Effect on a single soil pre-treatment with aldicarb and carbofuran on their subsequent behaviour and field performance
1996
Pussemier, L. | Debongnie, P. (Institute for Chemical Research, Tervuren (Belgium)) | Suett, D. | Jukes, A. | Serneels, F.
In the spring of 1995, a field experiment was carried out in Ath in order to study the practical consequences of accelerated degradation of soil-applied insecticides under Belgian conditions. A field site was selected and samples taken in the spring of 1994 in order to check their potential for carbofuran and aldicarb degradation. The site was divided into three sub-plots, which in 1994 were cropped and treated with, respectively, (a) carrots and carbofuran (1.5 kg active ingredient per ha), (b) sugar beets and aldicarb (1.0 kg active ingredient per ha) and (c) potatoes and no soil insecticide. At the end of the growing season new soil samples were taken in order to assess, under laboratory conditions, the biodegradation potential of these sub-plots after the different soil treatments. The 1995 field experiment was carried out using radish as an indicator crop, and the soil-insecticides were applied according to a logarithmic gradient, using an experimental device brought from Horticulture Research International in England. At harvest, the crop was assessed for damage by the cabbage root fly (Delia radicum). The laboratory results showed that, with carbofuran but not with aldicarb, a single previous treatment increased the degradation rate significantly. There was no evidence of cross-adaptation between the two insecticides. In the field experiment, a significant reduction in biological efficacy of carbofuran was observed when it was applied to the previously carbofuran-treated soil but its performance in the other soils was unchanged.
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