Bio-efficacy of Kresoxim Methyl 44.3 % SC Against Late Blight of Tomato under In vitro Condition

Abstract

Tomato (Lycopersicon esculentum L.) is one of the most important vegetable crops grown throughout the globe for its nutritional and antioxidant properties. In recent years, the production of this crop is hindered by various pests and diseases. Late blight is one of the most common and devastating disease of tomato crop which is caused by the fungus Phytophthora infestans. In order to manage this disease, an experiment was conducted in the laboratory of IPFT, Gurgaon. For this, different concentration of Kresoxim methyl 44.3 % SC at 80 ppm, 40 ppm, 20 ppm, 10 ppm, 5 ppm and 2.5 ppm were evaluated against late blight of tomato under in vitro using food poison technique. Observations on radial growth of the pathogen recorded after 3, 7 and 10 days of transferring culture in media showed that the Potato Dextrose Agar (PDA) plates with 80 ppm Kresoxim methyl 44.3 % SC recorded minimum radial growth of pathogen (1.53, 3.13 and 2.73 cm) followed by 40 ppm (1.69, 3.50 and 3.10 cm) after 3, 7 and 10 days of treatment application. Moreover, Kresoxim methyl 44.3 % SC at 80, 40, 20 and 10 ppm were effective over control as they exhibit more than 50 % reduction in radial growth over control. The percent inhibition of mycelial growth over control was highest (67.82 %) in PDA plates consisting of 80 ppm Kresoxim methyl 44.3 % SC followed by 40 ppm (62.96 %) after 10 days of transferring culture in media. The treatment with 5 ppm and 2 ppm recorded less than 50 % reduction of pathogen growth.