K. VENKATARAMANAMMA, S. NEELIMA, K. ASHOK KUMAR AND K. VISHNUVARDHAN REDDY

AICRP on Sunflower, Regional Agricultural Research Station, ANGRAU Nandyal, Andhra Pradesh

ABSTRACT

Three major diseases such as necrosis, Alternaria leaf spot and Powdery mildew affecting sunflower cultivation in Andhra Pradesh. For management of these diseases in an integrated way, seven different treatments were imposed on Sunflower crop at RARS, Nandyal. Among the treatments tested for Alternaria leaf spot, the treatment T4 (Seed priming (carbendazim 2 g/kg + thiamethoxam 70 WS @ 4 g/kg) + two sprays of Propiconazole @ 0.1% + Azadarictin @ 1.5 ml/l) has given lower Percent Disease Index (PDI) of 23.13 per cent and it is followed by T3 and all these treatments are on par with each other except T5. For necrosis disease, the treatment T2 (Seed priming (carbendazim 2 g/kg + thiamethoxam @ 4 g/kg of seed) + two sprays propiconazole@ 0.1% + thiamethoxam @ 0.2 g/l) has given lower necrosis incidence, followed by the treatment T6. Significant effect of all the treatments over powdery mildew disease incidence was noted in all the treatments except T5. The treatment T4 has given better yield and higher benefit cost ratio of 0.84 than all the treatments, followed by T3 which has given higher benefit cost ratio of and 0.82. Hence, to manage the Alternaria leaf spot and necrosis of sunflower application of either T4 or T2 treatments proved effective.

KEYWORDS:

Sunflower, Alternaria leaf spot, Necrosis, Powdery mildew, Propiconazole, Thiamethoxam