论文部分内容阅读
黑龙港地处河北东南部平原,境内多港泊洼淀,地势低,易于沥涝成灾。种植的作物以小麦、杂粮为主。其生态条件适于小地老虎发生,成为我国小地老虎严重发生区之一。尤其近年来生态条件的不断变化,小地老虎的发生消长也日趋复杂。 防治适期是关键问题。过去提出以蛾、卵、幼虫龄期、作物苗龄作为防治适期的指标,但在应用上不易掌握,为此重点研究了一代幼虫虫源组成和蛾、卵关系。 1 越冬代蛾峰与发生程度关系 黑龙港地区小地老虎不能越冬,一代虫源均由外地分批迁入,一般情况成虫迁入时
Heilongjiang Province is located in southeastern Hebei plains, the territory of more Hong Kong Lake depression, low topography, easy to flood disaster. Crops to wheat, cereals-based. Its ecological conditions suitable for the occurrence of small tiger, becoming one of the serious occurrence of small tiger in our country. In particular, the changing ecological conditions in recent years, the occurrence of small tigers have become increasingly complex. Preventive fitness is the key issue. In the past, moths, eggs, larvae and seedling age were proposed as indicators for controlling the appropriate period, but their applications were not easy to grasp. Therefore, the relationship between the insect source composition and the moths and eggs of the first generation larvae was studied. 1 overwintering moth peak and the occurrence of relationship Heilonggang area tiger can not be overwintered, a generation of insect sources are moved in batches by the field, the general situation when the immigrants