湘北稻象甲爆发原因调查及防治技术

为了有效防治稻象甲,调查了近年来稻象甲在湘北地区爆发的主要原因,查明了几种药剂对稻象甲的防治效果及其使用技术。调查表明,免耕栽培技术的推广、田间管理粗放等是导致湘北地区稻象甲种群数量快速增长的主要原因。田间药效试验结果表明,氟虫腈、毒死蜱、水胺硫磷等都是防治稻象甲成虫的有效药剂,在成虫高峰期施药,防效在80%以上;在卵孵化高峰期喷施氟虫腈或毒死蜱,防效在95%以上。用毒死蜱防治稻象甲幼虫时,要求排干田间水后施药,防效可达95.3%;田间是否有水对氟虫腈的防效影响不明显。

Investigation of the Causes of the Outbreak of Echinocnemus squameus in the North of Hu'nan Province and Its Control Technology

Based on the on-the-spot investigation,on the main causes of outbreak of E.squameus in the north of Hu'nan Province,the control effects of some pesticides and their applying technology were found out.The result shows that the popularization of light cultivation technology and rough field management are the leading cause of fast increase of Echinocnemus squameus population in these areas.48%Lorsban EC,5%Regent SC and 40%Isocarbophos EC are the effective pesticides to control the adult of E.squameus.The control effect is more than 80% when the pesticides are sprayed in the peak period of the adult of E.squameus;Lorsban EC,Regent sprayed in the peak preiod of hatching ovum,have the effect of more than 95%.When Lorsban sprayed to control the larvae of Echinocnemus squameus,if water in the field can be dried up,the effect will be the best reaching 95.3%;water in the field has no influence on the control effect of Regent.