哒螨灵对三种害虫的毒力比较及其应用潜力评价

为明确杀螨剂哒螨灵对B型烟粉虱、水稻灰飞虱和黄曲条跳甲等3种害虫的毒力和扩大其使用范围,采用玻管药膜法测定了哒螨灵等药剂对B型烟粉虱和水稻灰飞虱成虫的毒力,用浸渍法测定了哒螨灵等对B型烟粉虱若虫和黄曲条跳甲的毒力.结果显示,哒螨灵对烟粉虱成虫和水稻灰飞虱成虫的毒力最高,触杀LC50分别为0.952 mg/L和0.252 mg/L;哒螨灵对B型烟粉虱若虫的触杀LC50为43.148 mg/L,其毒力较啶虫眯和吡虫啉低,与烯啶虫胺毒力相当,但较吡丙醚毒力高近1倍;哒螨灵对黄曲条跳甲的LC50为195.123 mg/L,其毒力低于毒死蜱,但高于啶虫脒和吡虫啉.表明哒螨灵不仅对B型烟粉虱和水稻灰飞虱成虫毒力高,对烟粉虱若虫和黄曲条跳甲的毒力也较高,有进一步开发应用的潜力.

The toxicity comparison and application evaluation of pyridaben to three insect pest

In order to extend the application scope of pyridaben, the toxicity of pyridaben to Bemisia tabaci biotype B, Laodelphax striatellus and Phyllotreta striolata were detected using the residual film and immersion methods. The results showed that pyridaben had higher toxicity than the other pesticides to adults of B.tabaci biotype B and P.striolata with LC₅₀ 0.952 mg/L and 0.252 mg/L, respectively. The LC₅₀ of pyridaben to nymphs of B.tabaci biotype B was 43.148 mg/L, the toxicity of which was lower than those of acetamiprid and imidacloprid, as high as nitenpyram, but higher than pyriproxyfen nearly one time. The LC₅₀ of pyridaben to L.striatellus was 195.123 mg/L, which was lower than that of chlorpyrifos, but was higher than those of acetamiprid and imidacloprid. The results showed that pyridaben had high toxicity to adults of B.tabaci biotype B and L.striatellus, to nymphs of B.tabaci and P.striolata as well. The results indicated that pyridaben was worthy to be further studied and developed.