Sub-lethal Effects of Avermectin to Blattisocius dolichus (Acari: Aceosejidae) and Control Efficacy of Different Release Modes of B. dolichu against Root-knot Nematode

doi:10.16409/j.cnki.2095-039x.2018.06.003

Abstract

Abstract: In this research, the effects of sub-lethal doses of avermectin on the survival, reproductive development and predation ability of Blattisocius dolichus were measured, and the control efficacy of different release modes of B. dolichus against root-knot nematode disease were also studied in the potted Iponoea aqatica. Three sub-lethal doses, i.e. LC₅₀, LC₃₀ and LC₁₀, against B. dolichus, were 2082, 3760 and 8831 folds dilution of 2% avermectin, respectively. All sub-lethal doses of avermectin obviously inhibited the survival, fecundity and predation of the mites. B. dolichus treated with three sub-lethal doses survived from juvenile mites to adult mites at 32.0%, 46.0% and 72.0% of the control, respectively. The treated mites showed fecundity of 6.23%, 17.58% and 34.24% of the control, respectively, and predation ability of 34.70%, 53.06% and 62.59% of the control, respectively. However, the treatment did not decrease egg hatching rate. Slow release and direct release of B. dolichus reduced the numbers of root-knots and nematode egg masses on the roots of water spinach, and effectively inhibited the occurrence of root-knot disease. Thirty days post treatments, the number of root-knots and nematode egg masses were 28.97% and 64.38%, 49.97% and 74.43%, 81.92% and 92.24%, and 80.15% and 92.69% less in the treatments of direct release of the mite, slow release of the mite, combined application of the mite and avermectin, and single application of avermectin than those in the control, respectively. Therefore, the control efficacy of slow release of B. dolichus is much better than that of direct release, and the combination of avermectin and B. dolichus shows no synergistic effects in control of root-knot nematodes.

Key words: Blattisocius dolichus, avermectin, sublethal effects, root-knot nematodes, release methods

CLC Number:

S476

LI Man, WANG Wenchao, XU Chunling, YANG Sihua, CHEN Chun, XIE Hui. Sub-lethal Effects of Avermectin to Blattisocius dolichus (Acari: Aceosejidae) and Control Efficacy of Different Release Modes of B. dolichu against Root-knot Nematode[J]. journal1, 2018, 34(6): 818-824.

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