Determination of Median Effective Inhibitory Concentration of Three Fungicides Widely Used for Treatment of Wheat on the Target Pest Fusarium sp.

The pathogenic Fusarium species attack plants of major economic importance including wheat.Infection of cereal plants causes significant losses in crops but also the deterioration of the quality of grains and economic losses resulting are often very heavy.In the present study, the efficacy of three fungicides (thiram, tebuconazole and fludioxonil+difenoconazole) tested in vitro for their inhibitory activities against the target pest Fusarium sp., isolated from infected seed of wheat.Fungi toxicity was expressed as a percentage of inhibition of mycelial growth.The median lethal dose was calculated for each tested active ingredient.Among the chemical fungicides which were used, thiram was the most effective with EC 50 value of 0.15 mg LG 1 followed by the mixture fludioxonil-difenoconazole with a value equal to 0.27 mg LG 1 and finally tebuconazole with 3.79 mg LG 1 .