Effect of Sorghum Webworm on Yield of Grain Sorghum in Oklahoma12

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Abstract
The sorghum webworm, Celama sorghiella (Riley), is a potential threat to sorghum production in Oklahoma, and in years of higher-than-normal precipitation, late plantings may sustain heavy losses. Populations of the pest were regulated experimentally by treatment with doses of mevinphos, and the amount of grain consumed at the different population levels was estimated. Each larva consumed an average of 0.79 g of grain. At an assumed market price of $1.90 per hundredweight and a total treatment cost of $2.50 per acre, a saving of 132 lb of sorghum per acre would just offset the cost of treatment. With an average distance between heads of 8 inches and a row spacing of 40 inches, a population level of approximately 5 larvae per head should justify treatment.

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