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Comparison of Three Single-Nozzle Operator-Carried Spray Applicators for Whitefly (<i>Bemisia tabaci</i>) Management on Squash

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Agricultural Sciences 2015年第11期6卷 1381-1386页

作者： Alvin M. Simmons Shaaban Abd-Rabou Mohammed Hindy U.S. Vegetable Laboratory United States Department of Agriculture (USDA) Agricultural Research Service Charleston SC USA whiteflies unit Scale Insects and Mealybugs Department Egyptian Ministry of Agriculture and Land Reclamation Agricultural Research Center Plant Protection Research Institute Giza Egypt Spray Technology Research Department Egyptian Ministry of Agriculture and Land Reclamation Agricultural Research Center Plant Protection Research Institute Giza Egypt

whiteflies cause problems in vegetable production on a global scale. The primary worldwide whitefly pest is Bemisia tabaci (Gennadius). Insecticides are commonly used to mitigate the whitefly problem in vegetable crops. In limited-resource crop production, operator-carried spray applicators are commonly used for pesticide treatments. Three single-nozzle operator-carried spray applicators were assessed for their efficacies for whitefly (B. tabaci) control on summer squash (Cucurbita pepo L.) in Egypt. Each knapsack spray equipment was evaluated with five biorational and conventional insecticides. Counts of whitefly nymphs (first, second, third and fourth instars) on leaf samples were taken on 3, 9, 15 and 21 days after treatments with the insecticides. Nymphal mortality varied about 10% among the three spray equipment treatments. The Economy Micro Ulva sprayer resulted in significantly more nymphal mortality as compared with the Arimitsu sprayer and the CZP-3 sprayer, respectively. All insecticides greatly suppressed the whitefly populations;mean mortality ranged from 73% to 95% for all nymphs combined by day for a given treatment. These results provide pest management practitioners with performance assessment of the three operator-carried pesticide applicators for whitefly management with selected foliar insecticides.

关键词： Bemisia tabaci Vegetable Portable Pesticide Applicator Pest Management Limited-Resource Producer

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The omnivorous predator Macrolophus pygmaeus,a good candidate for the control of both greenhouse whitefly and poinsettia thrips on gerbera plants

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Insect Science 2020年第3期27卷 510-518页

作者： Ada Leman Barbara L.Ingegno Luciana Tavella Arne Janssen Gerben J.Messelink Wageningen University&Research Business Unit Greenhouse HorticultureBleiswijkthe Netherlands Dipartimento di Scienze Agrarie Forestall e Alimentari(DISAFA)ULF Entomologia Generate e ApplicataUniversity of TorinoGrugliasco(TO)Italy IBED Department of Evolutionary and Population BiologyUniversity of AmsterdamAmsterdamthe Netherlands

The poinsettia thrips Echinothrips americanus Morgan is a relatively new pest that has spread rapidly worldwide and causes serious damage in both vegetable and ornamental *** this study,we investigated if and how effective this pest can be controlled in gerbera by the omnivorous predator Macrolophus pygmaeus(Rambur).Because herbivores on plants can interact through a shared predator,we also investigated how poinsettia thrips control is affected by the presence of the greenhouse whitefly Trialeurodes vaporariorum(Westwood),a pest that commonly coexists with *** in *** laboratory studies,we found that the predator *** fed on both pests when offered *** tests showed a clear preference of the predators for plants infested by whiteflies but not by *** a greenhouse experiment,densities of both pests on single gerbera plants were reduced to very low levels by the predator,either with both pests present together or ***,predator‐mediated effects between whiteflies and thrips played only a minor *** plant feeding of the shared predator probably reduced the dependence of predator survival and reproduction on the densities of the two pests,thereby weakening potential predator‐mediated ***,*** is a good candidate for biological control of both pests in ***,further research is needed to investigate pest control at larger scales,when the pests can occur on different plants.

关键词： apparent competition biological control Echinothrips americanus pest interactions prey preference Trialeurodes vaporariorum

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