Harvest Summer squash is harvested throughout the growing season, while winter squash is harvested at one time. Pick summer squash with elongated fruits when they are less than three inches in diameter and up to eight inches long. Scallop squashes are harvested at three to four inches in diameter. Winter squash should be picked when mature and fruits have hard rinds. Insects, Diseases and Other pests Squash plants are subject to insect pests, mites and diseases.
Later spots dry up and drop out of leaf.
Copper hydroxide, basic copper sulfate. On fruit, sunken spots, pink at first, later turning black. Benomyl, chlorothalonil, copper oxychloride sulfate, basic copper sulfate, maneb or thiophanate-methyl. Downy Mildew Yellow, irregular spots on uppers sides of leaves. Grayish-purple fungus growth on underside of leaves.