Fourth International Bemisia Workshop International Whitefly Genomics Workshop
Oberon® 2SC: A New Resistant Management Tool for Whitefly Control in Vegetables
1 Bayer CropScience, Brandon, FL., USA. Correspondence: marco.toapanta@bayercropscience.com
2 Gulf Coast Research and Education Center, University of Florida, Wimauma, FL., USA
3 Bayer CropScience, Research Triangle Park, NC., USA;
4 Bayer CropScience, Monheim, Germany
Oberon® contains a novel insecticidal and acaricidal active ingredient, spiromesifen, from the new chemical class of spirocyclic tetronic acids, generally known as keto-enols. This new compound is effective against all developmental stages of whiteflies (Bemisia spp and Trialeurodes spp), mites, and other pests, through a new mode of action (MOA), inhibition of lipid biosynthesis. It is listed in the IRAC-International Mode-of-Action classification as, MOA Group 23, a lipid biosynthesis inhibitor, together with spirodiclofen. In field tests conducted between 2000 and 2005 in Florida, Oberon, as a 240 g AI/liter suspension concentrate (SC) formulation, applied in different vegetable cropping systems at rates ranging from 100 to 150 g AI/ha, provided significantly greater control of B. tabaci biotype B nymphs than conventional insecticides. In addition, foliar applications of Oberon resulted in longer residual control than commercial insecticides including the juvenile hormone mimic, pyriproxyfen and the chitin synthesis inhibitor, buprofezin. Baseline susceptibility tests conducted in 2005 with 2nd instars of B. tabaci biotype B collected from tomato-growing areas in west-central Florida showed LC50 values ranging from 0.27 to 0.85 mg liter−1, with the former value corresponding to the laboratory susceptible colony. The values found here are within a range of values obtained elsewhere for B. tabaci biotype B and Q populations including neonicotinoid and pyriproxyfen resistant strains. Monitoring tests conducted in 2006 with 2nd instars of B. tabaci biotype B collected from tomato-growing areas in west-central and southwest Florida, which received Oberon applications during the growing season, resulted in LC50 values below the values obtained in the baseline tests, thus confirming full susceptibility of B. tabaci to field applications of Oberon. Moreover, Oberon showed no cross-resistance to other commercial insecticides applied to control whiteflies, thus representing a new valuable tool in whitefly resistance management, in combination or rotation with other insecticides, such as Admire Pro Systemic Protectant, a MOA Group 4A.
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