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瓜绢螟在上海地区曾发生过,但虫量不大,寄生率极低。近几年来,瓜绢螟发生量逐年上升。据调查,几乎每一田块都有瓜绢螟。寄生率高的可达100％,单株虫口多达几十条。且整个生长期都有发生。所以,了解瓜绢螟的生活史及其消长规律,及时防治,以减少它的为害显得十分必要。一、田间调查据浙农大1989年的报道,瓜绢螟在杭州地区是迁徙性的。根据我们近几年的调查,还未发现过越冬卵、蛹、成虫,且在春栽黄瓜上也未查到过瓜绢螟幼虫。瓜绢螟幼虫在本地的始见期为7月上旬
Ginger silkworm has occurred in Shanghai area, but the insects are not large parasitic rate is very low. In recent years, the occurrence of melon silkworm increased year by year. According to the survey, almost every field lotus has silkworm borer. High parasitism up to 100%, as many as dozens of single insect population. And the whole growth period have occurred. Therefore, it is necessary to know the life history and the law of growth and decline, and to prevent it in time so as to reduce its damage. First, the field survey According to the report of Zhejiang Agricultural University in 1989, melon silkworm is migratory in Hangzhou. According to our investigation in recent years, we have not found any overwintering eggs, pupae and adults, and we did not find any larvae on the cucumber in spring. Ginger borer larvae in the local initial period of early July