【摘要】 通过对晋中盆地夏玉米田棉铃虫发生危害的调查研究 ,结果表明 ,第 3代棉铃虫幼虫是夏玉米生长后期的重要害虫之一 ,该虫主要危害玉米的雄穗和雌穗 ,其危害高峰期在 8月中旬～ 9月上旬 ,通常年份蛀穗率可达 5 9.3%以上。更多还原

【Abstract】 Study on occurrence and harmfulness of\% Heliothis armigera\%(Hübner) in summer-sowing corn field was carried out The result showed thatlarva of \%Heliothis armigera\%(Hübner)of the third generation was an important pest in summer -sowing corn later period The pest damaged mainly corn’s male grain and female grain Its peak was from the middle of August to the former of September The damage rate reached 59 3% average year更多还原