稻水象甲田间种群动态及化学控制技术

稻水象甲在福建省霞浦县长春镇田间种群发生动态的调查结果表明:5月中旬是稻水象甲越冬代成虫迁入稻田为害高峰期,5月下旬成虫种群数量迅速降低,并有少量幼虫开始为害水稻根部;6月初是幼虫发生为害高峰期,蛹高峰期出现在6月中旬,并开始有一代成虫羽化。药剂筛选试验结果表明:20%丁硫克百威乳油、48%毒死蜱乳油、40%三唑磷乳油、5%锐劲特悬浮剂对稻水象甲成虫具有良好的田间控制效果,药后7d防效均在92.31%—100%;5%丁硫克百威颗粒剂、15%乐斯本颗粒剂、3%呋喃丹颗粒剂施药后7d对稻水象甲幼虫的防效90.03%—93.56%。化学综合防治示范区水稻分蘖数和株高均显著大于对照区。

Population dynamics and chemical control of rice water weevil, Lissorhoptrus oryzophilus

The results indicated that the middle ten days of May is the fastigium of rice water weevil Lissorhoptrus oryzophilus Kusche immigrated in rice fields.But the population of adult decreased sharply during the last-ten days in May,and there are a few larva of the pest grnawed in the rice root during the period.The fastigium of larva occurred during the forepart in June,but the pupa did in the middle ten days of June.The first generation of adult emergenced during the middle ten days of June.The insecticides of carbo- sulfan 20% EC,chlorpyrifos 48% EC,triazophos 40% EC,fipronil 5% SC,exerted excellent control effects on the adult of rice water weevil.And the carbosulfan 5% GR,chlorpyrifos 15% GR,earbofuran 3% GR also did so on the larva.Compared with the CK,there were more tiller numbers and plant height of rice in the integrated chemical control paddy fields.