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Summer Squash - Diseases, Pests and Problems





Basic Information



Problem: Squash Bug
Affected Area: Entire Plant

Description: Plants show brown blotches or stunted and distorted growth. Bug is dark to grayish-brown above and paler color underneath.

Control: Plants show brown blotches or stunted and distorted growth. Bug is dark to grayish-brown above and paler color underneath. Control: Pick bugs by hand. They will hide under boards, etc., placed near the plants. * Spray with Rotenone, Pyrethrum or Diazinon. Remove debris so bugs cannot overwinter. * Pesticide use and recommendations for various areas are constantly changing. Check with your County agent for current recommendations.


Problem: Aphids
Affected Area: Leaf and Stem

Description: Small Insects found on new stems and the underside of the leaf. Usually green. They suck fluids from the plant leaving a honey dew substance behind. Leaves turn pale yellow.

Control: Insecticidal soaps or a strong stream of water. Ladybug beetles are natural predators. * Thiodan or Diazinon ? more than one application may be required. A layer of aluminum foil under plants reflects light to underside of leaves and may deter aphids. * Pesticide use and recommendations for various areas are constantly changing. Check with your County agent for current recommendations.


Problem: Blossom-end rot
Affected Area: Fruit

Description: Blossom end of squash is dark and leathery. Hot weather increases susceptibility.

Control: Supply even moisture to plant


Problem: Curly top
Affected Area: Leaf

Description: Leaves curl, plant dies.

Control: Destroy infected plants. Rotate location. Avoid stressing plant by watering evenly and providing adequate fertilizer. Clean up debris in fall.


Problem: Powdery Mildew
Affected Area: Leaf

Description: White powdery substance on leaves.

Control: Use surface or underground watering methods to avoid wetting leaves. Plant resistant varieties. Rotate planting location from year to year.


Problem: Mosaic virus
Affected Area: Leaf and Fruit

Description: Deformed (bumps) and discolored fruit and leaves.

Control: Plant resistant varieties. Control insects. Rotate location.


Problem: Verticillium Wilt
Affected Area: Entire plant

Description: Part of plant turns brown, wilts, and dies. May recover briefly recover briefly, but eventually dies. Brown streaking in vascular tissue.

Control: Destroy infected plants. Rotate the planting location. Clean up debris in fall.






Summer Squash

Tips

Oversized summer squash can be cut in half lengthwise, seeds removed and stuffed and baked or baked without stuffing. They are also good grated for zucchini breads and other baked goods.

 

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