![]() ![]() Sweetpotato whiteflies also produce honeydew, which is an excellent substrate for the growth of black sooty mold ( Byrne and Bellows, 1991). Their presence is objectionable to consumers, and the removal of a large amount of sap and nutrients by a large population can also retard the growth of poinsettia ( Wang et al., 2017). Whiteflies (Aleyrodidae), particularly sweetpotato whitefly ( Bemisia tabaci), are the most economically important arthropod pests of poinsettia ( Martin and Mound, 2007 Perring et al., 2018). Department of Agriculture, National Agricultural Statistics Service, 2019). ![]() In 2019, 1193 operations produced close to 47 million pots that valued nearly $216 million in the United States ( U.S. Poinsettia ( Euphorbia pulcherrima) is a major floricultural crop in North America. Keywords: Bemisia tabaci Euphorbia pulcherrima, floriculture foliar spray substrate drench Although less effective than cyantraniliprole, foliar sprays of afidopyropen, chloratraniliprole, cyclaniliprole, flonicamid, flupyradifurone, pyrifluquinazon, spirotetramat, and sulfoxaflor + spinetoram were also effective against nymphs and could serve as partners in an insecticide rotation program. Among the neonicotinoid alternatives, cyantraniliprole was the most effective insecticide in reducing sweetpotato whitefly nymph densities by both spray and drench application methods, with efficacy comparable to those of imidacloprid and dinotefuran. Spray and drench applications of imidacloprid and dinotefuran were consistently the most effective against sweetpotato whitefly nymphs and adults. Results showed that insecticides varied greatly in their efficacy, particularly against adults, and that spray application provided more effective suppression of nymphs than drench application. Sweetpotato whitefly nymph and adult densities were examined 2 weeks before the first application (pretreatment), and weekly after the application for 8 weeks. This study compared the efficacies of 10 systemic and translaminar alternative insecticides with those of two systemic neonicotinoids, when all products were applied as foliar spray (twice at 14 d) or substrate drench (once) against sweetpotato whiteflies on poinsettia plants. Although several systemic and translaminar insecticides have been suggested as alternatives to neonicotinoids, no published study has simultaneously compared their efficacies against sweetpotato whiteflies. Growers are seeking insecticide alternatives to neonicotinoids due to market demands. Management of sweetpotato whitefly ( Bemisia tabaci), one of the most economically important pests of poinsettia ( Euphorbia pulcherrima), relies heavily on neonicotinoid insecticides.
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