Studies on the post symptom anti-sporulant activity of fungicides, bio-control agents, bio-products and botanicals on formation of conidia of Podosphaera pannosa on rose

Abstract

Anti-sporulant activity of fungicides (carbendazim, difenoconazole, hexaconazole, propiconazole, tebuconazole, pyraclostrobin, trifloxystrobin + tebuconazole and dinocap), bio-control agents (Ampelomyces quisqualis, Pseudomonas fluorescence, Trichoderma viride, Saccharomyces cerevisiae, Bacillus subtilis and Verticillium lecanii), bio-products (vermiwash, chicken manure, FYM, milk, anhydrous milk fat, neem oil, BF-1 [Turmeric (25g)+Chilli (5g)+Onion (25g)], BF-2 [Garlic paste (25g)+Turmeric (5g)] and BF-3 [Reetha (5%) + Cow urine + Neem oil (5%)]) and botanicals (drake (Melia azedarach L.), robinia (Robinia pseudoacacia L.), bougainvillea (Bougainvillea glabra C.), pine needles (Pinus roxburghii S.), garlic (Allium sativus L.), euphorbia (Euphorbia resinifera A.), reetha (Sapindus mukorossi L.) and soybean Seed (Glycine max L.)) were studied after the appearance of disease. The maximum reduction in conidia production was recorded in difenoconazole giving by 29.98 per cent reduction followed by the hexaconazole (25.56%), tebuconazole (25.14%) and trifloxystrobin + tebuconazole (24.76%) while the least effect was observed with carbendazim (16.55%). Among the bio-control agents the maximum reduction in conidia was found in Ampelomyces quisqualis (26.50%) followed by the Bacillus subtilis (24.44%) and Verticillium lecanii (20.54%) within 8 days of disease observation. However, least reduction in conidia were recorded in Pseudomonas fluorescence (9.20%) and yeast (11.10%). From bio-products neem oil, bio-formulation-3, milk and anhydrous milk fat were reported to be superior and while the bio-formulation-1 (8.24%) and vermiwash (9.69%) were less effective in lowering the conidial count. However, among the botanicals best results with regard to conidia reduction was obtained with Allium sativus (21.01%) followed by the Sapindus mukorossi (18.95%) and Melia azedarach (18.01%) both statistically at par in their effectiveness. While least conidial reduction (6.42%) was recorded in Glycine max.