Vol. 11, Issue 7 (2022)

Author(s):
Poornima, Vikas V Kulakarni, Vijaykumar N Ghante and Umesh MR

Abstract:
Plants are found to be infected by various microbial organisms such as fungus, virus, and bacteria which threaten their survival or reduce growth of the plants. In response to pathogen attack, plants have evolved several strategies to counteract pathogen infection. There are changes in plants physiology of plants after microbial attack results in active induced defense mechanisms. These active defense mechanisms refer as induced resistance, which occur after infection of plants by the pathogen and provide protection against subsequent attack of pathogen. Systemic acquired resistance (SAR), which is induced by inoculation of virulent or non-virulent pathogen and Salicylic acid dependent. Therefore, the present experiment was aimed at use of plant defense inducers for the management of Alternariaster leaf spot and Sunflower necrosis disease. Our results indicate that Seed treatment with salicylic acid @ 100 ppm followed by foliar spray of salicylic acid @ 100 ppm at 30 and 45 days after sowing have contributed more yield 1576 kg/ha and B:C ratio 1.54 with least Alternariaster leaf spot 20.93% and necrosis diseases 6.37% followed by Seed treatment with salicylic acid @ 50 ppm followed by foliar spray of salicylic acid @ 50 ppm at 30 and 45 days after sowing have contributed more yield 1413 kg/ha and B:C ratio 1.28 with least Alternariaster leaf spot 26.43% and necrosis diseases 11.16%. whereas highest Alternariaster leaf spot 57.19% and necrosis diseases 19.89% were recorded in control.