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Management Decisions for Stink Bugs

J. K. Greene, G. A. Herzog and P. M. Roberts


 
ABSTRACT

Because stink bugs can be difficult to detect in cotton with traditional sampling tools, we examined other methods of monitoring the pest complex for management decisions. Trapping stink bugs in pheromone traps could prove useful in making timely management decisions concerning their control in cotton. The brown stink bug (BSB), Euschistus servus (Say), and Euschistus spp. were successfully lured and captured during the 2000 season, but potential for successful pheromone trapping of stink bugs remains contingent upon development of lures for other important species. Action thresholds for stink bugs, based on monitoring internal boll damage caused by their feeding, were tested, and treatment at 20% injury to 14-dold bolls adequately protected yields. The ability of bugs to damage cotton decreased as bolls aged, and 25-d-old bolls were not significantly damaged in terms of yield. Feeding by large immature stages (3 rd -5 th instars) and adults of the southern green stink bug (SGSB), Nezara viridula (L.), on individual, half-grown bolls caused significant yield loss. In laboratory bioassays, dicrotophos (Bidrin), a standard organophosphate used for control of bug pests, provided excellent control (96-100% mortality) of laboratory-reared 5 th instars and field-collected adults of SGSB and BSB, remained efficacious at a reduced rate of 0.25 lb [AI]/A (4 oz/A), and is relatively inexpensive. Zetacypermethrin (Fury), cypermenthrin (Ammo), bifenthrin (Capture),and cyfluthrin (Baythroid), standard pyrethroids used for control of worm pests, provided good/excellent control of SGSB but poor/fair control of BSB, confirming field reports of pyrethroid failures with control of BSB. Comparatively, Capture and Orthene were more effective on BSB than on SGSB and could be alternatives to Bidrin in controlling this species if necessary. Some of the emerging materials that target lepidopterous insects demonstrated minimal suppression of pentatomids. Indoxacarb (Steward), emamectin benzoate (Denim), and spinosad (Tracer) did not offer substantial control of field-collected adults of either SGSB or BSB, but Denim appeared to have limited activity against laboratory-reared 5 th instars of both species.





Reprinted from Proceedings of the 2001 Beltwide Cotton Conferences pp. 913 - 917
©National Cotton Council, Memphis TN

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Document last modified XXXXXX, XXX XX 2001