Study on the Aerial Equipment of Spraying Pesticide and Techniques of Monitoring Ⅲ.Controlling Dendrolimus punctatus by the Aerial Equipment of Dusting Powder

This paper reported the test methods,the technical properties and result of controlling the pine caterpillar by the HU2-HPS-2 dusting equipment when being equipped with the petrel 650B motor-glider.If the control valves put in 1,2,3,4 of the hold backs,the folw powder rates of Beauveria bassiana was 4,10,16.7 and 35.0 kg·min-1 respectively.The swath width was 80 m at the dusting powder.The density granules+spores was 84+48 indi-vidual per cm2.Seven experiment areas were set up in the forest region of the Tuan-jie,Shishuzhan and Dingbiashuku in Wuming County,Guangxi.When being equipped with the petrel 650B motor-glider,the HU2-HPS-2 dusting equipment and polit of the T100 Global Positioning System GPS it was first applied at 100～120 billion spores per gram of B.bassiana of the powder dusting at 1.3～1.5 kg*hm-2 in the six experiment areas,and the average mortality rates of pine caterpillar were 65.4%,88.09%,93.60%,91.99%,80.99% and 81.00% respectively.When being used to control Dasychira axutha,in the 7th experiment region the death ates was 46.77%.