Cucurbit downy mildew has been confirmed on pumpkin and butternut squash in New Jersey. Cucurbit downy mildew was confirmed on summer squash in southern New Jersey a few weeks ago and cucumber earlier this season. Remember, some CDM isolates fall into Clade I which predominately infect watermelon, pumpkin, and squash, where other CDM isolates in Clade II predominately infect cucumber and cantaloupe. All cucurbit growers should scout on a regular basis and initiate a weekly CDM fungicide program.
For more information on CDM, the clades, and CDM control please click here.
Cucurbit downy mildew sporulating on the underside of an infected cucumber leaf.
