O-zone Injury on Vegetables
Crystal Stewart-Courtens, Extension Vegetable Specialist
Eastern New York Commercial Horticulture
Hot, humid weather with stagnant air masses may lead to ozone damage on crops. Ozone warnings were recently issued for much of New York. These warnings are intended for people with respiratory problems and let them know they should limit their outdoor activity and try to stay as much as possible in air-conditioned locations. These warning are also a good indicator that ozone damage may occur in plants.
Common ozone symptoms are small, irregular, shaped spots that range in color from dark brown to black (stipple like) or light tan to white (fleck like). These spots are found only on the upper surface of the leaf. Very young and old leaves are less susceptible to ozone while newly mature leaves are the most susceptible. With severe damage, symptoms may extend to the lower leaf surface.
Insect feeding (red spider mite and some leafhoppers) produce flecks on the upper surface of leaves, much like ozone injury. Flecks from insect feeding are usually spread uniformly over the leaf surface while ozone flecks are concentrated in specific areas, usually most pronounced at the leaf tip and along the margins.
The most sensitive crops include: Bean, Broccoli, Muskmelon, Onion, Potato, Radish, Spinach, Sweet Corn, Tomato
Intermediate crops include: Carrot, Endive, Parsley, Parsnip, Turnip
Tolerant crops include: Beet, Cucumber, Lettuce
Upcoming Events
NYS Processing Vegetable Industry Roundtable Meeting
March 18, 2024
Batavia, NY
Processing vegetable industry members who grow, manage, or support crop production for Farm Fresh First/Nortera Foods, Seneca Foods and/or Love Beets, are encouraged to sign-up for the 2024 NYS Processing Vegetable Industry Roundtable! You will:
- Network at this in-person meeting.
- Learn the results of industry-funded research.
- Have a voice in Cornell research and Extension.
- Earn 3.25 DEC pesticide applicator recertification credits
- Earn Certified Crop Advisor Credits
Oswego Muck Onion Growers Pre-Season Meeting: Stop the Rot, Nematodes and SLB Fungicide Resistance
March 20, 2024
Phoenix, NY
Christy Hoepting and Frank Hay will get growers ready for the season with updates on managing Stemphylium Leaf Blight fungicide resistance, progress made towards understanding and managing bacterial bulb rot of onion, and results of the 2023 nematode survey and research project. 2.5 DEC recertification credits will be offered in categories 1A, 10 and 23.
2024 NYS Dry Bean Meeting and Cutting Event
March 22, 2024
Geneva, NY
The NYS Dry Bean Meeting will be paired with the annual Dry Bean Cutting Event again this year! The morning meeting will include presentations on the latest dry bean research in New York, with topics including market updates, white mold management, western bean cutworm management, dry bean variety testing, and incorporating NY dry beans into schools. 1.5 DEC credits will be available in categories 10, 1a, 21, 23. CCA credits will be available too.
The Dry Bean Cutting will follow the meeting and showcase the canned dry beans from the 2023 Dry Bean Variety Trial.