O-zone Injury on Vegetables
Crystal Stewart-Courtens, Extension Vegetable Specialist
Eastern New York Commercial Horticulture

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
2023 Potato Advisory Meeting

December 12, 2023
Canandaigua, NY
This year's Potato Advisory Meeting will include talks from Cornell faculty on insect pest and weed updates, as well as updates from this year's potato variety trials. Following lunch, there will be a round table discussion with fellow potato growers and industry members. DEC credits: 2.0 credits in 10, 1a, 23. This meeting is FREE to attendees and includes lunch!
2024 Finger Lakes Produce Auction Winter Growers Meeting

January 4, 2024
Penn Yan, NY
This annual meeting will present information on insect and disease management in fresh market vegetables in both field and greenhouse (high tunnel) vegetables, primarily for those growing for wholesale auction. Grafting, biological and, where appropriate, conventional spray options will be discussed. Berry production updates will be provided. A general session will include updates from the Food Safety Modernization Act. Judson Reid, Senior Extension Associate with the Cornell Vegetable Program along with CCE staff will instruct participants and facilitate peer-based learnings. DEC recertification credits will be offered.