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一、农业生态系概述 我县是新棉区,棉田较分散。前期以蚜虫为主,红蜘蛛在粮棉夹种地区的田块发生较重。蕾铃期主要是棉铃虫,红铃虫因没有固定花仓多在露天保存籽花,晒花多以紫穗槐编制花簾,越冬条件很差,因而数量也不大。盲蝽象为害较轻。因本地没有石榴、花椒,棉蚜越冬寄主以木槿为主。苗期棉蚜在一熟棉田,5月中旬巳发生,在麦套棉田到麦收后6月上旬才开始为害;6月底气温逐渐增高,蚜虫数量日趋下降,棉铃虫转为主要害虫。
First, an overview of agricultural ecosystem My county is a new cotton area, cotton more dispersed. Aphids in the early stage, spider mites in the area of grain and cotton crops occurred heavier. The main boll bollworm period is bollworm, pink bollworm because there is no fixed flower storage in the open more than the flower, the sun more flowers to the preparation of Amorpha fritters, overwintering conditions are poor, so the number is not large. Lizards as harm less harm. Because there is no local pomegranate, pepper, aphid wintering host Hibiscus dominated. Cotton aphid seedlings in a mature cotton field in mid-May has occurred in the wheat cotton fields to the wheat harvest after early June began to harm; the end of June temperature gradually increased, the number of aphids declined, the main bollworm pests.