Abstract
Several different measures of defoliation have been used in pest management to predict yield losses and potential yield, including leaf area removed, percentage of defoliation, and remaining leaf area. Plots were defoliated at 4 rates from R2 to R5, with the effects of drought stress also tested. Differences in precision of yield and yield-loss estimates based on remaining leaf area and leaf area removed were examined. Leaf area removed did not predict yield as well as did remaining leaf area, especially when data were pooled over irrigation rate. However, data expressed as remaining leaf area have limited pest management applications unless these data can be coupled with additional information, such as initial canopy size, pest population density, or predictions of future injury.
Published Version
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