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Diseases of Cucurbits

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.

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Diseases of Cucurbits

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  1. Diseases of Cucurbits

  2. Angular Leaf SpotPseudomonas syringaepv. 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

  3. 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

  4. Powdery MildewSpaerothecafuliginea& Erisyphecichoracearum All cucurbits Windborne Favored by warm, dry days with cooler nights Resistant varieties Fungicides

  5. 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)

  6. Gummy Stem BlightDidymellabryoniae(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)

  7. Fusarium WiltFusarium oxysporumf. sp. niveum David Langston University of Georgia Watermelon Soilborne Avoid fields with a history of the disease Crop rotation (3-5 years) Resistant varieties

  8. Bacterial WiltErwiniatracheiphila All but watermelon; most serious on cucumbers and pumpkins Survives in asymptomatic weed hosts (?) Insecticides Rogue infected plants

  9. Papaya Ringspot Virus type W (PRSV-W)

  10. Watermelon Mosaic Virus (WMV)

  11. Zucchini Yellow Mosaic Virus (ZYMV)

  12. Cucurbit Viruses (potyviruses) • All cucurbits • Survive in a variety of weed hosts • Aphid-transmitted in non-persistent manner • Resistant varieties • Mineral oils • Reflective mulches

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