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Effects of some chlorinated hydrocarbon insecticides on nematode populations in soils



Effects of some chlorinated hydrocarbon insecticides on nematode populations in soils



Jour Econ Ent 52(5): 861-865



DDT applied in the laboratory to a loam soil at the rate of 600 and 1000 lbs./6" acre had no effect on nematodes 24 days after treatment, whereas lindane at 200 lbs./6" acre caused an 85% reduction of the total population, a 99% reduction of Aphelenchus avenae and Acrobeloides spp., and an 85% reduction of Dorylaimus spp. These differences were all significant. Rhabditis spp. or Psilenchus spp. were not affected. Field investigations with heptachlor applied to a Carrington loam at 25 and 125 lbs./acre and aldrin at 25 lbs./acre showed that 5 weeks after treatment no significant effect on the nematode populations was obtained. Miami silt loam plots were treated with aldrin, DDT, and lindane in 1954 and investigated in 1957 and 1958 to study the long-term effects of these insecticides on nematode populations. Aldrin applied at rates up to 200 lbs./6" acre in 1954 (24.6 lbs./acre present in fall of 1957) had no effect. Significant differences in nematode populations were found between the untreated soils and the plots that had been treated with DDT at a rate of 1000 lbs./6" acre in 1954 (604 lbs./acre present in the fall of 1957) and lindane at 100 lbs./6" acre in 1954 (33.5 lbs. in the fall of 1957). The lower rates of application had no effect. A saprophagous species Chiloplacus symmetricus was always significantly more numerous on both the DDT-treated (1000 lbs./acre) and lindane-treated (100 lbs./acre) plots. Nematodes of the order Tylenchida were not numerous on the lindane-treated plot. From these investigations it seems that only some chlorinated hydrocarbon insecticides or their breakdown products influence nematode populations as a result of their direct or indirect effect on certain species or groups. Saprophagous species were often increased in number. Parasitic nematodes were often reduced slightly in numbers, but as few were found it was impossible to draw any conclusion. Under field conditions, however, the nematode population was not seriously affected by the insecticides.

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Accession: 014031614

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DOI: 10.1093/jee/52.5.861


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