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2018 Cucurbit Downy Mildew Epidemic History | ipmPIPE & Melcast update

October 7, 2018

Epidemic Updates:

  • October 7: First report from ME. CDM has been confirmed on jack-o-lantern pumpkin in a field in Penobscot County, ME. Incidence is 100%; severity is 80%. Estimated date of first symptoms is September 21.
  • September 26: New report from MS. CDM has been discovered on acorn squash, cucumber, watermelon, cantaloupe, and butternut squash in Copiah County, MS. Incidences vary; severities vary. Estimated dates of first symptoms are September 23 and 25. CDM has also been observed on various hosts in a nearby research plot. Incidences and severities vary; first symptoms observed on September 23.
  • September 21: New report from MS. CDM has been confirmed in George County, MS. Please view the Epidemic History for details.
  • September 19: First report from IA. New reports from AL and SC. CDM has been confirmed in Johnson County, IA; Houston County, AL; and Beaufort County, SC.

Cucurbit Downy Mildew Epidemic History

  • September 7: New reports from NY, OH, and WI; CDM has been reported on cucumber in a 0.2a field in Niagara County, NY. Incidence is 50%, severity is 25%. Estimated date of first symptoms is August 29. CDM has been reported on jack-o-lantern pumpkin in a research plot in Champaign County, OH. Incidence is 100%, severity is 30%. Estimated date of first symptoms is August 28. CDM has been reported on cucumber in a 10a field in Seneca County, OH. Incidence is 100%, severity is 65%. Estimated date of first symptoms is August 25. CDM has been reported on cucumber in the 2a sentinel plot in Waushara County, WI. Incidence is 10%, severity is 80%. Estimated date of first symptoms is September 1.
  • September 4: New report from TN; CDM has been reported on jack-o-lantern pumpkin in a 5a field in Carter County, TN. Incidence is 25%, severity is 25%. Estimated date of first symptoms is August 23.
  • August 31: New reports from TN and SC; CDM has been reported on cucumber in a 1a field in Lawrence County, TN. Incidence is 100%, severity is 20%. Estimated date of first symptoms is August 23. CDM has been reported on cucumber in a 3a field in Aiken County, SC. Incidence is 100%, severity is 40%. Estimated date of first symptoms is August 10.
  • August 28: New reports from KY, NY, OH, NC, and ON; CDM has been reported on cucumber in the sentinel plot in Fayette County, KY. Incidence is unknown, severity is 15%. Estimated date of first symptoms is August 23. CDM has been reported on cucumber in a 90a field in Genessee County, NY. Incidence is 55%, severity is 25%. Estimated date of first symptoms is August 23. CDM has been reported on cucumber in a 0.5a field in Wayne County, OH. Incidence is 10%, severity is 20%. Estimated date of first symptoms is August 21. CDM has been confirmed on squash and pumpkin in a 2a field in Yadkin County, NC. Incidence is 50%, severity is unknown. Estimated date of first symptoms is August 21. CDM has been reported on cucumber in a research plot in Chatham-Kent County, ON. Incidence is 15%, severity is 2%. Estimated date of first symptoms is August 23.

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