冬闲田深水灌溉放养群鸭控制二化螟越冬基数及其为害研究

Study on effects of raising duck in fallow rice fields with deep water against bollworm in winter

通过大田调查和试验表明,冬闲田春季深水灌溉放养群鸭,20d后对二化螟越冬基数的校正减退率达82.8%,对其1代为害的保苗效果达74.4%,对其2代为害的保穗效果达74.6%。表明该项措施可有效降低螟虫越冬基数和后期螟虫的发生为害。

Field investigation and experiments indicated that raising duck in f allow rice fields with deep water in winter had good control effects on Chilo su ppressalis, 82 8%of over-winter Chilo suppressalis were drowned or eaten by d ucks after 20 days, 74 4%seedlings damaged by the first generation of Chilo su ppressalis were avoided, and 74 6%by the second generation.