摘要
本文在简述我国黄河流域棉区1992年棉铃虫大暴发的概况后,较为详细地分析了大暴发的原因。指出生境、食料、天敌、气象及人工防治五方面因素的影响作用,特别强调食料和防治因素的重要意义。认为近年来棉铃虫食料种类增多、数量增大、质量提高、提供时间延长、取食更加方便是该害虫大暴发的基本原因。恰遇适宜的气象条件和人工防治不力(害虫抗药性强、治虫整体水平下降、夏玉米等晚秋作物弃治),终使棉铃虫建立起空前庞大的种群。
The authors give a brief description of an unparalleled outbreak of Heliothis armigera(Hubner)in North China in 1992 and a detailed analysis of the possible causes.Thechanges in the habitat,food,natural enemy,weather and insect control,especially foodand insect control are related to the outbreak.It is believed that the increased crop num-ber,higher yield and quality,prolongated food supply time and more-convinent feedingswitch formed the basis of outbreak.The pest population reached the highest recorded levelwhen a favorable weather and a decreased control efficiency were met.
出处
《自然灾害学报》
CSCD
1993年第2期20-26,共7页
Journal of Natural Disasters
关键词
棉铃虫
暴发
原因
虫灾
Heliothis
Outbreak
Causes
Insect disaster
