From Meg McGrath, Long Island Horticultural Research & Extension Center, mtm3@cornell.edu:
Cucurbit downy mildew could start developing in eastern NY earlier than usual this year. Symptoms have already been found on cucumber in southern NJ and MD (estimated date of first occurrence in these crops was 6/16 and 6/19) and on cantaloupe in southern NJ (6/22). Reports are at https://cdm.ipmpipe.org/. Only twice since 2004 has CDM been observed earlier than 6/16 in NJ. Since 2007 when I started keeping records of CDM on Long Island, first occurrence has ranged from 1 day before to 49 days after first occurrence in NJ, averaging 32 days.
Yesterday (6/21) there was a moderate risk of successful spread to southeast NY and low risk for LI.
Keep a watch out for symptoms. If you see, please report here.
More information about CDM management on Cornell Vegetables website.