Effect of the Treatments in Controlling Purple Blotch Complex of Onion (Allium cepa L.)

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 A field experiment was conducted during the rabi season to study the management of Purple blotch of onion through some chemicals and plant extracts. The experiment was laid out in a Randomized Complete Block Design (RCBD) with 3 (three) replications of each treatment. There were 11 treatments in the experiment comprising Dithane M-45, Rovral, Bavistin, Cupravit, Proud, Champion, Tilt, Ridomil, Neem extract, Alamanda extract and Control. Results exhibited that all the plant parameters were increased with applying different fungicides and plant extracts with their effectiveness. The % plant infection, % leaf infection, % Leaf Area Diseased (% LAD) and Percent Disease Index (PDI) were observed five times. All of these parameters were found lowest in foliar spray of Rovral and highest was found in control treatment. After Rovral, Ridomil and Dithane M-45 were found most effective to minimize the disease severity as well as increase of yield. Between two plant extracts Neem extract performed better than Alamanda extract.

Umme Sarifun Akter
Harun Or Rashid
Aminur Rahman
Rafiqul Islam
Maksudul Haque
Academic Journal of Plant Sciences