhen is from February 5 to March 5,February 25 to Aprial 25,and March 5 to May 5 respectively.The survival rate is over 88% if the planting with hypocotyl is adopted and the hypocotyl is planted properly deep(2/3 length of it) in the flat with soft silt,strong wind and tide.On the contrary,it is below 37% if the transplanting with seedlings or young trees of one to several years old is adopted.The mudflat height above tide datum plane,where the young trees can grow,must be first selected carefully, because the growth of seedlings and young trees is greatly affected by the tide drowned depth.The mudflat height suitable to planting for each area is different according to different tide characters,and the height should be above 1.3m in Shenzhen bay.The space of initial plantation should be 0.5m×1.0m or 1m×1m.
The trials were made on the hypocotyl collection,planting method,afforestation with different densities and different tide drowning depths of Kandelia candel. The best season of hypocotyl collection in Hainan,Lianjiang and Shenzhen is from February 5 to March 5,February 25 to Aprial 25,and March 5 to May 5 respectively.The survival rate is over 88% if the planting with hypocotyl is adopted and the hypocotyl is planted properly deep(2/3 length of it) in the flat with soft silt,strong wind and tide.On the contrary,it is below 37% if the transplanting with seedlings or young trees of one to several years old is adopted.The mudflat height above tide datum plane,where the young trees can grow,must be first selected carefully, because the growth of seedlings and young trees is greatly affected by the tide drowned depth.The mudflat height suitable to planting for each area is different according to different tide characters,and the height should be above 1.3m in Shenzhen bay.The space of initial plantation should be 0.5m×1.0m or 1m×1m.
1996, 9(6): 593-597.
Abstract:
There is no obvious difference of the culm yield between culm cutting age of 4～5 and 6～7 years old in the bamboo stands,which are intensively cultivated by soil digging and fertilization. Compared with culm cutting time of December in on year in a common timber bamboo stands,the culm cutting in growing season of March,June and September makes no significant difference in culm yield. But,the great yield decrease will be caused by the cutting in December of off year when should be refrained from culm cutting. As to the relative yield, there is a tendency to be higher by cutting in June or September than in December. The stands yield by cutting times of 1,2,3,4 respectively in one year(March,June, uly,August, September, December)has no significant difference from that by one time cutting in December of a on-year.
There is no obvious difference of the culm yield between culm cutting age of 4～5 and 6～7 years old in the bamboo stands,which are intensively cultivated by soil digging and fertilization. Compared with culm cutting time of December in on year in a common timber bamboo stands,the culm cutting in growing season of March,June and September makes no significant difference in culm yield. But,the great yield decrease will be caused by the cutting in December of off year when should be refrained from culm cutting. As to the relative yield, there is a tendency to be higher by cutting in June or September than in December. The stands yield by cutting times of 1,2,3,4 respectively in one year(March,June, uly,August, September, December)has no significant difference from that by one time cutting in December of a on-year.
1996, 9(6): 598-601.
Abstract:
The result of seedling test of Paulownia fortuneii conducted in Yanzhou City of Shandong Province showed that: 1.The difference of height and ground diameter of the saplings among different provenances was significant, and the influence of site on sapling height was greater than that on its ground diameter; 2.Temperature was the main controlling factor to its growth,of which,low temperature was the most important;3.At the 35°N northern cultivation border,the cultivars from Xinchun of Hubei Province and Luoshan of Henan Province were the more appropriate ones.
The result of seedling test of Paulownia fortuneii conducted in Yanzhou City of Shandong Province showed that: 1.The difference of height and ground diameter of the saplings among different provenances was significant, and the influence of site on sapling height was greater than that on its ground diameter; 2.Temperature was the main controlling factor to its growth,of which,low temperature was the most important;3.At the 35°N northern cultivation border,the cultivars from Xinchun of Hubei Province and Luoshan of Henan Province were the more appropriate ones.
1996, 9(6): 602-609.
Abstract:
A series of tests was conducted for five years to go further into the technology of raising per unit yield and improving seed quality in Zhejiang Chinese fir seed orchards. Investigations were conducted in these primary seed orchards on its management and adminstration level,and its year yield variation.And the biological and environmental factors were also monitored and collected systematically that would influence the production of Chinese fir seed orchards. The high seed yield technology was thus formed based on above mentioned work. The paper reaveled that the tree parents selection and dispose,and the site selection were the base for high seed yield and superior quality in Chinese fir seed orchard,that the cultivation of stock plants and artificial supplementary pollination were the key factors,and that the fertilization,tree density management,control of insect and disease etc. were the promise of seed production.
A series of tests was conducted for five years to go further into the technology of raising per unit yield and improving seed quality in Zhejiang Chinese fir seed orchards. Investigations were conducted in these primary seed orchards on its management and adminstration level,and its year yield variation.And the biological and environmental factors were also monitored and collected systematically that would influence the production of Chinese fir seed orchards. The high seed yield technology was thus formed based on above mentioned work. The paper reaveled that the tree parents selection and dispose,and the site selection were the base for high seed yield and superior quality in Chinese fir seed orchard,that the cultivation of stock plants and artificial supplementary pollination were the key factors,and that the fertilization,tree density management,control of insect and disease etc. were the promise of seed production.
1996, 9(6): 610-615.
Abstract:
rhizobial strains,isolated from root nodules of 51 species of woody legumes(5 genera in subfamily Mimosoideae and 18 genera in subfamily Papilionoideae) were inoculated with two tree legumes ( Robinia pseudoacacia,Albizia julibrissin )and two herbaceous legumes ( Glycine max, Pisum sativum ). 50 days after cultivation of legume seedlings,the nodulation rates of the locust,silk tree,soybean and pea were 100%,87.9%,69.7% and 25.8% respectively.Among all the rhizobial strains 12 were nodulated on all of the 4 leguminous species,29 on locust, silk tree and soybean,and 4 on locust,silk tree and pea simultaneously.It has been shown that the root nodule bacteria of woody legumes have a wide range of hosts,but each rhizobial strain makes a great difference in affinity with different legumes,nodulation characters and nitrogen-fixing capacity.It seems that the host plant usually determines the shape and color of the nodules.
rhizobial strains,isolated from root nodules of 51 species of woody legumes(5 genera in subfamily Mimosoideae and 18 genera in subfamily Papilionoideae) were inoculated with two tree legumes ( Robinia pseudoacacia,Albizia julibrissin )and two herbaceous legumes ( Glycine max, Pisum sativum ). 50 days after cultivation of legume seedlings,the nodulation rates of the locust,silk tree,soybean and pea were 100%,87.9%,69.7% and 25.8% respectively.Among all the rhizobial strains 12 were nodulated on all of the 4 leguminous species,29 on locust, silk tree and soybean,and 4 on locust,silk tree and pea simultaneously.It has been shown that the root nodule bacteria of woody legumes have a wide range of hosts,but each rhizobial strain makes a great difference in affinity with different legumes,nodulation characters and nitrogen-fixing capacity.It seems that the host plant usually determines the shape and color of the nodules.
1996, 9(6): 616-619.
Abstract:
Serious black locust canker occurs in Shandong coastal areas. Pathogenetic fungi are identified as Fusarium oxysporum and Fusarium solani. Microconidia of the first aggregate a capitulum and develop on the single ampuliform conidiophore. Microconidium are elliptic and botuliform in shape,7.6～15.4 μm× 2.5～3.8 μm and macroconidium are falciform and cambiform with 3～5 septum,28.2～38.4 μm×4.6～5.1 μm. The diameters of chlamydospore are 8.9～12.8 μm. For the second,microconidia grow on the elongated conidiophore and the shapes are broad ovate and elliptic,5.1～10.2 μm ×2.5～4.8 μm. Conidiophore are 30～80 μm in length. Macroconidium is blunt at both ends with 3～5 septum,20.1～33.3 μm× 2.6～5.4 μm. Chlamydospore are 7.7～10.2 μm in diameters. The appropriate temperature for the colony growth is 25～30 ℃ with 28 ℃ as the optimum. The range of pH is 5～9 and micro acid or neutrality is the most favourable. The best origin of carbon is sucrose or glucose,and peptone is best nitrogen source. F. oxysporum has stronger pathogenicity and is the main pathomycete of black locust canker.
Serious black locust canker occurs in Shandong coastal areas. Pathogenetic fungi are identified as Fusarium oxysporum and Fusarium solani. Microconidia of the first aggregate a capitulum and develop on the single ampuliform conidiophore. Microconidium are elliptic and botuliform in shape,7.6～15.4 μm× 2.5～3.8 μm and macroconidium are falciform and cambiform with 3～5 septum,28.2～38.4 μm×4.6～5.1 μm. The diameters of chlamydospore are 8.9～12.8 μm. For the second,microconidia grow on the elongated conidiophore and the shapes are broad ovate and elliptic,5.1～10.2 μm ×2.5～4.8 μm. Conidiophore are 30～80 μm in length. Macroconidium is blunt at both ends with 3～5 septum,20.1～33.3 μm× 2.6～5.4 μm. Chlamydospore are 7.7～10.2 μm in diameters. The appropriate temperature for the colony growth is 25～30 ℃ with 28 ℃ as the optimum. The range of pH is 5～9 and micro acid or neutrality is the most favourable. The best origin of carbon is sucrose or glucose,and peptone is best nitrogen source. F. oxysporum has stronger pathogenicity and is the main pathomycete of black locust canker.
1996, 9(6): 620-624.
Abstract:
This paper mainly deals with the characteristics of soil enzyme activities and the influence of tree root system on soil enzymes. The conclusions are as follows:(1)The relationship between the soil enzyme activities is close. The soil enzyme activities near the shelter forest are much stronger than those in the farther place. (2)The vertical variation rules are complex,the activities of invertase and alkaline phosphatase are on a decline from the surface soil to deep soil. Near the shelterforest,the activities of urease and protease are the highest at 0～10 cm and 20～40 cm respectively whereas in the farther place their values decline from the surface to deep soil. The enzyme activities of rhizosphere soil are stronger than those of non rhizosphere soil. (3) Tree root system,especially the root the diameter of which is thinner than 1 mm,could remarkably increase the soil enzymes activities.
This paper mainly deals with the characteristics of soil enzyme activities and the influence of tree root system on soil enzymes. The conclusions are as follows:(1)The relationship between the soil enzyme activities is close. The soil enzyme activities near the shelter forest are much stronger than those in the farther place. (2)The vertical variation rules are complex,the activities of invertase and alkaline phosphatase are on a decline from the surface soil to deep soil. Near the shelterforest,the activities of urease and protease are the highest at 0～10 cm and 20～40 cm respectively whereas in the farther place their values decline from the surface to deep soil. The enzyme activities of rhizosphere soil are stronger than those of non rhizosphere soil. (3) Tree root system,especially the root the diameter of which is thinner than 1 mm,could remarkably increase the soil enzymes activities.
1996, 9(6): 625-632.
Abstract:
Pinus caribaea var. caribaea from Cuba was introduced to southern China in 1963 with P. caribaea var. hondurensis from Guatemala and var. bahamensis following in 1973. However,it was not until 1983 that combined variety/provenance testing was established on several sites with a range of provenance. The combined provenance/progeny trials were also established with the three varieties in 1990 using seeds representing the whole distribution range. A breeding seedling orchard of var. caribaea has been established using a multiple population breeding strategy. The strategy is conceived to combine the functions of genetic testing,selection breeding and seed production. At the same time it both permits gene conservation and provides long term flexibility for advanced generation breeding.
Pinus caribaea var. caribaea from Cuba was introduced to southern China in 1963 with P. caribaea var. hondurensis from Guatemala and var. bahamensis following in 1973. However,it was not until 1983 that combined variety/provenance testing was established on several sites with a range of provenance. The combined provenance/progeny trials were also established with the three varieties in 1990 using seeds representing the whole distribution range. A breeding seedling orchard of var. caribaea has been established using a multiple population breeding strategy. The strategy is conceived to combine the functions of genetic testing,selection breeding and seed production. At the same time it both permits gene conservation and provides long term flexibility for advanced generation breeding.
1996, 9(6): 633-639.
Abstract:
Forest insects are mainly divided into natural enemies, pollinating insects, medical insects, edible insects, industrial insects and cultural insects. This paper deals with the current researching status and future prospects of these six kinds of resources, and discusses the relationship between exploiting forest insect resources and controlling forest pest.
Forest insects are mainly divided into natural enemies, pollinating insects, medical insects, edible insects, industrial insects and cultural insects. This paper deals with the current researching status and future prospects of these six kinds of resources, and discusses the relationship between exploiting forest insect resources and controlling forest pest.
1996, 9(6): 640-645.
Abstract:
From 1990 to 1992, experiments on the effect of fertilization on the change of nutrient content in soil and leaf in young loblolly pine plantation were conducted in Longchang County, Sichuan Province. The result showed that the nitrogen content in soil increased in the following year after corresponding amount of fertilizer was applied, within a range of 0.01～0.22 g/kg. Nitrogenous and potash fertilizer should be applied once every two years. In order to increase phosphorus content and control the content of Al3+ and H+ in soil, calcium magnesium phosphate should be applied. Nitrogen and phosphorus in leaves were positively related with the application of nitrogenous and phosphorus fertilizer in soil. The relationship between the potassium content of leaf and the application of potash fertilizer in soil was complicated. Whether the application of calcium fertilizer was conducted or not, calcium contents of terminal leaf and lateral leaf decreased gradually from 1900 to 1992, within a range of 1.67～3.86 mg/g and 2.45～5.18 mg/g respectvely.
From 1990 to 1992, experiments on the effect of fertilization on the change of nutrient content in soil and leaf in young loblolly pine plantation were conducted in Longchang County, Sichuan Province. The result showed that the nitrogen content in soil increased in the following year after corresponding amount of fertilizer was applied, within a range of 0.01～0.22 g/kg. Nitrogenous and potash fertilizer should be applied once every two years. In order to increase phosphorus content and control the content of Al3+ and H+ in soil, calcium magnesium phosphate should be applied. Nitrogen and phosphorus in leaves were positively related with the application of nitrogenous and phosphorus fertilizer in soil. The relationship between the potassium content of leaf and the application of potash fertilizer in soil was complicated. Whether the application of calcium fertilizer was conducted or not, calcium contents of terminal leaf and lateral leaf decreased gradually from 1900 to 1992, within a range of 1.67～3.86 mg/g and 2.45～5.18 mg/g respectvely.
1996, 9(6): 646-649.
Abstract:
Leaves of in vitro Populus deltoides, P. nigra and P. euramericana were used as explant to be transformed with antibacterial gene LcI which was synthesized according to the sequence of antibacterial protein of Bacillus spp. It was demonstrated that the insect mortality of this antibacterial protein to Anoplophora glabripennis was more than 75%. Transformants were selected by 40 mg/L kanamycin, and the rooting percentage was about 80.7% in the rooting media supplemented with 40 mg/L kanamycin. PCR analysis showed that antibacterial gene has been successfully transformed into these popalr chromosomes.
Leaves of in vitro Populus deltoides, P. nigra and P. euramericana were used as explant to be transformed with antibacterial gene LcI which was synthesized according to the sequence of antibacterial protein of Bacillus spp. It was demonstrated that the insect mortality of this antibacterial protein to Anoplophora glabripennis was more than 75%. Transformants were selected by 40 mg/L kanamycin, and the rooting percentage was about 80.7% in the rooting media supplemented with 40 mg/L kanamycin. PCR analysis showed that antibacterial gene has been successfully transformed into these popalr chromosomes.
1996, 9(6): 650-653.
Abstract:
Two clones seedlings of Chinese fir (Cunninghamia lanceolata (Lamb.)Hook.)with different growing rates (Fast growing pattern CHAO22 and slow growing pattern KAI 4) were used to analyze the change of two importent photosynthate sucrose and starch contents in leaves by day and night. The results showed that:(1) The sucrose content in leaves of fast growing seedling was 80% more than that of the slow growing seedlings.But the starch content of the latter was 4～17% higher than the former one.(2) The sucrose and starch contents in leaves were obviously accumulated in the daytime.The sucrose content at noon was the most.The sucrose contents of fast growing seedlings and slow growing seedlings were 85% and 12% higher than those in the morning,respectively.But the starch content in leaves was the highest in the evening and was over 80% higher than that in the morning.(3)The starch contents in leaves and young shoot of fast and slow growing seedlings were decreased in a single night.They were decreased by 31% and 13% (fast growing seedlings) and by 43% and 24% (slow growing seedlings)respectively. There wasn′t obvious change of sucrose content in leaves of the two kinds of clones in the night,but the starch content in young shoot was obviously decreased. In addition,the relationship between the sucrose content and growth potential was discussed.
Two clones seedlings of Chinese fir (Cunninghamia lanceolata (Lamb.)Hook.)with different growing rates (Fast growing pattern CHAO22 and slow growing pattern KAI 4) were used to analyze the change of two importent photosynthate sucrose and starch contents in leaves by day and night. The results showed that:(1) The sucrose content in leaves of fast growing seedling was 80% more than that of the slow growing seedlings.But the starch content of the latter was 4～17% higher than the former one.(2) The sucrose and starch contents in leaves were obviously accumulated in the daytime.The sucrose content at noon was the most.The sucrose contents of fast growing seedlings and slow growing seedlings were 85% and 12% higher than those in the morning,respectively.But the starch content in leaves was the highest in the evening and was over 80% higher than that in the morning.(3)The starch contents in leaves and young shoot of fast and slow growing seedlings were decreased in a single night.They were decreased by 31% and 13% (fast growing seedlings) and by 43% and 24% (slow growing seedlings)respectively. There wasn′t obvious change of sucrose content in leaves of the two kinds of clones in the night,but the starch content in young shoot was obviously decreased. In addition,the relationship between the sucrose content and growth potential was discussed.
1996, 9(6): 654-657.
Abstract:
The result of the potted experiment shows that,compared with the control and those fertilized with peat,the Populus×xiaozhuanica W.Y.Hsu et Liang seedlings inoculated with bacterial manure are significantly different in the height of the seedlings,the diameter at ground;the number of the leaves,the size of the leaf,etc..Besides,the fiber length of the stem and the nutrient elements in it are both increased obviously.The soil nutrent content is replenished to some extent instead of getting lost.So the soil fertility is well preserved.The result of field afforestation experiment also shows that populus euramericana CL“Bellinii” inoculated with bacterial manure are different obviously with the control and those fertilized with a Ca3(Po4)2 in the height and the diameter at breast height ( DBH ).
The result of the potted experiment shows that,compared with the control and those fertilized with peat,the Populus×xiaozhuanica W.Y.Hsu et Liang seedlings inoculated with bacterial manure are significantly different in the height of the seedlings,the diameter at ground;the number of the leaves,the size of the leaf,etc..Besides,the fiber length of the stem and the nutrient elements in it are both increased obviously.The soil nutrent content is replenished to some extent instead of getting lost.So the soil fertility is well preserved.The result of field afforestation experiment also shows that populus euramericana CL“Bellinii” inoculated with bacterial manure are different obviously with the control and those fertilized with a Ca3(Po4)2 in the height and the diameter at breast height ( DBH ).
1996, 9(6): 658-660.
Abstract:
Leiometopon simyrides is an important insect pest in China.In 1993,a virus was isolated from a diseased larva.Electronic micrographs revealed that it is of a nuclear polyhedrosis virus.The size of its polyhedral inclusion bodies is about 0.92～1.92 μm.The virions measure about 300 nm×44 nm.They are rod shaped.There is multiples embedded in polyhedrosis.The infection tests showed that the pathogen was found to be highly infections to the larvae of Leiometopon simyrides.
Leiometopon simyrides is an important insect pest in China.In 1993,a virus was isolated from a diseased larva.Electronic micrographs revealed that it is of a nuclear polyhedrosis virus.The size of its polyhedral inclusion bodies is about 0.92～1.92 μm.The virions measure about 300 nm×44 nm.They are rod shaped.There is multiples embedded in polyhedrosis.The infection tests showed that the pathogen was found to be highly infections to the larvae of Leiometopon simyrides.
1996, 9(6): 661-663.
Abstract:
The top bud of young ginkgo seedlings( Ginkgo biloba L.)was cut down to promote branching on the 3rd April,4th June,28th August,respectively.It shows that this treatment can make seedings produce more branches,but could reduce is growth after treatment on 3rd April. According to the test,this tretment could be adopted from early to middle June.
The top bud of young ginkgo seedlings( Ginkgo biloba L.)was cut down to promote branching on the 3rd April,4th June,28th August,respectively.It shows that this treatment can make seedings produce more branches,but could reduce is growth after treatment on 3rd April. According to the test,this tretment could be adopted from early to middle June.
1996, 9(6): 664-665.
Abstract:
In this paper two unknown species of males of Parasipyloidea emeiensis Chen et He and Trachythorax fuscocarinatus Chen et He are described. The specimens are kept in the Insect Collection of Beijing Forestry University. All measurements in descriptions are in mm.
In this paper two unknown species of males of Parasipyloidea emeiensis Chen et He and Trachythorax fuscocarinatus Chen et He are described. The specimens are kept in the Insect Collection of Beijing Forestry University. All measurements in descriptions are in mm.
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