diseases of cucurbits n.
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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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angular leaf spot pseudomonas syringae pv lachrymans
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

downy mildew pseudoperonospora cubensis
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

powdery mildew spaerotheca fuliginea erisyphe cichoracearum
Powdery MildewSpaerothecafuliginea& Erisyphecichoracearum

All cucurbits

Windborne

Favored by warm, dry days

with cooler nights

Resistant varieties

Fungicides

anthracnose colletotrichum orbiculare
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)

gummy stem blight didymella bryoniae phoma cucurbitacearum
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)

fusarium wilt fusarium oxysporum f sp niveum
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

bacterial wilt erwinia tracheiphila
Bacterial WiltErwiniatracheiphila

All but watermelon; most

serious on cucumbers and

pumpkins

Survives in asymptomatic

weed hosts (?)

Insecticides

Rogue infected plants

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