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萍丝虫是红萍的主要害虫,在福州地区年繁殖14～15代,危害严重时,亩虫口密度达2000～4000万头,3～4天就能将红萍毁灭.夏季,世代周期为15～18天,田间常表现世代交替.因此,它是红萍越夏及保种的主要障碍.目前,用呋喃丹农药防治,药效日渐下降,对老龄幼虫的杀灭效果更差,所以,急需寻找出高效低毒的农药来替代它.1983～1984年,我们用B.t.i生物农药防治萍丝虫已收到良好效果.
Pigeon filariasis is the main pest of red duckweed in Fuzhou area in the breeding of 14 to 15 generations of serious harm, mus insect population density of 2,000 to 40 million, 3 to 4 days will be able to destroy the red duckweed in summer, the generation of cycles 15 to 18 days, the field often alternate performance generations.Therefore, it is the main obstacle to Hongping summer and seed preservation.Currently, the use of carbofuran pesticide control, efficacy decreased, the killing effect on aging larvae worse, therefore, The urgent need to find a highly efficient and low toxicity of pesticides to replace it from 1983 to 1984, we use Bti biological pesticides to control Pinworm has received good results.