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Close-up of cucurbit downy mildew symptoms on cucumber leaf. Note angular lesions bound by leaf veins (Photo Dr. Lina Quesada, NCSU Vegetable Pathology Lab)

Cucurbit Downy Mildew in FL, GA, and SC

Cucurbit downy mildew, caused by the oomycete Pseudoperonospora cubensis, is a yearly concern for North Carolina cucurbit growers. The disease affects cucurbit crops such as cucumber, watermelon,…

Potted green plant in a small pot with a visible "USDA Organic" tag

Basil Downy Mildew Outbreaks in North Carolina

Several basil growers, homeowners, and garden centers have reported outbreaks of basil downy mildew to the Vegetable Pathology Lab at NC State. Over 100 outbreaks across the United States (US) have…

Figure 1: adaxial side of a cucumber leaf showing downy mildew symptoms (Charles Mitchell, N.C. Cooperative Extension)

Cucurbit Downy Mildew Found in Franklin County, North Carolina

Cucurbit downy mildew was confirmed on a cucumber sample from a commercial field in Franklin County submitted to the Plant Disease and Insect Clinic on June 23 of 2014. Leaves presented approximately…

Fungicide efficacy trial for cucurbit downy mildew control using single products at high and low rates

Control Options for Cucurbit Downy Mildew in North Carolina

Cucurbit downy mildew, caused by the oomycete Pseudoperonospora cubensis, is a yearly concern for North Carolina cucurbit growers. Having the most effective fungicide products at hand to control this…

Cucumber leaf collected from Duplin County, North Carolina on June 8th, 2014, adaxial side. Note angular, chlorotic lesions. In some cases, the lesions have started to turn necrotic and merge into one large infected area. (Emma Wallace, NCSU Vegetable Pat

Cucurbit Downy Mildew Outbreak in Southeastern North Carolina

Written by Emma Wallace and Dr. Lina Quesada-OcampoCucurbit downy mildew was reported today (June 9, 2014) in a commercial cucumber field in Duplin County, North Carolina and confirmed by the Quesada…

Figure 1: Vegetable samples by family or type diagnosed on 2013

What to Expect for Vegetable Diseases in 2014

The Vegetable Pathology lab at NC State works in collaboration with the Plant Disease and Insect Clinic to diagnose vegetable diseases and provide disease management recommendations. We have compiled…

Severe cucurbit downy mildew symptoms on cucumber leaf, note angular shape of yellow lesions. Older lesions turn brown and necrotic and start to coalesce loosing their characteristic angular shape and making the diagnosis difficult (Photo Debbie Roos, NCS

Cucurbit Downy Mildew Moves Towards Western North Carolina

Cucurbit downy mildew has been reported in Haywood, Polk, Ashe, Henderson, and Chatham counties during this past week. Now that cucurbit downy mildew is present in several regions of North Carolina…

Cucurbit downy mildew symptoms in cucumber leaf (Photo Dr. Lina Quesada, NCSU Vegetable Pathology Lab)

Diagnose Cucurbit Downy Mildew in Different Cucurbit Crops

Cucurbit downy mildew has now been reported in Wayne, Nash, Johnston, Franklin, Sampson, Wake, Martin, Hertford, Wilson, New Hanover, Lenoir, Edgecombe, and Rowan counties. Hosts in North Carolina…

Cucurbit downy mildew dark sporulation on back side of cucumber leaf, note angular lesions bound my leaf veins (Photo Lina Quesada, NCSU vegetable pathology)

Pest News: Cucurbit Downy Mildew Found in Sampson, Hertford and Martin Counties

Cucurbit downy mildew was found in cucumber in Sampson, Hertford and Martin counties and in butternut squash in Sampson county in the past five days. Growers should scout their fields twice per week…

Cucurbit downy mildew symptoms on cucumber leaf (Photo Lina Quesada, NCSU vegetable pathology)

Pest News: New Cucurbit Downy Mildew Report in Cucumber From Franklin County and Several Cucurbits in Johnston County

Cucurbit downy mildew was reported on cucumber in Franklin County on June 22nd and on cantaloupe and pumpkin yesterday June 25th, through the Cucurbit downy mildew IPM pipe website. Cucurbit downy…