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1 August 2001 Identification of Rice Cultivars Resistant to Lissorhoptrus oryzophilus (Coleoptera: Curculionidae), and Their Use in an Integrated Management Program
Michael J. Stout, William C. Rice, Steven D. Linscombe, Patrick K. Bollich
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Abstract

The rice water weevil, Lissorhoptrus oryzophilus Kuschel, is the most destructive insect pest of rice in the United States and is a particularly severe pest in Louisiana. The current management program for this insect in Louisiana relies heavily on insecticides, most notably the seed treatment fipronil (Icon). Diversification of the management program by incorporation of alternative strategies is needed to improve the effectiveness and long-term stability of the program. In the three experiments reported here, three components of a diversified management program for the rice water weevil in Louisiana—host plant resistance, treatment of seeds with Icon, and the cultural practice of delayed flooding—were investigated. Comparison of the densities of weevil larvae on the roots of several commercial cultivars indicated that the long-grain cultivar ‘Jefferson’ was more resistant to infestation by the rice water weevil than the other cultivars. The medium-grain cultivars ‘Bengal’, ‘Earl’ and ‘Mars’ and the long-grain variety ‘Cocodrie’ were the most susceptible to infestation. Comparison of yield data from untreated plots and plots treated with Icon indicated that the long-grain cultivars Cocodrie, Lemont, and Jefferson were more tolerant of weevil injury than the other cultivars. A 2-wk delay in flooding was associated with yield benefits in plots not treated with Icon. Treatment of seeds with Icon controlled weevils in all three screening experiments. The implications of these results for the development of an integrated management program for the rice water weevil are discussed.

Michael J. Stout, William C. Rice, Steven D. Linscombe, and Patrick K. Bollich "Identification of Rice Cultivars Resistant to Lissorhoptrus oryzophilus (Coleoptera: Curculionidae), and Their Use in an Integrated Management Program," Journal of Economic Entomology 94(4), 963-970, (1 August 2001). https://doi.org/10.1603/0022-0493-94.4.963
Received: 6 October 2000; Accepted: 1 March 2001; Published: 1 August 2001
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KEYWORDS
Cultural practices
host plant resistance
Lissorhoptrus oryzophilus
Oryza sativa
resistance to infestation
tolerance
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