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本文概述了2012年二点委夜蛾在黄淮海夏玉米区呈成虫发生量大、幼虫密度小、为害程度低的特点。分析了关键时期对二点委夜蛾不利的天气条件、人为因素恶化其生境、玉米苗期与其幼虫发生期吻合度差是2012年二点委夜蛾偏轻发生的主要原因。
This article summarizes that in 2012, the second instar litura in the Huang-Huai-Hai summer maize area was large-scale occurrence of adult larvae with low density and low degree of harm. In the critical period, the adverse weather conditions were not observed in the armyworm, and anthropogenic factors deteriorated the habitat. The difference between the maize seedling stage and the larval stage was the main reason for the lightness of the armyworm in 2012.