Andy Wyenandt

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

September 16, 2022

Cucurbit Downy Mildew Alert – 9/16/22 – Pumpkin and Butternut Squash

Cucurbit downy mildew has been confirmed on pumpkin and butternut squash in New Jersey. Cucurbit downy mildew was confirmed on summer squash in southern New Jersey a few weeks ago and cucumber earlier this season.  Remember, some CDM isolates fall into Clade I which predominately infect watermelon, pumpkin, and squash, where other CDM isolates in Clade II predominately infect cucumber and cantaloupe. All cucurbit growers should scout on a regular basis and initiate a weekly CDM fungicide program.

For more information on CDM, the clades, and CDM control please click here.

Infected leaf

Cucurbit downy mildew sporulating on the underside of an infected cucumber leaf.

Filed Under: Vegetable Crops Tagged With:
September 3, 2022

Cucurbit Downy Mildew Alert – 9/3/22

Cucurbit downy mildew has been confirmed on summer squash in southern New Jersey. This is the first report of CDM on summer squash in the state this growing season. CDM was also confirmed in watermelon on Long Island this week.  Remember, some CDM isolates fall into Clade I which predominately infect watermelon, pumpkin, and squash, where other CDM isolates in Clade II predominately infect cucumber and cantaloupe. All cucurbit growers should scout on a regular basis and initiate a weekly CDM fungicide program.

For more information on CDM, the clades, and CDM control please click here.

Mildew on leaf

Cucurbit downy mildew sporulating on the underside of an infected cucumber leaf.

Filed Under: Vegetable Crops Tagged With:
August 9, 2022

Pepper anthracnose ALERT: 08-09-22

Pepper anthracnose has been confirmed in southern New Jersey. For more information on its control please click here.

Filed Under: Vegetable Crops
August 8, 2022

Vegetable Disease Update: 08-08-22

Filed Under: Vegetable Crops Tagged With: , , , ,
July 29, 2022

Basil downy mildew found in southern New Jersey – ALERT 7/29/22

Basil downy mildew has been confirmed in field grown basil in southern New Jersey. This is the first confirmed report of BDM in the state this growing season. To date, there have been very few reports of BDM in the mid-Atlantic and Northeast regions this growing season. The extremely, hot dry weather these past three to four weeks have not been ideal for its development. However, all basil growers are encouraged to scout their fields or greenhouses on a daily basis and should consider initiating a preventative fungicide program. [Read more…]

Filed Under: Organic Production, Vegetable Crops Tagged With:
July 29, 2022

Vegetable Disease Update: 07-29-22

  • Basil downy mildew has been confirmed in New Jersey. All basil growers are encouraged to scout on a daily basis. To track and report BDM occurrence please click here. For information on the control of BDM in the greenhouse or the field please click on the hyperlinks.
  • Cucurbit downy mildew has been reported ONLY on cucumber in southern, central, and northern New Jersey. For more information on CDM control please click here. To follow the progress of CDM in the US please click here.
  • Bacterial leaf spot has been reported in pepper. More more information on BLS control please click here.
  • Phomopsis leaf blight has been reported in annual strawberry. For more information please see this Extension publication by Louws et al. at NCSU.
  • Collar rot has been reported in tomato. Please click here for more information.
  • There have been no reports of Late blight in potato or tomato in the region to date. To follow the progress of Late blight in the US please click here.
  • Rhizoctonia root rot has been reported in summer squash. Click here for more information.
  • White mold has been reported in tomato and Southern blight in pepper in southern new Jersey this past week. Click here for more information.
  • Powdery mildew has been reported in cucurbit crops. For more information on the control of CPM please click here.
  • Bacterial canker has been reported in tomato. For more information on diagnosing important tomato diseases please click here.
  • Phytophthora blight has been reported on pepper. For more information please click here.
  • The 2022/2023 Commercial Vegetable Production Recommendations Guide is available for free online or for sale in hardcopy form at many County offices.
  • For a quick review on managing fungicide resistance development using tank mixes and fungicide rotations, and information on FRAC group 4, FRAC group 7, and FRAC group 3 and FRAC group 11 fungicides please click on hyperlinks.
Filed Under: Vegetable Crops Tagged With: , , , ,