检疫害虫美国白蛾生物学特性的研究

美国白蛾是世界性检疫害虫 ,1998年后传入安徽省芜湖市 ,通过几年的适应而发生化性的变化 ,由每年发生 2代发展到现在以 3代为主 ;均以蛹在树洞、干基皮缝、落叶石块、土中及附近建筑物缝角等处越冬 ,翌年 4月下旬 1、2代蛹同步相继羽化。第 1代成虫 6月下旬羽化 ,第 2代蛹大部分于 8月下旬羽化进入 3代 ,一部分滞育越冬。此虫无论何种虫态 ,均可随人为活动传播扩散 ,繁殖快 ,可危害多种农、林植物 ,必须严防

Biological Characteristics of Hyphantria Cunnea

Hyphantria cunnea,a quarantine pest all over the world, was disseminated into Wuhu city in about 1998. It bred 2 generations a year at first, and 3 generations a year later because of its adaptation to new surroundings. The pest lived through the winter as pupa in tree holes, trunk rifts, soil and crack of surrounding buildings. The emergence of the first and second generational pupa in the winter occurred during the last ten-day period of the April in the next year in succession. The first generation adult occurred during the last ten-day period of the June. The most of pupa from the second generation conducted emergence during the last ten-day of the August, but some of the pupa lived through the winter. It is very important to take strict precautions against the pest because of its high breeding rate, quick spreading speed in any conditions with human activities and its harming to many kinds of plants.