On-Farm Trial Assessing Efficacy of Three Insecticide Classes for Management of Stink Bug and Fruit Damage on Processing Tomatoes
2007
Cullen, Eileen M. | Zalom, Frank G.
Five foliar insecticides representing a neonicotinoid (thiamethoxam), a pyrethroid (lambda-cyhalothrin), a neonicotinoid plus pyrethroid (thiamethoxam and lambda-cyhalothrin), and two organophosphates (dimethoate and methamidophos, respectively) were evaluated for relative efficacy in managing consperse stink bug (Euschistus conspersus Uhler) on California processing tomatoes. E. conspersus density and percentage fruit damage were measured at harvest in an on-farm experiment at two locations in 2002, and small plot experiments in 2002 and 2003. Results showed that thiamethoxam plus lambda-cyhalothrin, lambda-cyhalothrin, and methamidophos can provide equivalent control of E. conspersus on processing tomatoes. Relative efficacy of the same treatments was inconsistent when applied before completion of small nymph development as estimated by the E. conspersus phenology model. Results can be utilized by growers with canning contracts that limit total organophosphate active ingredient per season, or in cases where stink bug treatment thresholds are reached within the processor preharvest interval for organophosphates. Insecticide efficacy evaluation is discussed within the context of continued research to provide IPM-compatible insecticide options to growers facing low processor tolerance for stink bug damaged fruit, and organophosphate insecticide restrictions in tomato canning contracts.
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