Cucurbit powdery mildew (CPM), caused by Podosphaera xanthii, is one the most important diseases of cucurbit crops throughout the world. The pathogen is an obligate parasite, just like cucurbit downy mildew, meaning it needs a living host in order to survive. In northern regions that have a killing frost in the fall the pathogen will […]
Continue reading...July 4, 2023 Andy Wyenandt
Quick reviews of fungicide chemistries, FRAC groups, and fungicide resistance management
Did you know that first EBDC fungicide was registered for use in vegetable crops in 1964 followed by chlorothalonil in 1966. Historically speaking, the first New Jersey Vegetable Production Recommendations Guide was produced in 1969 and was only 33 pages long (it’s 450 pages now). Things have changed significantly over the past 54 years when […]
Continue reading...July 3, 2023 Andy Wyenandt
Diagnosing Verticillium Wilt in Eggplant
Verticillium wilt has been reported in eggplant this summer. It is a common soil-borne fungal pathogen that once it has infested soil can remain for a very long time. Verticillium wilt is caused by either Verticillium albo-atrium or Verticillium dahlia and has a wide host range (over 200 plant species). Both pathogens can survive (overwinter) […]
Continue reading...July 2, 2023 Andy Wyenandt
Cucurbit Downy Mildew Alert – Cucumber – 7/2/23
Cucurbit downy mildew has been confirmed on cucumber in Gloucester County (7/1) and in Atlantic County (6/13) in southern New Jersey. This is the second report of CDM in the state and region this growing season. All cucumber and cantaloupe growers should scout on a daily basis and initiate a preventative fungicide program immediately. All […]
Continue reading...July 2, 2023 Andy Wyenandt
Preparing for Pepper Anthracnose in 2023
Pepper anthracnose caused by Colletotrichum spp. has become a significant problem on some farms in southern New Jersey. Unlike in tomato, where symptoms are only present in mature (red) fruit, pepper anthracnose can infect pepper fruit at any growth stage. Currently, there are no commercially-available bell or non-bell peppers with known resistance to anthracnose.
Continue reading...June 30, 2023 Andy Wyenandt
Vegetable Disease Update: 06-30-23
Cucurbit downy mildew has been reported on cucumber in New Jersey. For more information on CDM control please click here. 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. Bacterial leaf spot has been reported […]
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