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When Does Brown Stink Bug, Euschistus servus (Say), Begin to Injure Cotton?

M.M. Willrich, D.R. Cook, J.H. Temple, B.R. Leonard, and J. Gore

ABSTRACT

Field studies were conducted to determine the impact of brown stink bug, Euschistus servus (Say), infestations on pre-flowering and flowering cotton plants. Cotton seedlings (pre-squaring), cotton with a small (match-head) square, large (pre-candle) squares, and bolls were infested with one adult brown stink bug in a no-choice test. There were no significant differences in plant height, height to node ratio, square retention, and flower initiation for seedling cotton plants or cotton plants with a match-head square between infested and non-infested treatments for pre-flowering studies. There were no significant differences in abscission of large squares or bolls for infested and non-infested treatments. In boll infestation studies, the relationship between boll maturity, as determined by heat units beyond anthesis, and boll growth, abscission, and seedcotton yield was measured. Boll growth was significantly lower for bolls infested with brown stink bug through 266.5 heat units beyond anthesis. Brown stink bugs induced boll abscission through ca. 350 heat units beyond anthesis. Seedcotton yield was significantly reduced for infested bolls as compared to non-infested bolls through ca. 550 heat units beyond anthesis.





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Document last modified April 16, 2003