NGHIÊN CỨU ẢNH HƯỞNG CỦA MỘT SỐ YẾU TỐ TỚI MẬT ĐỘ BỌ XÍT BẮT MỒI Coranus fuscipennis (Heteroptera: Reduviidae) TRÊN CÂY ĐẬU RAU (ĐẬU ĐŨA, ĐẬU TRẠCH) Ở VÙNG HÀ NỘI, 2011.

The effects of 3 kinds of insecticides to assassin bug (Coranus fuscipennis) shown that: one day after spraying Secsaigon 10 EC has killed 78.14% of C. fuscipennis individuals, Oshin 20WP has killed 71.22 % of C. fuscipennis individuals and Tap Ky 1.8 EC has killed 24.46% of C. fuscipennis individuals. The mortality rate of Coranus fuscipennis increased 10 days after spraying with Secsaigon 10 EC and Oshin 20WP (dead rate search to 100%). Planting time of long bean and French bean were also affect to the density of C.fuscipennis. The average density of C. fuscipennis was lowest in late crop at Song Phuong, Hoai Duc, Ha Noi, after that to middle crop and hitghest in early crop were 0.09 ± 0.05 individuals/m2, 0.17 ± 0.04 individuals/m2 and 0.13 ± 0.03 individuals/m2, respectively. The long beans were growing on the greenhouse at Linh Nam, Ha Noi, the density of C. fuscipennis was higher than and development earlier than on the long beans growing on outside of greenhouse. The average density of C. fuscipennis on long beans growing in greenhouse was 0.28 ± 0.08 individuals/m2 higher that on outside greenhouse (0.16 ± 0.05 individuals/m2) but this dentify too search to peak was 0.52 individuals/m2.