Evaluation of fungicides for management of downy mildew of isabgol caused by Pseudoperonospora plantaginis in Rajasthan

The isabgoal (Plantago ovata Forsk.) is an important medicinal crop and it is grown in arid or semi region of Rajasthan. Annually a major production become suffered due to Pseudoperonospora plantaginis, causes Downy mildew of isabgol and results in a considerable loss in yield. The fungicides were tested to prevent the Downey mildew disease of isabgoal. The efficacy of 6 fungicides i.e Apron 35 SD, Ridomil MZ, Fosetyl Al, Carbendazim, Mancozeb and Blitox were evaluated at 5, 10, 25, 50, 100 and 200 ppm concentration against zoosporangial germination. Minimum zoosporangial germination was recorded in Apron35 SD (4.81%) followed by Ridomil MZ-72 WP, Fosetyl Al and Mancozeb. In the field trials, the systemic infection in different treatment ranged from 4.47 to 10.33 per cent and non-systemic infection ranged from 48.67 to 60.67 per centin both the years. Three seed dressers ot four doses(0.5, 1.0, 1.5 and 2%) of each were evaluated, Apron35 SD (2g per kg seed) proved most effective in reducing infection as compaired to control 691kg/ha. Seed yield in different treatment varied from 730 to 820 kg per ha in both the years.