Cucurbit downy mildew (CDM) has been reported on pumpkin in central New Jersey (8/18) and on yellow summer squash and zucchini in southern New Jersey. These are the first reports of CDM on pumpkin and summer squash in the state and region this growing season. All cucurbit growers should scout on a daily basis and initiate a preventative CDM fungicide program immediately. CDM was confirmed on cucumber in New Jersey on 6/19/24. Remember, some CDM isolates fall into Clade I which predominately infect watermelon, pumpkin, and squash, where CDM isolates in Clade II predominately infect cucumber and cantaloupe.
For more information on CDM, the clades, and CDM control please click here.