Department of Plant Pathology, Punjab Agricultural University, Ludhiana-141004
National Symposium on Strategic Issues in Plant Pathological Research held at Department of Plant Pathology, CSK HP Krishi Vishvavidayalaya, Palampur on November 24–25, 2011
Late blight caused by Phytophthora infestans (Mont.) de Bary is one of the most serious fungal diseases of potato that can cause yield reduction to the tune of 100% in the susceptible cultivars. Field efficacy of five new fungicides viz. Cabrio Top @ 0.2%, Ergon @ 0.2%, Moximate 72 WP @ 0.25%, Sectin 60 WG @ 0.12% and Valiphenal(IR 5885) 6%+Mancozeb 60%WG @ 0.25% was determined against late blight of potato and compared with the standard fungicides during 2009–10 and 2010–11 crop seasons. These fungicides were comparable in their efficacy with that of Curzate M 8, Indofil M-45 75 WP and Ridomil MZ 72 WP. The disease was either in traces or at very low level in treatments with these fungicides. A corresponding increase in tuber yield (94.0 to 165.3%) was also observed in different fungicide treatments as compared to untreated control. Among these fungicides, Ridomil MZ @ 0.25% found to persist for 9 and 12 days in laboratory and field condition, respectively, followed by Ridomil Gold, Cabrio Top, Valiphenal and Amistar. The results indicated high effectiveness of new fungicides in controlling potato late blight and can serve as viable alternatives to the fungicides being currently used in managing potato late blight.
