Reduction in biological efficacy of ethoprophos in a soil from Greece due to enhanced biodegradation: comparing bioassay with laboratory incubation data
✍ Scribed by Karpouzas, Dimitrios G; Giannakou, Ioannis O; Walker, Allan; Gowen, Simon R
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 105 KB
- Volume
- 55
- Category
- Article
- ISSN
- 1526-498X
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✦ Synopsis
Soils were collected from a potato-growing area in Serres, Northern Greece, where the nematicide ethoprophos was reported to have lost its effectiveness against cyst nematodes following 30 years of regular use. Incubation studies with ethoprophos and two bioassays using root-knot nematodes demonstrated that, in this heavily treated soil, the nematicide was degraded rapidly and nematicidal activity persisted only up to 14 days. In soil from an adjacent ®eld with no known history of nematicide use during the preceding 14 years, ethoprophos was degraded more slowly and retained its nematicidal activity for more than 35 days. Ethoprophos ef®cacy was extended when the soil that had been treated in the ®eld was autoclaved, although the effect was only transitory. The addition of `preconditioned' soil from the previously treated ®eld to samples of soil from the previously untreated ®eld resulted in a signi®cant acceleration of ethoprophos degradation compared with that observed in unamended soil from the previously untreated ®eld.