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Cucumber leaves showing yellow chlorotic spots and pronounced veining

Downy Mildew Confirmed on Cucumbers in Eastern North Carolina

Downy mildew, caused by the oomycete Pseudoperonospora cubensis, has been identified on cucumber crops in Eastern North Carolina as of June 10, 2025. Disease symptoms were observed in commercial…

Featured image: Cucumber leaf with downy mildew lesions and sporulation under a hand-held microscope for diagnosis (Photo credit: Lina Quesada)

Cucumber Downy Mildew Found in Sampson County in North Carolina

Pseudoperonospora cubensis is responsible for cucurbit downy mildew (CDM), which was detected in Sampson County on cucumbers on June 4, 2024, with a disease incidence of around 5%.On the upper side…

squash leave with disease symptoms

Squash Downy Mildew found in Clayton N.C.

Written by Md Ziaur Rahman Bhuiyan and Lina M. Quesada-Ocampo.Cucurbit downy mildew (CDM) is caused by an obligate oomycete, Pseudoperonospora cubensis. This disease was confirmed on squash in…

underside of cucumber leaf

Cucumber Downy Mildew Found in Lenoir County in North Carolina

Written by Mariana Prieto-Torres and Lina M. Quesada-Ocampo.Pseudoperonospora cubensis is the causal agent of cucurbit downy mildew (CDM). This disease was confirmed on June 20, 2023 in Lenoir County…

Angular, yellow lesions on topside of the leaves that are bound by leaf veins

Cucumber Downy Mildew Found in North Carolina

Written by Mariana Prieto-Torres and Lina M. Quesada-Ocampo.Pseudoperonospora cubensis, the causal agent of cucurbit downy mildew (CDM), was confirmed on cucumbers in Wilson and Sampson Counties on…

CDM symtoms on squash leaf

Squash Downy Mildew Found in North Carolina

Written by Mariana Prieto-Torres, Savithri Purayannur, Mike Adams, and Lina M. Quesada-Ocampo Pseudoperonospora cubensis, the causal agent of cucurbit downy mildew (CDM), was confirmed on butternut…

Leaf with cucumber downy mildew symptoms

Cucumber Downy Mildew Found in North Carolina

Written by Mariana Prieto-Torres, Mike Adams, Dr. Savithri Purayannur, and Dr. Lina M. Quesada-Ocampo. Pseudoperonospora cubensis, the causal agent of cucurbit downy mildew (CDM), was confirmed on…

Pumpkin downy mildew

Pumpkin Downy Mildew Found in Surry County, North Carolina

Written by Lina Quesada-Ocampo and Kimberly D’ArcangeloCucurbit downy mildew, caused by the oomycete pathogen Pseudoperonospora cubensis, has been confirmed on a pumpkin sample from a production…

Cucumber downy mildew

Cucumber Downy Mildew Found in Johnston County

Written by Lina Quesada-Ocampo and Brandon ParkerCucumber downy mildew, caused by the oomycete pathogen Pseudoperonospora cubensis, has been found in a commercial cucumber field in Johnston County.…

Cucumber vine leaves showing yellow mottled spots and green veins

Cucumber Downy Mildew Confirmed in North Carolina | June 2020

Written by Lina Quesada-Ocampo, Kimberly D’Arcangelo, Mike Adams, and Tommy BattsCucumber downy mildew (CDM) was confirmed on a cucumber sample from a production field in Wilson County on June 8 of…