Effects of Environmental Factors on Egg Development and Hatching of
Blaps rhynchopetera (Coleoptera: Tenebrionidae)

JI Huan-hong; FENG Ying; ZHAO Min; CHEN Zhi-yong; CHEN Xiao-ming; YE Shou-de

Effects of environmental factors including temperature, illumination and water content of substrate on egg hatching of Blaps rhynchopetera Fairmaire were studied in artificial climate chambers and room temperature. The results showed that the eggs could hatch out from 12 ℃ to 28 ℃, the development duration was shortened and the developmental rate increased with the rise of temperature from 12 ℃ to 28 ℃. The optimal temperature was between 12—25 ℃. Eggs could not hatch at the temperature below 8 ℃ or over 31 ℃. The developmental threshold temperature required for eggs was 10.08±0.93 ℃, and the effective accumulated temperature was 99.91±8.11 degree-day. Among constant illumination of 0—12 000 lx, the hatching rates were reduced with the increase of illumination, and larvae were not found after treating eggs with constant illumination over or equal to 8 000 lx. In the experiment of temperature and water content of substrate, both the temperature and water content of substrate and their interaction effect influenced significantly on the hatching rate. The optimal combinations of substrate temperature and water content were selected based by multiple comparisons. The climatic factors limiting eggs hatching of this insect in Yunnan were also discussed in this paper.

Effects of Environmental Factors on Egg Development and Hatching of Blaps rhynchopetera (Coleoptera: Tenebrionidae)

1. Research Institute of Resource Insects, Chinese Academy of Forestry

Abstract: Effects of environmental factors including temperature, illumination and water content of substrate on egg hatching of Blaps rhynchopetera Fairmaire were studied in artificial climate chambers and room temperature. The results showed that the eggs could hatch out from 12 ℃ to 28 ℃, the development duration was shortened and the developmental rate increased with the rise of temperature from 12 ℃ to 28 ℃. The optimal temperature was between 12—25 ℃. Eggs could not hatch at the temperature below 8 ℃ or over 31 ℃. The developmental threshold temperature required for eggs was 10.08±0.93 ℃, and the effective accumulated temperature was 99.91±8.11 degree-day. Among constant illumination of 0—12 000 lx, the hatching rates were reduced with the increase of illumination, and larvae were not found after treating eggs with constant illumination over or equal to 8 000 lx. In the experiment of temperature and water content of substrate, both the temperature and water content of substrate and their interaction effect influenced significantly on the hatching rate. The optimal combinations of substrate temperature and water content were selected based by multiple comparisons. The climatic factors limiting eggs hatching of this insect in Yunnan were also discussed in this paper.

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Effects of Environmental Factors on Egg Development and Hatching of Blaps rhynchopetera (Coleoptera: Tenebrionidae)

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