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O-zone Injury on Vegetables

Crystal Stewart-Courtens, Extension Vegetable Specialist
Eastern New York Commercial Horticulture

August 22, 2012

O-zone Injury on Vegetables
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


more crops
Asparagus

Asparagus

Beets

Beets

Broccoli

Broccoli

Brussels Sprouts

Brussels Sprouts

Cabbage

Cabbage

Carrots

Carrots

Cauliflower

Cauliflower

Cucumbers

Cucumbers

Dry Beans

Dry Beans

Eggplant

Eggplant

Ethnic Vegetables

Ethnic Vegetables

Garlic

Garlic

Horseradish

Horseradish

Kohlrabi

Kohlrabi

Leeks

Leeks

Lettuce / Leafy Greens

Lettuce / Leafy Greens

Melons

Melons

Mushrooms

Mushrooms

Onions

Onions

Parsnips

Parsnips

Peas

Peas

Peppers

Peppers

Potatoes

Potatoes

Pumpkins / Gourds

Pumpkins / Gourds

Radishes

Radishes

Rhubarb

Rhubarb

Rutabaga

Rutabaga

Snap Beans

Snap Beans

Squash - Summer

Squash - Summer

Squash- Winter

Squash- Winter

Sweet Corn

Sweet Corn

Sweet Potatoes

Sweet Potatoes

Tomatoes

Tomatoes

Turnips

Turnips

more crops
view calendar of events

Upcoming Events

Small Vegetable Workshop

August 13, 2026
Fulton, NY

Identify vegetables that make sense to grow on small acreage, including under high and low tunnel season extension. Bill Ingersoll, owner of Ingersoll Farms, will provide a short tour and discuss other important factors of running a mixed vegetable farm, including a farm stand and selling at farmers' markets.

View Small Vegetable Workshop Details

Chipping Potato and Field Crops Twilight Meeting

Event Offers DEC Credits

August 27, 2026
Dansville, NY

This year, our field meeting is bringing together field crops and chipping potatoes. SWNY Dairy, Livestock, and Field Crops Specialist Katelyn Miller will lead a field crops management discussion. Hear the latest updates in potato disease control and see the Cornell chipping potato variety trial run by Walter De Jong. Dinner follows the educational event.

1.5 DEC credits available in 10, 1a, 21, and 23.

View Chipping Potato and Field Crops Twilight Meeting Details

Announcements

Cornell Crop and Pest Management Guidelines Paused

From Cornell IPM:

Highlighting its commitment to quality and long-term sustainability, Cornell Integrated Pest Management's Pesticide Safety Education Program has announced a pause in production of the 2026 Cornell Crop and Pest Management Guidelines.

Cornell IPM Director Alejandro Calixto said this temporary measure is the result of a comprehensive reimagining process facilitated by Illume Projects of Ithaca, which included end-user interviews, internal surveys and sales data analytics.

"It became clear to us that we cannot continue producing the guidelines and fully restructure them at the same time," Calixto said. "By pausing production, we can dedicate all available resources and time to rebuilding the production process, ensuring that when we re-launch in 2027, the guidelines will reflect a modernized approach built around the grower and other user experience."

A series of annually updated reference manuals produced by Cornell IPM and the College of Agriculture and Life Sciences (CALS), the Cornell Crop and Pest Management Guidelines are widely used by farmers, agronomists, crop consultants and extension educators in New York and throughout the Northeast. They include information about current IPM recommendations, pesticide options, cultural practices, nutrient management, disease, insect and weed identification and resistance-management strategies.

Calixto and Pesticide Safety Education Program Lead Mike Helms will spearhead efforts to restructure the guideline process over the next 12 months, with a goal of launching a more streamlined, user-friendly version in 2027.

Limited copies of the 2025 guidelines remain available for purchase while supplies last through The Cornell Store. The 2026-2027 Greenhouse Guidelines will be available.

For more information contact Helms at mjh14@cornell.edu.


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