The route and rate of thiamethoxam soil degradation in laboratory and outdoor incubated tests, and field studies following seed treatments or spray application.

ABSTRACT:

Background

The route and rate of degradation of thiamethoxam in the laboratory and field was investigated. The effect of dark incubation versus light/dark cycles, seed treatment versus spray, and watering-in for spray application was explored in side-by-side trials.

Results

Geometric mean DT₅₀ values were 75.4 days in OECD307 studies, and 18.3 (spray) and 16.5 (seed treatment) days in the field. In laboratory soil core studies DT₅₀ values were 24.9 to 43.5 days, with the lowest value from the light/dark incubated soil core. Mean clothianidin formation was 19.7% applied thiamethoxam [mol/mol] in OECD307 studies and 17.5 (spray) and 3.4% (seed) in field trials.

Conclusion

Soil DT₅₀ values decreased with increasingly realistic tests (labo

SUBMITTER: Hilton MJ 

PROVIDER: S-EPMC6585703 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature