矢尖蚧全年一次性药剂防治试验

Studies on the Control of Arrowhead Scale, Unaspis yanonensis (Kuwana), with One Spraying a Year

在矢尖蚧雌成蚧的不同发育阶段、柑桔不同物候期以及不同气候条件下,探讨实施该虫全年一次性药剂防治时,矿物油制剂与有机磷农药混用的适宜配方和喷布时期。结果表明,其最佳配方(体积比)是:40％氧化乐果乳油或40％水胺硫磷:95％机油乳剂:清水=1:60 :3000。混配药液中基础物质机油乳剂的浓度必须保持在2％以上,而有机磷农药则可稀释3000倍。初步探明的最佳喷药时期是:矢尖蚧越冬代雌成蚧次年产卵末期,亦即当年第1代幼蚧虫口发生后峰期至终见期或第2代幼蚧发生的初期,也是柑桔第2次生理落果后期至果实膨大初期,一般正处于梅雨季节接近结束、高温干旱季节来临前,此时喷药能有效阻止幼蚧上果危害。较佳喷药时期为该虫越冬期,即采果后的11～12月,一般正值花芽分化前期,此时温度低湿度高,使用安全。

The optimum insecticide proportion and spraying periods to control arrowhead scale, Unaspis yanonensis (Kuwana), with one spraying a year were studied in this paper. The results show that with the 1: 60: 3000 proportion of Omethoate 40 EC or Optumal 40 EC, machine oil 95 EC and water respectively, and spraying in the late stage of larval occurence of first generation or in the early of the second generation larval occurence viz. from the late of the June drop to the starting of fruitlet development, ideal control result can be obtained.