American Journal of Plant Sciences (2016) 7, 715-723

Hasan Ali, Hosna Ara Chowdhury Nisha, Md. Belal Hossain and Md. Rafiqul Islam (2016)
Evaluation of combined effect of micronutrients (ZnSO₄ + Borax) and fungicides to control the purple blotch complex of onion (Allium cepa)
American Journal of Plant Sciences 7 (5), 715-723
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.
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Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Stemphylium vesicarium	Onion/garlic/leek (Allium)	Bangladesh
	Alternaria porri	Onion/garlic/leek (Allium)	Bangladesh