地膜覆盖对棉铃虫羽化的影响初探

Preliminary Study on the Effects of Plastic Film Mulching on the Emergence of Helicoverpa armigera

地膜在中国特别是西北干旱地区棉花等农田长期、广泛使用。采用埋蛹腹膜罩笼法,研究地膜覆盖对棉铃虫蛹的羽化以及出土的影响。结果发现:①地膜对棉铃虫成虫的阻隔率与地膜覆盖率之间存在线性关系,模型为y=0.977x-7.233(x为地膜覆盖率,y为成虫阻隔率;R2=0.839,P<0.001);②75%地膜覆盖率可导致棉铃虫羽化成虫64%的死亡率。试验证明,地膜可以有效阻隔棉铃虫成虫出土后的正常活动。

Plastic film has been widely used in various crop fields in China especially in Xinjiang,the largest cotton producer in this country for more than three decades.Cotton bollworm Helicoverpa armigera（Hübner） is one of the major cotton pests.In this article,we preliminarily studied the effects of plastic film mulching on the emergence of H.armigera by investigating the proportion of emerging adults under plastic film with different mulching rates.Our results show that the normal activity of emerged adults can be effectively obstructed by plastic film.There is a linear relationship between the proportion of obstructed adults（y） and the mulching rate of plastic film（x）：y = 0.977 x-7.233（R2 = 0.839,P 0.001）.Particularly,75% of plastic film mulching can lead to 64% of emerged adult deaths.These indicate that plastic film may play an important role in the chronic decline of H.armigera population density in Xinjiang in the past decades.