Pest problems of cucumber, pumpkin and squash

Powdery mildew

  • Plant varieties that are resistant or tolerant to powdery mildew.
White powdery mildew on leaves of cucurbit plant
Powdery mildew

Virus

  • Plant varieties that are tolerant or resistant to virus.
  • Remove weeds in the field.
Virus symptoms on cucurbit leaves
Virus
White virus growth on squash fruit
Virus on squash fruit

Angular leaf spot and anthracnose

  • Plant resistant varieties.
  • Use drip irrigation to keep leaves dry. Do not work in plants when wet.
  • Remove and destroy or bury infected plants after harvest.
  • Do not plant cucumber, pumpkin, squash or melon in the same location for 2-3 years.
  • Do not save seed from infected plants.
Green leaf with brown spots and holes from angular leaf spot
Angular leaf spot
Anthracnose symptoms on cucurbit leaf
Anthracnose

Squash bug

  • Remove plant debris around garden during garden season and fall.
  • Remove and destroy eggs.
  • Remove or knock off squash bugs into container of soapy water.
  • Trap squash bugs under boards and remove in the morning.
Squash bug infestation on squash leaf
Squash bugs
Squash bug eggs on squash leaf
Squash bug eggs

Squash vine borer

  • Plant butternut squash, cucumbers, melons, and watermelons as they are not normally attacked by squash vine borers.
  • Make a second plant of summer squash in early July.
  • Use yellow pans of water to detect when adult moths are first active
  • Use row covers when adult moths are first active (late June/early June). Leave for 2 weeks and then remove.
  • Remove and destroy plants killed by squash vine borers.
Squash vine borer bug on squash leaf
Adult squash vine borer
Squash vine borer caterpillar causing damage to a squash vine
Squash vine borer caterpillar
Mesh row cover on squash crop to keep out insect pests
Mesh row cover

Michelle Grabowski and Jeff Hahn

Reviewed in 2018

Share this page:

© 2018 Regents of the University of Minnesota. All rights reserved. The University of Minnesota is an equal opportunity educator and employer.