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通过对二代棉铃虫的连续调查观测,发现山东省鱼台县二代棉铃虫初见卵期在6月15日前后,卵高峰期在6月下旬,结束期为7月上旬,总卵期25 d左右。在这段时间应采取有效措施,防止二代棉铃虫发生。同时还发现二代棉铃虫与气象条件关系密切,除与温度、湿度有关外,还与降水有关。6月上旬降水少,6月中旬至7月上旬降水多且持续时间长,是造成二代棉铃虫大发生的一个重要原因。
Through the continuous investigation and observation of the second generation cotton bollworm, it was found that the second generation cotton bollworm in Yutai County of Shandong Province saw the egg period around June 15, the peak egg age in late June and the end time of early July, Around 25 d. During this period should take effective measures to prevent the occurrence of second generation cotton bollworm. Also found that the second generation of cotton bollworm and weather conditions are closely related, in addition to temperature and humidity, but also with the precipitation. Precipitation is less in early June, and more precipitation and longer duration from mid-June to early July is an important reason for the large-scale occurrence of the second generation cotton bollworm.