Source: NCSU COOPERATIVE EXTENSION, 8/24/20

Cucurbit downy mildew, caused by the oomycete pathogen Pseudoperonospora cubensis, has been confirmed on a pumpkin sample from a production field in Surry County on August 21, 2020. This is the first report of clade 1 P. cubensis isolates in North Carolina. Small, circular chlorotic lesions on the upper surface of the leaves and gray sporulation on the underside were symptoms and signs observed of CDM in pumpkin (Figure 1). For confirmation, sporangia typical of P. cubensis were observed on the underside of the leaf using a dissecting microscope (Figure 2).

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