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In the chemical control of rodents in the Sao Paulo city (Brazil), coumatetralyl contact powder is applied in the entrance of the burrows, being subject to the action of bad weather, that could imply in alterations in the active ingredient (a.i.) and transference to other environments. In order to verify these possibilities, the rodenticide was applied in experimental systems simulating the field conditions. Soil and water samples were collected weekly, for 10 weeks, and analyzed by high performance liquid chromatography. The obtained data were used for the evaluation of the dissipation of a.i. and of the lixiviation potential in the profile of the soil. The results pointed coumatetralyl presence in the layer 0 to 5 cm of the soil during the 10 weeks. It was detected about 75% of a.i. applied in the first 3 weeks, about 20% between 5 th and 8 th weeks and about 7% in the 10 th week. In water samples of a.i it was not detected, during the 10 weeks. It was concluded that the a.i. stays in the environment for at least 10 weeks, but it doesn’t reach the underground water in the type of used soil.

COMPORTAMENTO AMBIENTAL DO RATICIDA CUMATETRALILA EM PÓ DE CONTATO