Cotton aphid response to nitrogen fertility in dryland cotton

Cotton aphid, Aphis gossypii Glover, response to nitrogen fertility and planting date was investigated at the Texas Agricultural Experiment Station at Chillicothe in 1992-1994. Nitrogen was applied at 0, 32, 62, and 88 lb./acre just prior to planting cotton in late April, late May, and late June. Aphid density and percentage leaf nitrogen were estimated once a week in top- and bottom-half leaves. There was a significant, positive linear correlation between aphid density and fertility level in the late May planting date only. In multiple regression analyses, planting date was the most important variable affecting aphid density during August. Nitrogen fertility levels of 62-88, 32-62, and 0-32 lb/acre are recommended for cotton planted in late April, late May, and late June, respectively; these levels provided acceptable yields in each planting date without increasing severity of cotton aphid infestations.

Cotton aphid response to nitrogen fertility in dryland cotton Academic Article