Control of the diamondback moth using antifeedant and oviposition deterrent compounds from Andrographis paniculata

本文研究了热带灌木穿心莲提取物对小菜蛾、小菜蛾（Plultella xylostella， DBM）等害虫取食和产卵的抑制作用。经生物测定鉴定为穿心莲内酯和14-脱氧穿心莲内酯。穿心莲内酯能抑制白腹粉蚧幼虫、棉铃虫、棉铃虫幼虫和绿稻叶蝉、棉铃虫雌成虫的取食，并能抑制白腹粉蚧雌成虫的产卵。为考察穿心莲内酯对白菜田主要害虫的防治效果，进行了田间试验。200和500 ppm浓度的穿心莲内酯对白蝶幼虫和白蝶幼虫的影响较小。以1000ppm的浓度喷洒化学药剂，与微生物杀虫剂（BT）一样，降低了普通白蝇的密度。在大田条件下，穿心莲内酯对白菜植株不稳定。

The present study examined activities of extracts from tropical shrub, Andrographis paniculata, in deterring feeding and oviposition of the diamondback moth, Plultella xylostella (DBM) and other insect pests.Guided by the bioassay test, the compound was identified as andrographolide and 14-deoxyandro-grapholide. Andrographolide deterred the feeding of the DBM larvae, the American cotton bollworm, Helicoverpa armigera larvae and the green rice leafhopper, Nephotettix cincticeps female adults, and it also deterred the oviposition of the DBM female adults.In order to examine the efficacy of andrographolide against major insect pests in cabbage fieled, field experiments were conducted. The andrographolide sprayd at 200 and 500 ppm reduced slightly the DBM larvae population and the common white butterfly larvae. The chemical sprayd at 1,000 ppm reduced the density of the common white as same as a microbial insecticide (BT). Andrographolide was unstable on cabbage plant under field conditions.