Study on the effects of six pesticides on soil bacteria in laboratory

The laboratory studies were conducted to determine the effects of six Pesticides at 3 concentrations (25%, 50% and 100%) respectively on total number of bacteria isolated from the soilin Dhale district, Yemen. The study included isolating and identifying the bacteria form the soil and the tolerance of these bacteria to common pesticides. Nutrient agar medium was used for the count of bacterial. The results showed a lack of numbers of all bacteria in the Nutrient Agar medium treated with Supermectin, Agrinate and Novacron to all (25%, 50% and 100%) concentrations, while the Shahin and Mores no inhibitory effect of 25% concentration, on the bacterial counts. Results showed that pesticides in the laboratory showed its effect on types bacteria in the Nutrient Agar medium and has been associated it effect by quantity additive concentration.