Evaluación de la resistencia de un aislado bacteriano nativo compatible con Pseudomona sp. al insecticida Lorsban 4 EC
Quinchía-Figueroa, A. M. (Adriana María) | 2014-05-07
The resistance of an isolated bacterial culture compatible with Pseudomona sp. to the insecticide
Lorsban 4 EC (active ingredient Chlorpyrifos) was evaluated at laboratory scale. The bacterial culture was
isolated from a soil sample obtained in East Antioquia that was exposed to the application of the insecticide
which is used in grass culture.
The principal factors that affect the mobility and adsorption of insecticides in soil were analyzed. The
results showed a high percentage of organic matter, and macro and micronutrients as well as medium to
high cationic capacity of exchange, which facilitates the adsorption of the pesticide in the colloidal fraction
of organic and inorganic fraction. The sandy texture of the soil generates good aeration that favors the processes
of volatilization and degradation of the pesticide.
Isolated bacterial culture was exposed to different concentrations of the insecticide (480, 4,800, 24,000
and 48,000 ppm), to evaluate the effect of the agent on the bacterial population. According to the results of
the tests, the native isolated bacterium compatible with Pseudomona sp. is resistant to the insecticide concentrations
studied and possibly has the capacity to degrade the Lorsban 4 EC.