Study On Biological Aircraft Control Harmful Coastal Crabs Breeding Area Forestry Of Changyi City

This study will discuss the pest control of Hyphantriacunea, Micromelalopha troglodyte and Clostera anachoreta prevention technology using Chlorantraniliprole and B.T preparations along the coastal crab and shrimp breeding areas. 200 g/L and 150 g/hm2 Chlorantraniliprole agent is effective to the prevention of all these pests, which decreases the pest distribution of 88.6%, 90% and 86.8% respectively. At the same time, both of B.T16000 oil agent 750 g/hm2 and B.T8000 water agent 750 g/hm2 produce good effect on decreasing the distribution of Hyphantriacunea, Micromelalopha troglodyte, with dropping rate reaching between 85.9 % to 87.6 % twenty five days after airborne control. However, these agents have been ineffective to Clostera anachoreta, with insect population dropping rate of 16.2% and 15.6% respectively. Safety measurement of these two agents shows that they are irrelevant with the growth of crab and shrimp Considering the climate and geography in coastal crab and shrimp breeding area, the aircrafts are supposed to have the performance of long-distance flight, short operating time and high effectiveness of pest control, such as Ernst dragon TH-28 helicopter, Baer-206 helicopters, and so on. As for the time of pest control, we suggest to choose the larva periods of the first or second generation of these pests, so to save the trouble of a third time pest control of their third generations. The effectiveness of the above agents demonstrates that Chlorantraniliprole is very useful in killing Hyphantriacunea, Micromelalopha troglodyte. While B.T. proves to be effective to Hyphantriacunea, Micromelalopha troglodyte, its use for Clostera anachoreta remains to be tested In 2011, Changyi city has implemented wide-range airborne control of Hyphantriacunea covering an area of 23000 hm2, approaching a dropping rate of 96%, including crab and shrimp breeding area of 3500 hm2 with a dropping rate of 89 %. Therefore, no pest plague happened in 2012. Similarly, in 2013, the area of airborne control was 20000 hm2, with a dropping rate of 97%, including crab and shrimp breeding area of 3400 hm2 with a dropping rate of 86%. In 2014, it was 20000hm2 with the dropping rate of 97%, including crab and shrimp breeding area of 3400 hm2 with the dropping rate of 90%.