Laborzucht von Typhlodromus pyri und Auswirkungen von Pflanzenschutzmitteln auf Mortalitaet und Fekunditaet dieser Milbe.
1988
Englert W.D. | Maixner M.
Typhlodromus pyri was reared in the laboratory and fed by pollen. Feeding the mites with different pollen influenced the egg-laying-capacity. Pollen of Papilionaceae, Helianthus tuberosus and Tulipa sp. gave best results. Glass plates were treated with six insecticides and one acaricide and dried. Nymphs of T. pyri were transfered and mortality was determined after one week, egg-laying was observed during a second week. The less toxic agents were Parathion and Fenbutationoxid, which caused mortality values between 2 per cent and 13 per cent. Methidathion and Fenvalerat killed all mites within 24 hours respectively 8 hours. The LC50 values for Parathion ranged between the two fold and the four fold concentration recommended for field application. Fecundity was decreased by all agents accept Parathion.
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