NTEGRATED APPROACH FOR THE MANAGEMENT OF PURPLE BWTCH OF ONION CAUSED BY Alternaria porrt

Abstract

The experiment was conducted in the fann of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh, during the winter season 2009-2010 to evaluate the efficacy of fungicides, poultry manure and neem seed extract against purple blotch of onion. The field experiment was laid out using onion variety Taherpuri to evaluate the eighteen different treatments combination of fungicides, poultry manure and neem seed extract with different spray schedules. A positive and significant effect of fungicides, poultry manure and neem seed extract was found in respect of % plant infection, % leaf infection, % Leaf Area Diseased (%LAD) and yield of onion. The highest performance in reducing disease incidence and disease severity of purple blotch of onion was found by the application of treatment PDF 1S7 where soil was amended with poultry manure and onion seedlings were dipped in Rovral SOWP solution followed by foliar spraying with same fungicide at seven days interval. The highest onion bulb yield (S.063t/ha) was recorded in case of application of treatment PDF 187• Neem seed extract also showed better performance in combination with poultry manure in reduction of disease incidence and severity as well as increasing yield