Cucurbit downy mildew has been confirmed on cucumber near Cedarville in Cumberland County, New Jersey. This is the first report of cucurbit downy mildew this growing season. All cucumber growers who have not included a downy mildew-specific fungicide in their weekly spray program should do so. For more in formation on controlling cucurbit downy mildew please see the 2016 Mid-Atlantic Commercial Vegetable Production Recommendations Guide.
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July 11, 2016 Andy Wyenandt
Cucurbit downy mildew confirmed on cucumber in Southern New Jersey – ALERT – 7/11/16
July 11, 2016 Andy Wyenandt
Dickeya dianthicola affecting potato growers throughout Mid-Atlantic region and elsewhere – Updated 7/11/16
In addition to Dickeya dianthicola being found in ‘Superior’, ‘Reba’, ‘Snowden’, and ‘Norwis’ on 3 farms in New Jersey this year, the pathogen has also been detected in fields with seed originating from Maine on 5 farms on Long Island in ‘Reba’, ‘Vivialdi’, ‘Superior’, ‘Norwis’, and ‘Waneta’. Other varieties such as ‘Yukon Gold’ have also tested positive for Dickeya. The pathogen has been detected in MA, DE, PA, MD, VA, NC, WV, and FL this summer on seed from Maine and New Brunswick, Canada (NJ and VA). Maine potatoes are currently shipped to over 20 states across the country (CA, CT, DE, FL, ID, IN, KY, MD, MA, MS, NH, NJ, NY, NC, OH, PA, RI, TN, VT, VA, WA, WV, and WI). Potato growers, crop consultants, and Extension personnel in states which grow Maine potatoes should remain vigilant by scouting their fields for Dickeya symptoms on a regular basis and by submitting any suspect samples for diagnostic testing. Dickeya dianthicola has been detected in the US in the past, and because of this, APHIS just recently announced that the pathogen has been designated as a non-reportable/non-actionable pathogen despite its potential to cause 100% crop loss. A link to the USDA/APHIS website for information on Dickeya dianthicola detection and control can be found here.
For more information on Dickeya please see the following articles posted online – source(s) of information:
Dickeya: A new potato disease – Growing Produce
Blackleg is Once Again Being Observed in Potato Fields Across the Mid-Atlantic Region – Penn State University
Update on Dickeya detections in potato – University of Delaware
Dickeya Blackleg: New potato disease causing major impact. – Cornell University
Watch for Dickeya – a new potato disease – The Ohio State University
High security Aroostook farm advances tater technology. – Maine Potato Board
Slowing Dickeya, other pathogens in Canada. – North Dakota State University
Dickeya: A new threat to potato production in North America. – SPUDsmart
Dickeya is coming. – University of Wisconsin/North Dakota State University
Maine ‘Ground Zero’ for new potato disease. – Maine Department of Ag.
Maine seed potato growers looking to protect brand against disease. Maine Department of Ag./Maine Potato Board
July 10, 2016 Andy Wyenandt
Vegetable Disease Briefs – 7/11/16
- Basil downy mildew has been confirmed in southern and central New Jersey. All conventional basil growers should be on a preventative spray program prior to the arrival of the disease.
- Cucurbit downy mildew has been confirmed on cucumber as far north as Caroline County, Maryland and Sussex County, DE this past week. Cucurbit growers need to scout on a daily basis. All cucumber growers need to add a downy mildew-specific fungicide to their weekly fungicide programs.
- Reports of Dickeya dianthicola in potato continue across the east coast. Dickeya dianthicola has been confirmed in 10 states to date on potato seed originating from Maine and New Brunswick, Canada this growing season. All potato growers are encouraged to scout fields and report any suspect plants/tubers.
July 6, 2016 Kris Holmstrom and Joe Ingerson-Mahar
Veg IPM Update: Week Ending 7/06/16
Sweet Corn 
European corn borer (ECB) moth catches remain very low now. Only scattered individuals are now being captured, and growers are managing residual infestations. At the present, the highest adult activity is in Salem county, although it is quite low even there (see ECB map). Larval feeding ranges from single digits to above 20% in areas where IPM personnel are operating. Be sure to begin monitoring plantings for ECB feeding while they are still in the whorl stage. Consider treating when the number of infested plants in a 50 plant sample exceeds 12%. [Read more…]
July 5, 2016 Andy Wyenandt
Dickeya dianthicola affecting potato growers throughout Mid-Atlantic region and elsewhere – Updated 7/11/16
In addition to Dickeya dianthicola being found in ‘Superior’, ‘Reba’, ‘Snowden’, and ‘Norwis’ on 3 farms in New Jersey this year, the pathogen has also been detected in fields with seed originating from Maine on 5 farms on Long Island in ‘Reba’, ‘Vivialdi’, ‘Superior’, ‘Norwis’, and ‘Waneta’. Other varieties such as ‘Yukon Gold’ have also tested positive for Dickeya. The pathogen has been detected in MA, DE, PA, MD, VA, NC, WV, and FL this summer on seed from Maine and New Brunswick, Canada (NJ and VA). Maine potatoes are currently shipped to over 20 states across the country (CA, CT, DE, FL, ID, IN, KY, MD, MA, MS, NH, NJ, NY, NC, OH, PA, RI, TN, VT, VA, WA, WV, and WI). Potato growers, crop consultants, and Extension personnel in states which grow Maine potatoes should remain vigilant by scouting their fields for Dickeya symptoms on a regular basis and by submitting any suspect samples for diagnostic testing. Dickeya dianthicola has been detected in the US in the past, and because of this, APHIS just recently announced that the pathogen has been designated as a non-reportable/non-actionable pathogen despite its potential to cause 100% crop loss. A link to the USDA/APHIS website for information on Dickeya dianthicola detection and control can be found here.
For more information on Dickeya please see the following articles posted online – source(s) of information:
Blackleg is Once Again Being Observed in Potato Fields Across the Mid-Atlantic Region – Penn State University
Update on Dickeya detections in potato – University of Delaware
Dickeya Blackleg: New potato disease causing major impact. – Cornell University
Watch for Dickeya – a new potato disease – The Ohio State University
High security Aroostook farm advances tater technology. – Maine Potato Board
Slowing Dickeya, other pathogens in Canada. – North Dakota State University
Dickeya: A new threat to potato production in North America. – SPUDsmart
Dickeya is coming. – University of Wisconsin/North Dakota State University
Maine ‘Ground Zero’ for new potato disease. – Maine Department of Ag.
Maine seed potato growers looking to protect brand against disease. Maine Department of Ag./Maine Potato Board
June 30, 2016 Andy Wyenandt
Vegetable Disease Briefs – 6/30/16
- Basil downy mildew has been confirmed in southern and central New Jersey.
- Cucurbit downy mildew has been confirmed as far north as Maryland this week.
- Bacterial canker in tomato has been reported.
- Angular leaf spot of cucumber has been reported. Water-soaked lesions similar to cucurbit downy mildew appear on the bottom of the leaves at first. In the case of angular leaf spot, caused by a bacterium, no spores will develop on the underside of leaves.
- Reports and sampling for Dickeya dianthicola in potato across the east coast continue.
