Performance and environmental studies with storm (Flocoumafen) block baits in ricefields in the Philippines
1990
Hoque, M.M. | Olvida, J.L. (Philippines University at Los Banos, Laguna (Philippines). National Crop Protection Center) | Jones, R.G.
The two essential features demanded of any new rodenticide and their performance and safety to humans, domestic animals and wildlife. Numerous studies have been carried out to determine the efficacy of Shell's new anticoagulant rodenticide flocoumanfen as measured by its toxicity (including effect on resistant strains) and palatability. The environmental hazard imposed by a rodenticide is determined not only by the toxicity of the active ingredient to non-target wildlife, but also their exposure to it. As with efficacy, toxicity can be determined in laboratory tests, but both performance and exposure can best be assessed during trials simulating real use. In large-scale trials (pulse baiting) with Storm block baits (0.05 percent flocoumafen) in ricefields and adjacent village housing in the Philippines, very effective rodent control was achieved using, on a average, only 1.175 kg/ha/season. In addition, the environmental impact of the treatment was negligible. Few domestic animals were attracted to the block bait and no domestic or wildlife casualties were reported even after extensive carcass searching. The total residues of flocoumafen in the ricefield rats also indicated a low secondary hazard. Residues were highest shortly (2 days) after baiting (mean 0.36 mg/kg) falling to below 0.03 mg/kg, 10-25 days after baiting. Although additional studies in the Philippines and elsewhere are continuing these results clearly show that when used as directed an advanced and well formulated rodenticide can give cost-effective rodent control with minimal environmental impact
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