Australasian Plant Disease Notes (2020) 15 (34) - Propineb efficiency in

E.R. Araújo and R.S. Resende (2020)
Propineb efficiency in controlling downy mildew of onion under field conditions
Australasian Plant Disease Notes 15 (34)
Abstract: Downy mildew of onion has worldwide occurrence. This study aimed to evaluate the effect of weekly sprays of different active ingredients on the area under a disease progress curve (AUDPC) and on the commercial yield of onion, under field conditions. We observed that propineb sprays resulted in the highest values of yield in 2017 (32.98 t ha^-1) and 2018 (20.70 t ha^-1). Propineb (130.66) and metalaxyl-M + mancozeb (144.66) presented the lowest AUDPC values in 2017. Metalaxyl-M (100 g ha^-1) + mancozeb (1600 g ha^-1), bentiavalicarb-isopropyl (56.25 mL ha^-1) + chlorothalonil (562.5 mL ha^-1) and bentiavalicarb-isopropyl (40 mL ha^-1) + fluazinam (100 mL ha^-1) resulted in higher yields than the control (water) in the two years of testing. We emphasise the importance of using fungicides with protective action to control downy mildew of onion.
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Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Peronospora destructor	Onion/garlic/leek (Allium)	Brazil (south)