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Diagnostic Key:Wilt, stem, vine, crown, damping off on Cucurbits

Diseases causing wilt and general decline symptoms on cucurbits

Bacteria

Fungi/oomycete

Phytoplasma

Viruses

Miscellaneous

 

Bacteria

Bacterial wilt:crown, vines, petioles

Wilt & general plant decline symptoms


Symptoms shown on pumpkin

See symptoms on:

Pumpkin & Gourd
 Cucumber Melon Summer Squash Winter Squash Watermelon
No Photos Available
Wilt initially affecting single leaves, and begins as yellowing and then death of tissue between main veins, wile veins themselves remain green in color. Wilt progresses to individual runners of a plant. Cut stem, squeeze sap from cut ends, put 2 pieces together, then slowly pull them apart while looking for characteristic thin strands of sticky bacterial material. Strands do not always form, so repeat several times until seen. Cucumber beetles present (or previously) on leaves or in flowers.

Cucurbit yellow vine decline:crown, vines, petioles

Crown area symptoms present

Symptoms shown on melon

 See symptoms on :

Pumpkin & Gourd
No Photos Available

 Cucumber
No Photos Available 		Melon Summer Squash
No Photos Available 		Winter Squash
No Photos Available 		Watermelon
No Photos Available
 

Fungi/oomycete

Anthracnose:crown, vines, petioles

Crown area symptoms present


Symptoms shown on melon

 See symptoms on:

Pumpkin & Gourd
No Photos Available

Cucumber
No Photos Available 		Melon Summer Squash
No Photos Available 		Winter Squash
No Photos Available 		Watermelon
No Photos Available
 

Fusarium crown rot:crown, vines, petioles

Wilt & general plant decline symptoms

Symptoms shown on pumpkin

 See symptoms on
Pumpkin & Gourd Cucumber Melon Summer Squash Winter Squash Watermelon
No Photos Available
Wilt initially affecting single runners of a plant. Crown may be girdled. Distinctive dark brown decay a base of stem, with white or pinkish fungal growth, becomes soft and mushy. Yellow, orange or brown discoloration in water conducting tissue at base of plant. Fruit rot also. Localized occurrence in field and in region.

Fusarium wilt:crown, vines, petioles

Crown area symptoms present


Symptoms shown on melon

 See symptoms on:

Pumpkin & Gourd
No Photos Available

Cucumber
No Photos Available 		Melon Summer Squash
No Photos Available 		Winter Squash
No Photos Available 		Watermelon
No Photos Available
 

Gummy stem blight:crown, vines, petioles

Crown area symptoms present


Symptoms shown on pumpkin

 See symptoms on :
Pumpkin & Gourd Cucumber
No Photos Available 		Melon Summer Squash
No Photos Available 		Winter Squash
No Photos Available 		Watermelon
No Photos Available
 

Phytophthora crown and root rot:crown, vines, petioles

Wilt & general plant decline symptoms


Symptoms shown on pumpkin

 See symptoms on
Pumpkin & Gourd Cucumber
No Photos Available 		Melon
No Photos Available 		Summer Squash Winter Squash Watermelon
No Photos Available
Wilting and rapid plant decline. Vine collapsed and brown. Starts in areas with poor drainage after soil was saturated with water. Fruit rot also. Dark leaf spots occur rarely. Localized occurrence in field and in region.

Plectosporium:crown, vines, petioles

Crown area symptoms present

Symptoms shown on pumpkin

 See symptoms on :
Pumpkin & Gourd Cucumber

Melon
No Photos Available

 Summer Squash
No Photos Available 		Winter Squash
No Photos Available 		Watermelon
No Photos Available
 

Powdery mildew:crown, vines, petioles

Crown area symptoms present


Symptoms shown on pumpkin

 See symptoms on:
Pumpkin & Gourd Cucumber
No Photos Available 		Melon
No Photos Available 		Summer Squash
No Photos Available 		Winter Squash
No Photos Available 		Watermelon
No Photos Available
 

Scab:crown, vines, petioles

Crown area symptoms present


Symptoms shown on winter squash

 See symptoms on :
Pumpkin & Gourd
No Photos Available 		Cucumber
No Photos Available 		Melon
No Photos Available 		Summer Squash
No Photos Available 		Winter Squash Watermelon
No Photos Available
 

Ulocladium:crown, vines, petioles

Crown area symptoms present


Symptoms shown on cucumber

 See symptoms on :
Pumpkin & Gourd
No Photos Available 		Cucumber Melon
No Photos Available 		Summer Squash
No Photos Available 		Winter Squash
No Photos Available 		Watermelon
No Photos Available
 

Phytoplasma

Aster yellows:crown, vines, petioles

Crown area symptoms present


Symptoms shown on pumpkin

 See symptoms on :
Pumpkin & Gourd Cucumber
No Photos Available 		Melon
No Photos Available 		Summer Squash Winter Squash Watermelon
No Photos Available
 

Viruses

Viruses:crown, vines, petioles

Crown area symptoms present


Symptoms shown on pumpkin

 See symptoms on :
Pumpkin & Gourd
No Photos Available 		Cucumber Melon
No Photos Available 		Summer Squash
 Winter Squash
No Photos Available 		Watermelon
No Photos Available
 

Miscellaneous

Root knot nematode:crown, vines, petioles

Wilt & general plant decline symptoms

PHOTO

Symptoms shown on pumpkin

 See symptoms on
Pumpkin & Gourd
No Photos Available		 Cucumber
No Photos Available 		Melon
No Photos Available 		Summer Squash
No Photos Available 		Winter Squash
No Photos Available 		Watermelon
No Photos Available
Wilting occurs on hot days. Plants stunted. Elongated and round swellings on roots. Localized occurrence in region.