異なった寄主より分離されたVerticillium lecaniiのオンシツコナジラミおよびアブラムシ類に対する病原性について

概要

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The pathogenicity of two Verticillium lecanii isolates (MG-VI-18 isolated from whitefly, Trialeurodes vaporariorum, and MG-VI-45 from cotton aphid, Aphis gossypii) was investigated by inoculation experiments. Both MG-VI-18 and MG-VI-45 were pathogenic to T. vaporariorum, A. gossypii and Myzus persicae, but host specificities were observed. MG-VI-18 was more pathogenic to larvae and adults of T. vaporariorum than MG-VI-45. The pathogenic difference was especially noticeable in the larval stage at concentrations of 10^4-10^6 conidia/ml. The pathogenicity of MG-VI-45 was stronger than that of MG-VI-18 to A. gossypii (apterous adults) and M. persicae (apterous and alate adults). The mortalities caused by the two isolates were almost the same (96-100%) at high concentrations (10^7,10^8 conidia/ml), but in the case of MG-VI-18,the time to the death was longer than for other isolates. At lower concentrations (10^6,10^5,10^4 conidia/ml), the mortalities at 9 days post-treatment for MG-VI-45 were higher than those for MG-VI-18. The sizes of conidia and blastospores were different between MG-VI-18 and MG-VI-45. MG-VI-45 produced large conidia and blastospores with dimensions of 8.3×2.5μm (length×width) and 13.1×2.7μm compared to MG-VI-18 with dimensions of 3.4×1.3μm and 5.5×2.7μm, respectively. The mycelial growth of MG-VI-18 was faster than that of MG-VI-45.
日本応用動物昆虫学会の論文
1992-11-25