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Vegetable Disease Update – 7/6/17

Cucurbit downy mildew has been confirmed on cucumber in 2 counties in southern New Jersey. All cucumber growers should consider adding downy mildew specific products to their regular maintenance programs.
Basil downy mildew has been reported in central New Jersey.
Late blight has been reported in areas outside the mid-Atlantic region this past week. There have been no new reports of Late blight on tomato or potato in our region in the past week.
Dickeya dianthicola has been found in potato in Australia.
Surveying for Dickeya dianthicola in potato fields and irrigation sources in NJ is currently on-going. If you suspect Dickeya, please contact your county agent. The best method for controlling Dickeya dianthicola in your operation is to adopt a zero-tolerance policy.

June 28, 2017 Andy Wyenandt

Bacterial leaf spot has been reported in pepper and cucumber.
Cucurbit downy mildew has been confirmed on cucumber in New Jersey.
Basil downy mildew has been reported in central New Jersey.
There have been no new reports of Late blight on tomato or potato in the past week.

July 19, 2016 Andy Wyenandt

Asparagus rust has been reported. All growers with nursery, 1-, or 2 yr-old plantings should scout regularly and apply a protectant fungicide if one hasn’t initiated fungicide program to date.
Bacterial leaf spot in pepper has been reported in southern New Jersey.
Cucurbit downy mildew has been confirmed on cucumber in New Jersey. All cucurbit growers need to scout on a regular basis. All cucumber growers need to add a downy mildew-specific fungicide to their weekly fungicide programs.
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.
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 10, 2016 Andy Wyenandt

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.

June 30, 2016 Andy Wyenandt

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.

Dickeya sp., an aggressive form of Black leg, has been confirmed on potato in New Jersey in 2016. Symptoms of Dickeya infection look similar to Black leg infection and can cause significant rot above ground (stems and foliage) and below ground (tubers). All potato growers should scout on a regular basis and report any suspect plants or fields.
There have been no new reports of cucurbit downy mildew.
With the cool, prolonged wet weather, basil downy mildew may become active in greenhouses or high tunnels that have been closed up to retain heat. Appropriate venting to keep relative humidity low and leaf wetness to a minimum is critically important to keep the pathogen from sporulating and spreading rapidly.