diseases of cucurbits
DESCRIPTION
Diseases of Cucurbits. Angular Leaf Spot Pseudomonas syringae pv . lachrymans. All; most serious on cucumbers Seed-borne Infested crop residue Splashing water, insects & mechanically Clean seed Resistant cultivars Crop rotation (2 years) Copper fungicides. - PowerPoint PPT PresentationTRANSCRIPT
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Diseases of Cucurbits
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Angular Leaf Spot
Pseudomonas syringae pv. lachrymans
• All; most serious on cucumbers • Seed-borne• Infested crop residue• Splashing water, insects & mechanically • Clean seed• Resistant cultivars• Crop rotation (2 years)• Copper fungicides
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Downy MildewPseudoperonospora
cubensis
• All cucurbits
• Windborne, rain-splash & mechanically• Favored by
warm days with cool nights leading to dew periods of rainfall with prolonged leaf wetness
•Resistant varieties (cucumber) •Fungicides
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Powdery Mildew Spaerotheca fuliginea & Erisyphe cichoracearum
• All cucurbits
• Windborne • Favored by warm, dry days with cooler nights
• Resistant varieties• Fungicides
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AnthracnoseColletotrichum orbiculare
Primarily cucumbers, melons and watermelons
Survives on infected crop residues Can be seedborne Wind & rain splash Resistant varieties Clean seed Destroy crop residue Fungicides Crop rotation (1 year)
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Gummy Stem Blight
Didymella bryoniae (Phoma
cucurbitacearum) All cucurbits
Survives on infected crop residues Can be seed-borne Wind & rain splash Destroy crop residue Treated seed Fungicides Crop rotation (2 year)
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Fusarium WiltFusarium oxysporum f.
sp. niveum
• Watermelon
• Soilborne • Avoid fields with a history of the disease• Crop rotation (3-5 years)• Resistant varieties
David Langston University of Georgia
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Bacterial Wilt
Erwinia tracheiphila
• All but watermelon; most serious on cucumbers and pumpkins
• Survives in asymptomatic weed hosts (?) • Insecticides• Rogue infected plants
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Papaya Ringspot Virus type W (PRSV-W)
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Watermelon Mosaic Virus (WMV)
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Zucchini Yellow Mosaic Virus (ZYMV)
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Cucurbit Viruses (potyviruses)
• All cucurbits
• Survive in a variety of weed hosts
• Aphid-transmitted in non-persistent manner
• Resistant varieties• Mineral oils• Reflective mulches