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Mortality of Tarnished Plant Bug and Boll Weevils to Provado and Different Formulations of Fipronil

W.P. Scott, G.L. Snodgrass, D.A. Adams


The efficacy of four formulations of Fipronil (80 WG, 2.5 EC, 0.73 EC, and 2.5 Gel) at three rates (0.018, 0.025, and 0.038 lb AI/acre) and Vydate (3.77 L at 0.25 lb AI/acre) for tarnished plant bugs, Lygus lineolaris (Palisot de Beauvois) and boll weevils, Anthonomus grandis Boheman, was determined by caging adults of the two species on cotton terminals treated in a spray chamber with the insecticides. All formulations and rates of Fipronil and Vydate were effective against boll weevils producing mortalities of 90% or greater. Fipronil 80 WG and 2.5 EC were the best formulations for plant bug control producing mortalities at rates of 0.025 and 0.038 lb AI/acre that were not significantly different from mortality obtained with Vydate. Two or three applications of Fipronil 80 WG (0.05 lb AI/acre), Fipronil 2.5 EC (0.05 lb AI/acre), Provado 1.6 F (0.047 lb AI/acre) and Curacron 8 E (0.5 lb AI/acre) were needed to control a large insecticide resistant population of plant bugs found in cotton in August. The effectiveness of Fipronil and Provado on plant bugs, along with the fact that each represents a new class of insecticide, will be very useful in early season insect control and in reducing insecticide resistance.

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 987 - 990
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998