Variation in susceptibility of rice lines to infestation by the rice water weevil (Coleoptera: Curculionidae)

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The rice water weevil, Lissorhoptrus oryzophilus Kuschel, is an important insect pest of rice in the United States and Asia. Current management programs for this pest rely heavily on insecticides. Host plant resistance is an underused strategy for management of this pest. In the experiments reported here, the susceptibilities of 19 rice lines to infestation by the rice water weevil were evaluated in greenhouse experiments. The lines screened in this study had exhibited either resistance or susceptibility (relative to commercial varieties) in previous field screening experiments. Thus, the purpose of these experiments was to confirm the presence of resistance/ susceptibility in these lines and to assess variation in susceptibility relative to two commercial varieties. Both choice and no-choice experiments were conducted. The experiments were designed primarily to detect antixenosis. Rice lines screened in these experiments exhibited significant variation in their susceptibilities to infestation by L. oryzophilus. Some of the lines consistently supported fewer weevil eggs and larvae than commercial varieties, whereas others consistently supported more eggs and larvae than commercial varieties. The lines exhibiting resistance (PI 319512, PI 321310, PI 321264, and PI 321278) had also exhibited resistance in at least four prior field experiments, and may be useful as germplasm in a breeding program. The identification of lines possessing both resistance and susceptibility may facilitate the characterization of biochemical or morphological mechanisms of resistance to the rice water weevil in these lines.

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Journal of Agricultural and Urban Entomology

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