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Herbicide Injury

Disorderalso: Herbicide drift, Spray drift

Damage to garden plants from weed killers that drift in on the wind, vaporize from a neighbor lawn or field, or linger in mulch, manure, or compost. Tomatoes, peppers, beans, and grapes are especially sensitive, and growth-regulator herbicides like 2,4-D and dicamba cause the classic twisted, distorted growth that is often mistaken for a disease.

🔎 How to spot it

Look for new growth that is twisted, cupped, curled, or strap-shaped, with stems and leaf stalks that bend and twist downward, and leaves that are narrow, fan-veined, or fern-like, all without any spots, mold, or insects. Tomatoes show extreme distortion and stunting of the growing tips. Symptoms appear over days to a couple of weeks and concentrate on the newest growth.

🥀 Damage it causes

Growth-regulator herbicides distort and stunt the plant, twisting stems and malforming leaves, and in severe cases stunt or kill it and prevent fruit set. Even plants that recover are slowed and may fruit late. Contaminated mulch, manure, or compost can stunt a whole bed, and grapes and tomatoes are damaged by surprisingly small doses.

🔬 What causes it

Herbicide injury comes from weed killers reaching plants they were not meant for: spray drifting on the wind, vapor drift as low-volatility products evaporate in heat, root uptake from a treated lawn nearby, or persistent herbicides carried in hay, manure, compost, grass clippings, or bagged mulch. Growth-regulator types such as 2,4-D, dicamba, and aminopyralid cause the distinctive twisting at very low doses.

🛡️ Prevent it

Do not spray weed killers on windy or hot days, and keep them far from the vegetable garden, using a dedicated sprayer for herbicides only. Ask neighbors and lawn services about timing, and shield sensitive plants. Be cautious with manure, compost, hay, and clippings from unknown sources, since persistent herbicides can survive composting, and let suspect materials age or test them on a few plants first.

🧯 If it is already here

There is no antidote, so keep affected plants watered and lightly fed and give them time, since plants that were only drifted on, not directly sprayed, often grow out of it over several weeks, just more slowly. Remove plants too badly distorted to recover, and do not eat fruit from plants with significant injury. Identify and remove the source, such as contaminated mulch, before it affects more plants.

💡 Good to know

The telltale sign of growth-regulator herbicide injury is the twisting, cupping, and fern-like distortion of new growth with no spots, mold, or pests, which sets it apart from a virus or disease. A baffling, gardenwide case of distorted tomatoes often traces back to contaminated manure, compost, or straw mulch rather than spray drift, so consider what was recently added to the soil.

🌱 Plants it affects

714 plants in the library can be affected by this problem

Acorn SquashAdirondack Blue PotatoAdzuki BeanAfrican Blue BasilAfrican MarigoldAgapanthusAgeratumAgrimonyAji Amarillo Pepper🍓Albion StrawberryAlice du Pont Mandevilla🥔All Blue PotatoAlmondAloe VeraAmbrosia CornAmerican BasswoodAmerican Beauty Dragon FruitAmerican BeechAmerican PersimmonAmethyst Falls WisteriaAmish Paste TomatoAnaheim PepperAnemoneAngelique TulipAngeloniaAniseAnise HyssopAnjou PearAnnabelle Smooth HydrangeaAnnual VincaApeldoorn TulipApple MintApril Tryst CamelliaArbequina OliveArizona Sun Blanket FlowerArkin CarambolaArmenian CucumberAroniaArp RosemaryArugulaAshwagandhaAsian PearAsian PersimmonAtemoyaAtlantic Giant Pumpkin🥕Atomic Red CarrotAucubaAugust Beauty GardeniaAunt Molly's Ground CherryAutumn Joy SedumAvocadoBachelor's ButtonBalsam FirBalsam PoplarBanana PepperBarbara Karst BougainvilleaBartlett PearBay LaurelBayberryBeach PlumBeauregard Sweet PotatoBecky Shasta DaisyBee Balm🍅Beefmaster TomatoBenarys Giant ZinniaBengal Tiger CannaBetter Boy Tomato🥬Bibb Lettuce🍅Big Beef TomatoBig Boy TomatoBilberryBing CherryBitter MelonBlack BeanBlack Beauty EggplantBlack Beauty ZucchiniBlack Beluga LentilBlack Cherry TomatoBlack CrowberryBlack Currant🍉Black Diamond WatermelonBlack Kabouli ChickpeaBlack Krim TomatoBlack RaspberryBlack Sapote🥬Black Seeded Simpson Lettuce🥕Black Spanish RadishBlack Tartarian CherryBlack WalnutBlack-Eyed PeaBlack-eyed Susan VineBlood OrangeBloomsdale SpinachBlue Bird DelphiniumBlue Bird Rose of SharonBlue FescueBlue Lake Green BeanBluecrop BlueberryBocking 14 ComfreyBok Choy

For educational and informational purposes only. Disease management advice is general guidance drawn from university cooperative extension sources; always identify a problem positively and read and follow the label on any product before use, especially around food crops, children, and pets.