川楝素引致菜青虫中毒症状研究

川楝素具有一定的拒食活性,不同浓度处理可因影响试虫的取食反应、进食速度而表现出不同的中毒症状。快速取食或高剂量注射(5μg/头)可使试虫麻痹、昏迷,并引致中肠发生病理变化。较低剂量(0.5～1μg/头注射,100～300μg/mL饲喂)处理或缓慢进食使幼虫化为畸形虫体。其中毒症状较为复杂且有别于常规杀虫剂。

The Toxic Symptoms Caused by Toosendanin to the Larvae of Imported Cabbage Worm(Pieris Rapae L.)

Toosendanin showed strong anti-feedant activity to the imported cabbage worm (Pieris rapae L.). The treated insects appeared to have different symptoms due to the different feeding reactions caused by different concentrations of toosendamn. It might affect the nervous system and cause the larvae to become anaesthetized, damage the digestive systems of the insects, at the dosage of 5 ug/ larva in injecting or 300~ 800 ug / mL in feeding. A certain proportion of the larvae treated with lower concentration of toosendanin (0.5- 1 ug/larva in injecting, 100~ 300 ug/mL in feeding) became abnormal pupae or adults. Results of the experiments indicate that the toxic mechanism of toosendanin to the imported cabbage worm seems to be very complex, and further physiological,biochemical and histological studies are needed.