Andy Wyenandt

This is an archive of Dr. Wyenandt's posts on the Plant and Pest Advisory.

September 26, 2014

Late blight Found in Cherry Tomato in Cumberland County – 9/26/14

Late blight has been found in small cherry tomato field near Roadstown, NJ today where 100% of the field is affected. This is the third report of Late blight in New Jersey this year and the first since 9/8.

Cool day and night temperatures with prolonged dews are ideal for Late blight development, especially in fields where no protectant fungicides have been applied in recent weeks.

All growers who are still in tomato production should continue to scout on a regular basis and apply protectant fungicides. Abandoned commercial fields, need to be disked under or  sprayed with gramoxone to kill all living tissue. All abandoned organic fields should be disked under or plants should be pulled and discarded.

Filed Under: Vegetable Crops Tagged With: ,
September 8, 2014

Vegetable Disease Briefs – Late blight reported, 9/8/14

  • Late blight was confirmed in an organic cherry tomato field near Lawrenceville, NJ in Mercer County on 9/8. All tomato growers should continue to scout on a daily basis. Weather conditions have been ideal with the heavy, scattered rain and humid conditions over the past few days across much of the state.
  • There have also been scattered reports of late blight have been reported in PA and VA over the past couple weeks.
  • Conditions for downy mildew development on many crops have been ideal this past week with the scattered heavy rains, cooler night temperatures and dewy mornings. Downy mildew has been reported on cucumber, basil, and crucifer crops in our area. Remember, the fungicides recommended for controlling downy mildew are specific and need to be incorporated into weekly maintenance applications.
  • Cucurbit powdery mildew remains active on many cucurbit crops.

 

 

Filed Under: Vegetable Crops Tagged With:
August 25, 2014

Vegetable Disease Briefs – 8/25/14

  • 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.
Filed Under: Vegetable Crops
August 14, 2014

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.

Filed Under: Vegetable Crops
August 10, 2014

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.
Filed Under: Vegetable Crops
July 23, 2014

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.

Filed Under: Vegetable Crops Tagged With: