ABSTRACT
Selected commercial cotton (Gossypuim hirsutum L.) fields in Tensas parish were monitored for insect purposes from 1982 to 1990. Fields were scouted and insect control records were maintained from planting until crop termination and yields were recorded. Regression analyses were conducted to determine if significant linear relationships existed between various combinations of these insect control and production variables. Only two relationships were found to be significant (p< 0.05). The total number of bollworm, Helicoverpa zea (Boddie) , and tobacco budworm, Heliothis virescens (F.), applications per season increased as the date of the last bollworm and tobacco budworm application extended later in the season (r2 = 0.53). Also, a later initiation date for bollworm and tobacco budworm control resulted in a later termination date of bollworm and tobacco budworm control in late season (r2 = 0.50). Among the numerous regressions that were not found to be significant, there was no relationship between the total cost of insect control or the total number of bollworm and tobacco budworm applications and yield.
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