Comparative In vitro Assessment of Fungicides against Alternariaster helianthi in Sunflower

Abstract

The present study aimed to evaluate the efficacy of systemic and contact fungicides against Alternariaster helianthi under In vitro Conditions”. Alternariaster leaf spot (Alternariaster helianthi Hansord, Simmons) is one of the major disease of sunflower during kharif 2024 season in Maharashtra. Present lab study was conducted at Department of Plant Pathology and field experiment at Oilseed Research Station, College of Agriculture, Latur, VNMKV, Parbhani, Maharashtra, India. Here, six systemic fungicides and six contact and combi products evaluated at 500 and 1000 ppm by poisoned food technique, against A. helianthi an incitant of Alternariaster leaf spot; in sunflower among the systemic fungicides, there was 100%  growth inhibition with the fungicide tested viz., Propiconazole 25% EC and Carbendazim 50% WP at 500 ppm and 1000 ppm and maximum inhibition was observed in Difenoconazole 25% EC with growth inhibition (68.89% and 71.10%) followed by Azoxystrobin 23% SC (63.33% and 68.89%), Thiophanate methyl 70% WP with (60.74% and 65.56%) and Benomyl 50% WP (54.82% and 56.67%) at 500 ppm and  1000 ppm respectively. Among non-systemic fungicides there was 100.00% inhibition in fungicides viz., Mancozeb 75% WP and Azoxystrobin 18.2% + Difenoconazole 11.4% SC followed by Carbendazim 12% + Mancozeb 63% resulted with mycelial growth inhibition (92.88% and 100%), Fluopyram 17.7% + Tebuconazole 17.7% 400 SC (64.45% and 84.45%), Dimethomorph 12% + Pyraclostrobin 6.7% WG (58.89% and 83.34%) and Boscalid 25.2% + Pyraclostrobin 12.8% WG (54.45% and 82.23%) at 500 ppm and 1000 ppm respectively.