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粘虫在山东省年生三代,有的年份能发生少量四代幼虫。经几年研究认为:影响第一代粘虫猖獗发生的主导因子是,粘虫孵化阶段的降雨量及雨量分布。雨量影响初孵化幼虫的存活;对卵的孵化影响不大。影响第三代粘虫猖獗发生的主导因子是,7月下旬至8月中旬的温湿条件。气温高低对成虫产卵有影响,在这一期间,各旬平均气温在26℃以下,相对湿度在80%以上,就有导致第三代粘虫大发生的可能。草荒严重也是原因之一。根据几年来调查结果:初步认为在本省一定环境下,少量粘虫蛹有越冬的可能;成虫越冬的可能性较小;幼虫不可能在我省越冬。粘虫迁飞的可能是存在的。在防治策略方面,根据山东省虫粘各代发生特点和现有条件:认为防治第一代粘虫,在作好预测预报的基础上,坚决把幼虫消灭在幼龄阶段;对三代粘虫,可以采取采卵和消灭低龄幼虫相结合的办法。
Mythimna separata in Shandong Province for three generations, some years can occur a small amount of fourth generation larvae. After several years of research, the dominant factor affecting rampant emergence of the first generation of armyworm is the distribution of rainfall and rainfall during the hatching stage of the armyworm. Rainfall affects the survival of newly hatched larvae; it has little effect on egg hatching. The dominant factor that affects the rampant emergence of the third generation of armyworm is the warm-humid conditions from late July to mid-August. During the period, the average temperature of every ten days is below 26 ℃ and the relative humidity is above 80%, which may lead to the occurrence of the third generation of armyworm. Grass shortage is also one of the reasons. According to the survey results over the past few years: It is initially believed that in certain circumstances in the province, a small amount of armyworm pupae may overwinter. Adults are less likely to overwinter. Larvae can not overwinter in our province. The migration of armyworms may be present. In terms of prevention and treatment strategies, according to the occurrence characteristics and current conditions of the pest-sticking generations in Shandong Province, it is considered that prevention and control of the first generation of armyworm pests, based on the prediction and forecast, resolutely eradicates the larvae in the juvenile stage; You can take the method of combining ovum and eradication of young larvae.