紫背金盘提取物对小菜蛾的作用研究

STUDIES ON THE EFFECTIVENESS OF EXTRACTS FROM Ajuga nipponensis TO THE DIAMONDBACK MOTH (Plutella xylostella)

紫背金盘提取物对小菜蛾幼虫有拒食和生长发育抑制活性,以氯仿提取物活性为最高.饲喂处理幼虫出现脱肛、黑斑和畸形等缓慢症状,成虫的生殖过程受到影响,这种作用有利于压低田间种群数量.对多种杀虫剂产生抗性的小菜蛾品系对紫背金盘提取物没有抗性,因此,这种植物提取物可作为小菜蛾抗性治理的一条途径.

Crude extracts of Ajuga nippcmensis possessed antifeedam and growth regulation effects onthe larvae of the diamondback moth. Chloroform extract was the most effective. Symptoms including slowly appearing prolapse of the anus, blackening of the body wall. and malformation of larvae or prepupae; the reproduction process was also affected which might help inhibit the increase of the population in the field. An insecticide resistant strain of diamondback moth showed no resistance to the extract of Ajuga nippanensis. The authors suggest that applications of extracts of this plant would be a new method for the management of diamondback moth resistance.