“Conditions have been favourable for infection by Didymella bryoniae, the causative agent of Gummy Stem Blight. Look for hot spots of stems with oozing lesions, and for distinctive patterns on the skin of butternut squash.” “Powdery mildew pressure remains high. Infection with powdery mildew can reduce fruit quality including poor internal colour development, and infection of […]
Cornell University’s Long Island Horticultural Research and Extension Center added a new photo gallery of Gummy stem blight and black rot of cucurbits. Frequent rain and overhead irrigation done when foliage won’t dry promptly (such as when irrigation ends after sunset) promote disease development. Infection occurs when warm (64-82 C), with 75-77 being optimal. Continue […]
Gummy stem blight (GSB), also known as black rot, is a common issue for watermelon producers in the Southeast. Didymella bryoniae, the fungus that causes GSB, favors warm and humid weather, leaving the Southeast growing region susceptible to the disease’s devastating effects. If not managed well, it can cause significant yield loss for growers. Currently labeled […]
University of Florida presenters at the Florida Ag Expo in November discussed control Downy Mildew, Powdery Mildew, and Gummy Stem Blight on Cucurbits.
CucCAP plant breeder, Todd Wehner talks about breeding cucumber and watermelon varieties for disease resistance.
Watermelon rootstock knocks out disease, pests
Gummy stem blight (GSB) and fusarium wilt (FW) can be common problems for watermelon producers in the Southeast. These two diseases are caused by fungal pathogens from the same taxonomic subphylum, but that is where the similarities end. GSB tends to be more of a foliar pathogen that can move to the petioles and vines, […]
The Vegetable and Specialty Crop News June 2019 edition features two articles about disease problems of interest to cucurbit growers. An article from Florida State Cooperative Extension Vegetable Pathology titled, What to do about watermelon gummy stem blight and fusarium wilt, highlights two disease priorities on watermelon. The need for new virus resistant squash and melon […]