1. Diseases of Cucurbits

2. 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

3. Downy Mildew Pseudoperonospora 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

5. Powdery Mildew Spaerotheca fuliginea & Erisyphe cichoracearum
All cucurbits
Windborne
Favored by warm, dry days
with cooler nights
Resistant varieties
Fungicides

6. Anthracnose Colletotrichum 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)

7. 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)

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

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

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

12. Watermelon Mosaic Virus
(WMV)

13. Zucchini Yellow Mosaic Virus (ZYMV)

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