Why Are My Squash Leaves Getting Yellow?

Identification

• All cucurbits including squash are susceptible to verticillium wilt caused by the Verticillium dahliae fungus. The disease affects the plant's vascular tissues that conduct water and nutrients.

Damage

• The disease is characterized by wilting and yellowing of leaves in the crown area of plants. Affected foliage eventually turns brown and dies. As the fungus spreads, the foliage discoloration spreads outwards towards the tip of stems. Severe infections kill the plant. Cross sectional cuts of roots reveal light brown discoloration.

Management

• Use resistant varieties of squash. Avoid planting the vegetable in areas that were planted with potatoes, peppers, tomatoes or other cucurbits.