COMPARATIVE EFFICACY OF BIO CONTROL AGENT BACILLUS SUBTILIS AND FUNGICIDES AGAINST POWDERY MILDEW OF APPLE

摘要

Comparative efficacy of Biocontrol agent Bacillud Subtilis and fungicides was studied against powdery mildow of apple at Hill Fruit Research Sub Station Murree during the year 2012-13 for this purpose mycoparasite based product Taegro (Bacillus subtilis strain FZB24) and three fungicides (Sulfex gold 80 WP, Topass 100 EC & Topsin M 72 WP) were tested as preventive and curative treatments at their recommended doses under natural environmental conditions.. In cases of preventive sprays Taegro @ 6 g per litre of water gave 70.27 percent disease control. This product @12 g per liter of water gave disease control upto 78.07 percent. Mean incidence in untreated control treatment remained as 33.22 percent. Disease control in Sulfex Gold 80 WP, Topass 100 EC and Topsin M 72 WP remained as 72.78, 82.96 and 76.88 percent respectively. in case of curative treatments at the time of more than 25 percent disease incidence, Taegro @ 6 g per litre of water gave 37.43 percent disease control and @ 12 g per litre of water, it gave disease control upto 44.52 percent. Mean disease incidence in untreated control treatment was remained as 40.00 persent. Fungicides, Sulfex Gold 80 WP, Topass 100 EC and Topsin M 72 WP, gave disease control to 39.76%, 75.02% and 68.51 percent respectively.