Chemical control of the greenhouse whitefly, Trialeurodes Vaporariorum (Westwood) on Pelargonium Grandiflorum
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Author: Donyo Ganchev, Daniela Atanasova, Petja Marinova, Neyko Stoyanov, Rumyana Prodanova, Marin Marinov
The greenhouse whitefly Trialeurodes vaporariorum (Westwood) is an important polyphagous pest on various crops, which damages vegetables and flower plants. The efficacy of some synthetic compounds: cyclohexanespiro-5-hydantoin, cyclopentanespiro-5-(2,4-dithiohydantoin), 4-(2-hydroxyethylimino)-cyclopentane-spiro-5-(2-thiohydantoin), cyclopentanespiro-5-(2-thiohydantoin) and 1-amino-cyclopentanecarboxylic acid in the control of second larval instars of the tested pest was investigated under laboratory conditions. The structures of the compounds used were proven through physicochemical parameters, IR and NMR spectral data. It was found that the 4-(2-hydroxyethylimino)-cyclopentanespiro-5-(2-thiohydantoin) manifests strong effectiveness towards the tested pest. The mortality percentage of the larvae was calculated with the Abbott’s formula and statistically analyzed by R language for Statistical Computing, drc package for Dose-Response evaluation.

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