Controlling aphids in iceberg lettuce by pelleting the seeds with insecticides
1999
Ester, A. (Applied Research for Arable Farming and Field Production of Vegetables, Lelystad (Netherlands)) | Brantjes, N.B.M.
Field experiments were carried out in 1993 and 1994 to investigate the efficacy of various insecticides in the controlling of aphids in iceberg lettuce (Lactuca sativa L.). The insecticides were applied in pelleted seeds. Plants were raised in peat blocks as is the standard practice of commercial plant raisers in the Netherlands. We applied, oxamyl at rates up to 50 g; vamidiothion at rates up to 125 g active ingredients per kg of raw seed; imidacloprid at rates of 150, 250, 400, 800 and 950 g a.i. per kg of raw seed; CGA21'944 at rates of 200, 220, 250, 450 and 500 g a.i. per kg of raw seed. Oxamyl and vamidothion were ineffective. The application of CGA 215'944 at a rate of 500 g a.i. per kg seed gave incomplete control. With imidacloprid at a rate of 800 g a.i. per kg raw seed good protection was achieved for more than seven weeks after sowing. At the dose of 800 g a.i. per kg of raw seed the imidacloprid induced slight phytotoxic effects, evidenced by a reduction in the speed and rate of germination. Aphid predatory syrphid larvae seemed to be unharmed. Observations were carried out on active larvae on plants from both treated as well as, untreated seeds.
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