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通过对大螟田间分布规律的调查分析,明确了大螟的趋边集中为害行为。幼虫侵入水稻方式以从剑叶叶鞘缝侵入和从剑叶叶鞘处咬孔侵入为主。幼虫为害水稻造成白穗,随为害茎节的升高而加重,以穗茎节为主,占80%左右,其次是穗茎下第一节。一至四龄幼虫为害均能造成水稻白穗,以二龄为害造成白穗为主,平均为86.7%。据此提出了大螟的测报调查方法,防治时期应在水稻破口期和卵孵高峰期,以及轻发年份田边挑治、重发年份全田用药的防治策略。
Through the investigation and analysis of the distribution pattern in the field of Sesamia inferens, it is clear that the concentration of Sesamia inferens is concentrated. The larva invaded rice way in order to invade from the blade of the leaf sheath of the sword leaf and invade into the bite hole mainly from the leaf sheath of the flag leaf. Rice caused by larvae white spike, with the increase of stalks increased aggravating, with ear stem section, accounting for about 80%, followed by the first section under the spike stems. First to fourth instar larvae can cause rice white spike, two spikes caused by white spike, with an average of 86.7%. Based on this, the report of investigation method of Sesamia inferens was put forward. The prevention and treatment should be at the breach of the paddy and the peak period of egg hatching, as well as the prevention and treatment strategies of field treatment in the light years and repeated years.