The rice water weevil, Lissorhoptrus oryzophilus Kuschel, is the most widely distributed and destructive insect pest of rice, Oryza sativa L., in the United States. The objective of this study was to determine overall damage levels of rice water weevils in Florida rice fields. Fifty rice fields were sampled over 2 yr for adult foliar damage. These damage data were used as the criteria for determining when control measures are justified. Although the weevils were widespread in Florida rice fields, damage levels at which control is required occurred in only 2% of fields sampled. An increase in adult feeding damage was observed as the rice season progressed. And, there was a significant correlation of feeding damage among fields within a paddy. These data suggest that Florida rice growers may not have to sample all fields in a paddy to estimate weevil damage in the paddy.
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Vol. 51 • No. 3