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Vegetables
Volume 61 Number 17 Date 08/25/2016


LATE BLIGHT - Cases of late blight have been confirmed by the UW in Dane and Polk counties since August 15. Protective fungicide treatments should be maintained to prevent this disease from developing in tomato and potato crops as harvest continues. Home gardeners, direct marketers and commercial producers who suspect late blight are encouraged to send symptomatic plant material to the UW Plant Disease Diagnostic Clinic for free testing: https://pddc.wisc.edu/sample-collection-and-submission/.

SQUASH BUG - Adults and nymphs are likely to continue feeding on ripening vine crops throughout fall. Although chemical control of squash bugs is less important later in the growing season, cultural controls such as removing plant debris around the garden are useful for eliminating potential winter hibernation sites. Crop rotation is also suggested to reduce the overwintering adult population which can cause damage to transplants and seedlings next spring.

ONION MAGGOT - Third-generation maggots are feeding on cull onions and bulbs left behind in fields. Onion growers are advised to remove all cull piles and thoroughly clean fields this fall to lower potential overwintering populations. Rotation to a non-host crop should also be considered in spring of 2017 if onion fields or plantings experienced onion maggot problems this summer.

-- Krista Hamilton, DATCP Entomologist