- Late blight was reported in organic tomato field in southern New Jersey on 8/14. There have been no new reports of late blight in the state this past week.
- Basil downy mildew remains active.
- Pepper anthracnose has flared up in the southern part of the state.
- Phomopsis fruit rot has been found on eggplant in Salem County.
- Conditions for downy mildew development on many crops have been ideal this past week with the cooler temperatures and dewy mornings. Downy mildew has been reported on cucumbers, basil, and crucifer crops. Remember, the fungicides recommended for controlling downy mildew are specific and need to be incorporated into weekly maintenance applications.
August 25, 2014 Andy Wyenandt
Vegetable Disease Briefs – 8/25/14
August 14, 2014 Andy Wyenandt
Late Blight Found on Tomato in Southern NJ – 8/14/14
Late blight was found in an organic tomato field near Bridgeton today, August 14. This is the first report of late blight in New Jersey this growing season.
Weather conditions this past week have been favorable for its development in most of the mid-Atlantic region. All tomato and potato growers in the state should scout their fields on a regular basis. All tomato and potato growers who have not initiated a protectant fungicide program should do so. For more information on controlling late blight please see the 2014 Commercial Vegetable Production Recommendations: Tomato Section, page F205 and Potato Section, page F128.
If you suspect late blight on your farm please contact your County Ag Agent.
August 10, 2014 Andy Wyenandt
Vegetable Disease Briefs – 8/11/14
- Late Blight: There have been scattered reports of late blight in the Northeast region the last few weeks. There have been no reports of late blight in New Jersey to date this summer.
- Cucurbit Powdery and Downy Mildew remain active. All cucurbit growers in the state should include powdery and downy mildew specific fungicides in their weekly maintenance programs. As a reminder, all abandoned fields need to be disced under or sprayed with gramoxone to reduce inoculum pressure.
- Pepper Anthracnose has been reported in some areas. See Mitigating Losses to Pepper Anthracnose for more information on its control.
- Bacterial problems on tomato and pepper continue to be an issue. The dry weather this past week should have helped slow things down, however, heavy rain is expected in the state on Tuesday.
- Results of a Septoria Leaf Spot trial on parsley this summer at RAREC suggest that resistance is beginning to develop to the FRAC code 11 fungicide, Quadris, and are similar to results from a trial last fall (see Controlling Septoria Leaf Spot in Parsley). Parsley growers, particularly in the Vineland area, should consider using fungicides such as Fontelis (penthiopyrad, FRAC code 7) or Merivon (fluxapyroxad + pyraclostrobin, 7 + 11) in weekly rotations.
July 23, 2014 Andy Wyenandt
Late Blight on Tomato in Virginia
Late blight was reported on tomato in Leesburg, Virginia on 7/21. Leesburg is Northwest of Washington, DC. There have been scattered reports of late blight in the region this summer.
This is a good reminder for all tomato and potato growers in New Jersey and surrounding region to scout on a regular basis. No late blight has been reported in New Jersey to date. For more information on late blight and to track its progress in the US please visit USAblight.
July 22, 2014 Andy Wyenandt
Cucurbit Downy Mildew Confirmed in Southern NJ – 7/22/14
Cucurbit downy mildew was confirmed in a 10 acre cucumber field near Rosenhayn in southern New Jersey today.
This is the first report of cucurbit downy mildew in New Jersey this growing season. All commercial cucurbit growers in the state and region should scout their fields on a regular basis. Growers who have not already included downy mildew specific fungicides into their weekly fungicide programs should do so immediately.
Symptoms of cucurbit downy mildew
on cucumber leaf.
If left uncontrolled, cucurbit downy mildew will cause significant losses. For more information on controlling cucurbit downy mildew please see the 2014 Commercial Fungicide Recommendations Guide.
Organic growers can apply copper and other OMRI-labeled products at labeled rates to help suppress downy mildew development under light disease pressure.
July 19, 2014 Andy Wyenandt
Vegetable Diseases of the Week
Southern Blight on Tomato
Note the small, spherical fruiting bodies (sclerotia) developing on the surface of the stem. The sclerotia can survive in the soil for many years without a host.
Southern blight on infected tomato stem.
White Mold on Cabbage
White mold on cabbage producing large, black fruiting bodies (sclerotia). The sclerotia can survive in the soil for many years without a host present.
White Mold on Cabbage
