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Vegetables
Volume 62 Number 13 Date 07/27/2017 SQUASH BUG - Home gardeners are reporting increasing squash bug populations on cucumber, summer squash and zucchini. The simplest control is to remove the eggs, nymphs and adults from plants, and submerge the bugs in a bucket of soapy water. Growers are also advised to dispose of dead leaves and other plant material which can harbor large numbers of nymphs. LATE BLIGHT - The state's first case of late blight of the 2017 season has been confirmed on tomato in Waukesha County by UWEX Potato and Vegetable Pathologist Dr. Amanda Gevens. According to the July 26 report, conditions in the state have been favorable for late blight development, and potato and tomato growers should be considering fungicide selections and treatment intervals while continuing to scout for initial disease symptoms. Registered fungicides for late blight in Wisconsin are listed at the UW-Madison Vegetable Pathology website: http://www.plantpath.wisc.edu/wivegdis/pdf/2017/Potato%20Late%20Blight%20Fungicides%202017.pdf SEPTORIA LEAF SPOT - Tomato plants in Columbia, Dane, Green Lake and Sauk counties were diagnosed by the UW Plant Disease Clinic with this common fungal disease. Symptoms are small, circular yellow spots that first appear on the undersides of older, lower leaves after fruit set. As the spots mature, they turn brown or gray and enlarge to about 1 /4 inch in diameter. In the center of the spots are many black fruiting bodies called pycnidia, which cause secondary infections, generally progressing upward on the plant. Heavily infected leaves turn yellow and drop prematurely, leaving fruits exposed and more susceptible to sunscald. Cultural controls include a one-year rotation out of tomato, staking plants to promote air flow, applying mulch around the base of plants to minimize water splash, and eliminating sources of inoculum in the field by removing or destroying tomato debris by deep plowing immediately after harvest. -- Krista Hamilton, DATCP Entomologist 
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