Evaluation of Damage to Lint and Seed of Cotton Caused by the Pink Bollworm1

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Abstract
Cotton crop value was reduced by 34% when seasonal infestation counts averaged at least 60% of the bolls infested by pink bollworm (Pectinophora gossypiella (Saunders)) in experiments at Brownsville, Texas. At this level of infestation, losses were about equally distributed between reductions in yield and quality of lint and seed. Lower infestations resulted in losses due chiefly to reduced quality of lint and seed. Reductions in staple length, strength, and fineness or immaturity of fiber were directly related to pink bollworm infestation levels. Likewise, losses in yield and quality of seed were related to pink bollworm infestation levels. In artificially infested bolls, the degree of damage was related to age of boll and number of larvae per boll.

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