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Reaction of Rhabditis Oxycerca After Long-Term Exposure To Aldicarb and Oxamyl. Part I: General Observations

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For more content, see Nematology.

Rhabditis oxycerca reared on oat meal culture medium was subjected to increasing concentrations of aldicarb and oxamyl. In 1975, the nematodes tolerated 1 ppm aldicarb and 5 ppm oxamyl; by 1981 they tolerated 200 and 250 ppm respectively and by 1984 more than 400 ppm of each product. The decline of sensitivity was followed in population development studies, vitality tests and reproduction tests. Morphological changes, in particular the body length, were checked and the composition of the microflora in the culture media with and without nematicides was determined. Nematodes from nematicide-treated populations were less sensitive to nematicides, exposure to aldicarb increasing tolerance more than exposure to oxamyl. Aldicarb pretreatment increased tolerance to subsequent oxamyl treatment, while in some tests oxamyl-pretreated strains showed an increase in susceptibility to aldicarb. There were various signs of diminished activity in animals exposed to nematicide after transfer to nematicide-free media. The microflora of the culture media does not seem to be essentially altered by the nematicides. All reactions tested here indicate an increasing resistance of the nematodes. This is confirmed by our investigations of the enzymes involved, to be presented in a second part.

Affiliations: 1: Ernst-Moritz-Arndt-University, Department of Zoology, DDR-2200 Greifswald, German Democratic Republic


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