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Results on Pesticides in October 2009
October 2009
The pesticide monitoring campaign started August 2008 and ended September 2009.
To date, surface water samples taken between August 2008 and April 2009
are analysed. Thirteen of the fifteen target compounds (buprofezin,
butachlor, cypermethrin, difenoconazole, endosulfan sulphate, fenobucarb,
fipronil hexaconazole, isoprothiolane, profenofos, pretilachlor, propanil and
propiconazole) were detected in water samples taken at the two study
sites from field discharges and irrigation canals.
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Preliminary monitoring results
March 2009
First
results of the monitoring activities are available for the period mid August – end
October 2008. In Ba Lang three types of fungicides - Hexaconazole, Propiconazole and
Difenoconazole - were detected in the samples. Propiconazole and Hexaconazole were
recorded in nearly all samples in concentrations up to 781.9 and 135.9 ng/l
respectively.
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Target pesticides and method development
January 2009
Based
on the interviews, physicochemical properties (solubility, hydrolysis half-life,
octanol-water partition coefficient, soil sorption, soil degradation half-life, GUS
leaching potential index) of the substances and their potential to harm humans or
aquatic organisms (toxicity - WHO hazard class- and fish acute LC50) twelve target
pesticides have been selected for monitoring.
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Study sites
Year 2008
Within the three WISDOM project areas two
study sites have been identified where pesticide monitoring and modelling are conducted.
One study site is located in Ba Lang ward, Cai Rang District, Can Tho Province and one
in An Long commune, Tam Nong District, Dong Thap Province. The two study sites account
for different land use, water management and pesticide use scenarios.
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Pests/diseases of concern and pesticide usage
Year 2008
Brown
plant hopper (BPH) Nilaparvata lugens is perceived as the most severe pest of rice in
Vietnam. Direct damage is caused by feeding of the nymphs and adults causing “hopper
burn” of the rice plants. Additionally, many of the brown plant hoppers are transmitter
of the rice grassy stunt virus (RGSV) and/or rice ragged stunt virus (RRSV) causing
severe and often epidemic-like infection of rice plants.
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