Abstract
Validation of the cotton simulation model GOSSYM against a commercial crop grown in 1976 at Scott, Mississippi, revealed that a 32% yield loss had occurred due to lygus ( Lygus lineolaris) (Palisot de Beauvois) damage to squares and to fruiting branch development at the eighth and ninth nodes on the plant. Model crops grown under soil and weather conditions at Mississippi State University with various rates of lygus infestation at 0, 11 115, and 22 230 insects per hectare indicate that yield loss due to damage beginning the first week of squaring may be quite variable (7% to 60%) depending on the insect population. The higher insect population delayed crop maturity by two weeks. Simulated yield loss due to damage beginning after the first week of squaring was much less variable averaging about 25%.
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