Onion Disease Management

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<strong>Disease</strong> control • Do not plant infested bulbs • Likelihood of disease is lower in fields with air movement • Well drained fields • Lower plant densities • No windbreaks • Frequent fungicide applications when conditions favor disease development
Fungicide efficacy, Imperial County 2003 • Imperial Valley Research Center, Brawley • Dehidrator onions were grown according to commercial practice • Experimental design • Six replication RCB • Plot size: 4 rows x 30 ft • The first sign of downy mildew was observed on 11 March
Page 1 and 2: Onion Disease Management Thomas Tur
Page 3 and 4: Downy mildew Peronospora destructor
Page 5: Disease development • Favorable e
Page 9 and 10: Treatment, units/acre 2-10 Applicat
Page 11 and 12: Results Ap # 1 2 3 4 5 Date 2-10 2-
Page 13 and 14: Iris yellow spot virus of onion Imp
Page 15 and 16: Iris yellow spot virus of onion Ida
Page 17 and 18: Biology • Host Range: Iris, Jimso
Page 19 and 20: Economic loss • In most infected

Onion Disease Management

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