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Pink bollworm: effects of early maturing, narrow row cotton, insecticides, and chemical termination on seasonal infestations and overwintering larvae
- Bariola, L.A., Henneberry, T.J., Walhood, V.T., Brown, C.
- Southwestern entomologist 1984 v.9 no.1 pp. 62
- Pectinophora gossypiella, application timing, bolls, chemical treatment, chlorflurenol, cotton, crop yield, cultivars, diapause, dicamba, insecticides, irrigation, larvae, overwintering, pesticide application, production technology, row spacing
- Early irrigation cut-off of cotton (July 23) in narrow row (51 cm) spacing prevented the development of any diapause pink bollworm, Pectinophora gossypiella (Saunders), larvae. However, yields were reduced when compared to a full-season production system with conventional (102 cm) row spacing. Insecticide applications were essential in conventional row spaced, full-season cotton to prevent loss from late-season pink bollworm infestations and attain maximum yields within the experimental conditions. The numbers of diapausing larvae and green bolls in non-insecticide treated plots were reduced more than 90% by chemical termination with dicamba plus chlorflurenol or Pennwalt TD-1123 (3,4-dichloroisothiazole 5-carboxylic acid) plus chlorflurenol. There were few diapausing larvae in the insecticide treated plots with no differences due to chemical termination or cultivar. Chemical termination treatments resulted in reduced cotton yields in full-season cotton systems; however, this effect may be minimized by optimum timing of the application.