Vine Crops Cucurbit Fungicide Update – What’s Working? Margaret McGrath, Cornell
McGrath Lab at Long Island Horticultural Research and Extension Center
Margaret McGrath leads the Long Island Horticultural Research and Extension Center at Cornell University. The McGrath Lab and the Smart Lab are both part of the Cornell Vegetable Group.
Resistance to Fungicides in Vegetable Pathogens: Current Situation and Strategies for Managing | Cornell Vegetable Pathology
Multi-fungicide resistance remains a constant concern, exemplified by cucurbit powdery mildew isolates present on Long Island that are resistant to 6 different fungicide chemistries.
New photo gallery: Virus diseases of cucurbits
The Vegetable Pathology group at Cornell’s Long Island Horticultural Research & Extension Center added a new photo gallery to their website. View the photos of symptoms of virus diseases on cucurbits. Cornell vegetable pathology links for Cucurbits Virus diseases of cucurbits
New photo gallery: Phytophthora Blight in Cucurbit Crops
Powdery mildew on watermelon
Podosphaera xanthii Cucurbit powdery mildew is caused worldwide by the fungal pathogens Podosphaera xanthii and Golovinomyces cichoracearum. Podosphaera xanthii is more common¹ and, apparently, may be the only one on cucurbits in North America². Early symptoms of powdery mildew include small, circular, yellow lesions on leaves and petioles. Lesions quickly become covered in white spores and […]
Cornell Vegetables Program
Downy mildew on Squash and Pumpkin
Pseudoperonospora cubensis Downy mildew causes angular, yellow to brown lesions on top of the leaves that are restricted by leaf veins. When conditions are favorable, for example early in the morning when moisture is higher, lesions observed on the underside of the leaf may be covered in dark “down”. This downy growth is masses of […]
