Pest Management Science (2015) 71, 1419-1424

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Rebecca A. Mulligan, Sanjai J. Parikh and Ronald S. Tjeerdema (2015)
Abiotic partitioning of clothianidin under simulated rice field conditions
Pest Management Science 71 (10), 1419-1424
Abstract:
BACKGROUND
Clothianidin is registered for pre- and post-flood application in Californian rice fields for control of the rice seed midge, Cricotopus sylvestris, and the rice water weevil, Lissorhoptrus oryzophilus. The objective was to characterize air–water and soil–water partitioning of clothianidin under simulated Californian rice field conditions.
RESULTS
Clothianidin was confirmed to be non-volatile (from water) via the gas purge method, as no loss from the aqueous phase was observed at 22 and 37 °C; an upper-limit KH value was calculated at 2.9 × 10-11 Pa m3 mol-1 (20 °C). Soil–water partitioning was determined by the batch equilibrium method using four soils collected from rice fields in the Sacramento Valley, and sorption affinity (Kd), sorbent capacity, desorption and organic-carbon-normalized distribution (Koc) were determined. Values for pH, cation exchange capacity and organic matter content ranged from 4.5 to 6.6, from 5.9 to 37.9 and from 1.25 to 1.97% respectively. The log Koc values (22 and 37 °C) ranged from 2.6 to 2.7, while sorption capacity was low at 22 °C and decreased further at 37 °C. Hysteresis was observed in soils at both temperatures, suggesting that bound residues do not readily desorb.
CONCLUSIONS
Soil–water and air–water partitioning will not significantly reduce offsite transport of clothianidin from flooded rice fields via drainage.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website


Research topic(s) for pests/diseases/weeds:
health/environmental effects of pesticides


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Cricotopus sylvestris Rice (Oryza) U.S.A. (SW)
Lissorhoptrus oryzophilus Rice (Oryza) U.S.A. (SW)