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明确小菜蛾(Plutella maculipennis)幼虫对甘兰的危害特性,是研究小菜蛾幼虫虫量与甘兰产量关系的重要依据.并可为适龄防治及合理施药提供参考.1982～83年我们对小菜蛾幼虫取食甘兰叶片面积做了测定.在16～21℃室温条件,用指形管单体饲养幼虫,取甘兰中、内层叶饲喂,每诵24小时更换并以坐标纸测算不同龄期幼虫的食叶面积,测定表明,食叶面积随幼虫龄期增加而增长,1龄期幼虫平均每头食叶面积0.038平方厘米,占整个幼虫期食叶面积的2.93%,
It is an important basis to study the relationship between the larvae of Plutella maculipennis and the yield of cabbage in Plutella maculipennis and provide a reference for age-appropriate prevention and treatment and proper application of pesticides. In 1982 ~ 83, Moth larvae were taken to measure the area of cabbage leaves.Under the condition of 16 ~ 21 ℃ room temperature, the larvae were fed with finger tube monomer, and the medium leaves were fed in cabbage, each leaf was replaced 24 hours and counted on coordinate paper The leaf area of larvae at different instars showed that the leaf area of the first instar larvae increased by 0.038 cm 2 per leaf area, accounting for 2.93% of the total larval leaf area.