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对含有不同发育阶段根结线虫(Meloidogyne incognita)的黄瓜根部用氨基乙二酰(Oxample)(6·25μg/ml土壤水)进行处理。在降低可发育成雌虫的幼虫比例方面以在二龄幼虫侵入后马上用药比较晚用药时(三至四龄幼虫侵入时),效果更佳。早期用氨基乙二酰处理还显著降低具卵块的雌虫比例,而晚期用药无此效果。不过,每卵块的卵粒数及幼雌成虫的个体大小都在各施药处理后显著减少和减小——处理越早,作用愈大。这些结果表明,取食频繁的根结线虫二龄幼虫比不取食的三,四龄幼虫对内吸杀线虫剂更为敏感。
Cucumber roots containing Meloidogyne incognita at different developmental stages were treated with Oxample (6.25 μg / ml soil water). In reducing the proportion of larvae that may develop into females, it is more effective when the second-instar larvae are administered immediately after the larvae are ingested rather late (when third- to fourth-instar larvae invade). Early treatment with amino-oxalyl also significantly reduced the proportion of females with egg masses, whereas late treatment did not. However, the number of eggs per egg and the individual size of juvenile adults were significantly reduced and decreased after each treatment - the earlier the treatment, the greater the effect. These results indicate that second instar root-knot nematode larvae, which are frequently eaten, are more susceptible to nematicidal insecticides than third- and fourth-instar larvae that do not consume food.