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长沙和全国许多地区一样,稻纵卷叶螟原为局部偶发性次要害虫,六十年代数量上升,现已成为水稻主要害虫之一。 我们于1976～1978年在长沙地区对稻纵卷叶螟作了一些田间调查和观察。现将初步结果整理如下。 一、越冬问题 1.幼虫的越冬问题 据我们用低融冰盐合晶作抗寒力测定的结果
Changsha, like many other parts of the country, was originally a sporadic minor pest of rice and its population increased in the 1960s. It has become one of the major pests in rice. We conducted some field surveys and observations on C. medinalis in Changsha from 1976 to 1978. The preliminary results are now organized as follows. First, the problem of overwintering 1. Larvae overwintering problem According to our low melting ice salt crystal for the determination of the results of the cold hardiness