Late blight is the least common blight on tomatoes, but it is, by far, the most destructive. Burn everything the fungus may have touched. Fungus spores are spread by splashing water. Black spots on the almost ripened fruit turn into large bruised spots and the fruit begins to fall. Treatment is simple. You should put the stakes in at the time of planting. If you grow tomatoes, you have almost certainly run afoul of the fungus that causes the disease known as early blight. Use either diluted as a spray, or dust the powder onto the foliage, every three days. If so, apply it at fruit set, or just before, and reapply every 7 to 14 days, avoid harvesting your tonatoes within 7 days of application. This ubiquitous tomato disease does not usually kill the plants, but it can greatly reduce your yield. Solutions to the problem include watering at the base of plants and avoiding the garden while foliage is wet. The first is a modern version of the classic Bordeaux Mixture, Bonide® Copper Fungicide Dust, and it’s available from Arbico Organics. These are the most effective ways to prevent it from taking hold in your garden: When you harvest a bumper crop one year, it is so tempting to plant in the same spot the following season. She transitioned to full-time writing in 2009. Treatment is simple. Infected fruits show brown, crusty patches and rot quickly. Tomato plants are used to growing in dry climates, so they are unusually sensitive to water on their leaves, which makes them more prone to fungal infections than many other crops. You can learn more about various types of blights affecting tomatoes here. The fungus overwinters in the soil, and spores can be spread by wind, water, insects, and even on your clothes or shoes. Even if they aren’t showing any symptoms, if one plant has been infected, then it’s likely that the infection has already spread to your other plants. Septoria blight, also called leaf spot, is the most common blight on tomatoes. Avoid watering in late afternoon or evening so that water can evaporate from the leaves and, if possible, water the ground and not the foliage. Sign up for our newsletter. Here is more about what we do. Have you had success battling early blight? And for more information about growing tomatoes in your garden, you’ll need the following guides next: © Ask the Experts, LLC. If you see “EB” listed on tomato seed packets or in catalogs, that stands for “resistant to early blight.” Keep an eye out for this helpful notation when you are searching for resistant varieties. Rotate crops as often as possible and never turn any tomato debris back into the soil. Early blight appears after heavy fruit set. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. There are a number of steps you can take during the growing season – or even before it begins – to limit the damage that this fungus may do to your plants. In the presence of spores, this can help to prevent a fungal infection from getting worse. This is the blight that caused the Great Potato Famine of the 1840s and will quickly infect any potatoes planted nearby. Cracked Fruit on the Vine: Are Split Tomatoes Safe to Eat? The original Bordeaux mixture contained copper sulfate and lime and could sometimes be toxic to plants. Some of these are standard protocols for growing tomatoes, like removing all plant debris at the end of the season, and rotating your crops. Uncredited photos: Shutterstock. Treatment is simple. How to Choose the Best Halloween Pumpkins to Grow in Your Garden, How to Choose the Best Backyard Playground Equipment for Your Home, follow the instructions here to disable notifications, How to Identify and Treat Diseases of Turnips and Rutabagas, How to Grow Black-Eyed Susans, a Garden Favorite, Take the Fuss Out of Verbena: A Growing Guide, Blossom-End Rot: What to Do if Your Tomatoes Rot on the Bottom, The Benefits of Boysenberry: Why You Need this Brambly Hybrid in Your Life, Daylilies in the Garden: Growing a Carefree Perennial. Rings resembling targets develop first on the leaves and cankers soon grow on the stems. All potatoes should be dug and disposed of as should all tomato plants and fruit affected by this tomato blight. Some of these links may be affiliate in nature, meaning we earn small commissions if items are purchased. Using drip irrigation instead of watering from overhead will help to keep your plants dry. Most fungi grow best in the warm, wet dark. Try to avoid working with or around your plants in wet weather. We occasionally link to goods offered by vendors to help the reader find relevant products. After the spores have germinated, lesions can form on infected plants in as little as five days. One of Helga George’s greatest childhood joys was reading about rare and greenhouse plants that would not grow in Delaware. After identification, tomato blight treatment begins with fungicide treatments, although when it comes to tomato blight, solutions really lie in prevention. It attacks in rainy weather with cool nights and quickly infects fruits. What is tomato blight? It is often introduced into gardens via contaminated seed or transplants. Let us know how you fared in the comments. Flea beetles sometimes transmit the pathogen as well as they travel from plant to plant. Cornell University’s Department of Plant Pathology provides an extensive listing of resistant varieties. Part of the reason that there is pretty much no escape from this fungus is that it overwinters in the soil and in infected plant debris. However, don’t wait until your tomatoes are fully grown to stake them. Others are more specific to the problem, like using biofungicides or chemical fungicides to treat the infection. Use fungicides before the fungus appears and they should be applied regularly throughout the season. There are a few treatment options available. Fascinated by the childhood discovery that plants make chemicals to defend themselves, Helga embarked on further academic study and obtained two degrees, studying plant diseases as a plant pathology major. High humidity and temperatures above 75°F cause it to spread rapidly. What is tomato blight? You can learn more about various types of blights affecting tomatoes here. Product photos via Arbico Organics, Bonide, and Serenade. This disease usually progresses from the bottom of the plant to the top.
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