Study the effect of integrated disease management approach on germination, plant height and yield of potato and on severity of late blight of potato Phytophthora infestans (Mont.) de Bary.

Abstract

Late blight of potato caused by Phytophthora infestans (Mont.) de Bary is one of the most serious diseases of potato. Several management practices have been adopted so for to minimize the disease. But in present investigation based on laboratory and glass house condition revealed that soil application and tuber seed dressing with bioformulation provided good protection against late blight and also stimulate the germination. The data showed that the plant height of potato was maximum in treatments T1(Soil application of FYM @ 125gm/pot +mushroom waste with T. harzianum @ 5gm/gm+tuber treatment with Azotobacter @ 5%+foliar spray with Ridomil @ 0.25%) with the value of 44.9 cm at 30 days age of plant. Tuber treatment with bio agents stimulated the germination per cent of the tuber. The Maximum germination per cent was noted in case of T1(Soil application of FYM @ 125gm/pot+mushroom waste with T. harzianum@ 5gm/kg+tuber treatment with Azotobacter@5%+foliar spray with [email protected]%). Growth promoting effects of the soil amendment+ tuber treatment + foliar spray were also perceived. The fungicides and bio agents were found to increase the plant length over control. Foliar spray with the fungicides pathogenic inoculation protected the plants against infection resulting reduced disease severity. The minimum disease severity (10.66) was reported from treatments were given as treatment T1(Soil application of FYM 125gm/pot+ mushroom waste with T. harzianum 5gm/kg +tuber treatment with Azotobacter @5%+foliar spray Ridomil @ 0.25%) treated plants against 82.33% disease severity in case of control. The integrated effect o FYM+ mushroom waste as soil application bioformulation as tuber 51.67gm, and total weight of tuber 338.33gm, where trea tment was given as soil application of FYM @125gm/pot+ mushroom waste with T. harzianum@ 5gm/kg+tuber treatment with T. harzianum @5%+foliar spray with 665.02gm was recorded from treatment T1(Soil application of FYM 125gm/pot +mushroom waste T. harzianum @ 5gm/kg+tuber treatment with Azotobacter@ 5%+foliar spray with Ridomil @ 0.25%).