摘要
2003年4～10月,在湖南桃江县的稻鸭共栖田中,对二化螟的发生规律进行了研究.结果表明:每公顷放养体重200～400g鸭子300～450只,能使二化螟幼虫的高峰发生期向后推迟9～14d.中稻放鸭区与空白区对照,第二代二化螟幼虫的发生数量减少53.2%～76.8%:放鸭区二化螟为害株率比空白区降低13.4%～47.1%.晚稻第三代二化螟幼虫发生数量放鸭区比空白区减少61.8%,二化螟为害株率降低62.2%.
From April to October of 2003, the author made a systemic study on the rule of Chilo suppressalis (walker)' shappening in Rice-Duck commensalism field of Taojiang county, Hunan province.The results showed: in every hectare of rice paddy feeding 300 to, 450 ducks, each duck weights from 200 to 400 g, can put off 9 to 14 days for the peak of walker grub's happening. Middle rice duck-fed area compared with blank area, the second generation of chilo suppressalis (walker) grub's happening was reduced by 53.2% to 76.8%; the ratio of damaged individual plant by chilo suppressalis (walker) was lowered by 13.4% to 47.1%. Late rice duck-fed area compared with blank area, the third generation of Chilo suppressalis (walker) grub's happening was reduced by 61.8%, the ratio of damaged individual plant by Chilo suppressalis (walker) was lowered by 62.2%.
出处
《湖南师范大学自然科学学报》
EI
CAS
北大核心
2005年第1期70-74,共5页
Journal of Natural Science of Hunan Normal University
基金
国家863项目(863 306 ZD05 3 E)
国家自然科学基金资助项目(39670142)
湖南省科技厅资助项目(NKY2001 01)
