リンゴに寄生するリンゴミドリアブラムシとワタアブラムシに対する各種薬剤の影響
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概要
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Among seven aphid species recorded from apple trees in the Aomori Prefect ure, only <I>Aphis spiraecola</I> PATCH has predominated on the summer growth shoots.Recently, however, <I>Ovatus malicolens</I> (HORD) also increased its abundance in manyorchards. Although distribution of <I>Aphis gossypii</I>. GLOVER was still sporadical, its densities in the colonized orchards have become considerably. high. For thecontrol of apple aphids, vamidothion and ESP have been recommended in theprefecture: However, the present field experiments showed that both the chemicalswere effective only for control of <I>A. spiraecola</I>, and not so effective for <I>O.malicolens</I> and <I>A. gossypii</I>. Among the chemicalstested here, those effectivefor <I>O. malicolens</I> were fenvalelate+fenitrothion and permethrin, and those for<I>A. gossypii</I> were permethrin, DMTP, salithion and nicotine sulfate.
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