Abstract
Ten different treatments viz. T0 = Control, T1 = Micronutrients (ZnSO4 + Borax), T2 = Rovral 50 WP + Micronutrients, T3 = Dithane M-45 + Micronutrients, T4 = Ridomil Gold + Micronutrients, T5 = Cupravit + Micronutrients, T6 = Rovral 50 WP, T7 = Dithane M-45, T8 = Ridomil Gold and T9 = Cupravit were evaluated against the purple blotch complex disease of onion caused by Alternaria porri and Stemphylium vesicarium in field condition for bulb yield. In lab condition, all the tested chemical fungicides (Rovral 50 WP, Dithane M-45, Ridomil Gold MZ-72 and Cupravit 50 WP) significantly reduced mycelial growth of both pathogens. Among the fungicides, Rovral 50 WP @ 0.2% reduced the highest radial mycelial growth followed by Dithane M-45 @ 0.45% and Ridomil Gold MZ-72 @ 0.2% compared to control. In field experiment, application of Rovral 50 WP @ 0.2% along with micronutrients showed significant effect in reducing disease incidence and severity which significantly increased bulb yield and yield contributing characters.
Highlights
Onion (Allium cepa) is one of the most important and familiar spices crops throughout the world
Stemphylium vesicarium, the causal agent of white blotch of onion is considered as the pathogen that initiates the infection on onion, which facilitates the subsequent infection of Alternaria porri causing purple blotch and presently the disease is named as Purple Blotch Complex of onion
Considering the above factors the present study was undertaken to study the combined effect of micronutrients (ZnSO4 + Borax) and selected fungicides to control the purple blotch complex of onion
Summary
Onion (Allium cepa) is one of the most important and familiar spices crops throughout the world. Stemphylium vesicarium, the causal agent of white blotch of onion is considered as the pathogen that initiates the infection on onion, which facilitates the subsequent infection of Alternaria porri causing purple blotch and presently the disease is named as Purple Blotch Complex of onion. This disease is very important as it reduces the bulb yield which directly affects seed yield and quality. Considering the above factors the present study was undertaken to study the combined effect of micronutrients (ZnSO4 + Borax) and selected fungicides to control the purple blotch complex of onion
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