Potential of Entomopathogenic Nematodes as Bio-Control Agents of Sweet Potato Weevil, <I>Cylas formicarius</I> (FABRICIUS)(Coleoptera: Brenthidae)
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概要
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In this study, the efficacy of two entomopathogenic nematodes species against the potato weevil, <I>Cylas formicarius</I>, a serious pest of sweet potato in Sri Lanka was evaluated. In the laboratory, <I>Heterorhabditis megidis</I> produced 80-90% mortality of larvae, pupae and adults while <I>Steinernema feltiae</I> produced 70-80% mortality. In a small plot experiment under field conditions also showed significant insecticidal efficacy on the weevil thereby reducing damage to local sweet potato varieties, CARI-426, CARI-426-13. Although carbofuran gave a considable reduction in damage by the weevil, the degree of control was significantly less than those of two nematode species. A field experiment conducted in large pots with thevariety, Wariyapola Red, showed low levels of weevil control due to <I>S. feltiae</I> or carbofuran. However, <I>H. megidis</I> produced significantly higher levels of weevil control than <I>S. feltiae</I> or the chemical. Results of the experiments on potential of two entomopathogenic nematode species showed a possibility of biological control measure against sweet potato weevil in Sri Lanka.
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日本線虫学会 | 論文
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