Using tomato stakes and cages also helps keep tomato leaves and tomatoes off the ground and away from potential water or soil-borne contaminants. To prevent blight, you may opt to plant varieties of tomatoes that are specifically blight-resistant. There are also some fungicide products that can be used to treat blight-stricken tomato plants if caught early enough. The mulch prevents fungus and mold from splashing up onto the tomato plants during the watering process. If not tended to, late blight will spread to the tomatoes, themselves.īlight, if caught quickly can be treated by removing affected leaves and adding mulch or straw to the base of the plant. White mildew may also form on the lower leaves. Leaves will brown and yellow, eventually causing damage to the entire plant. Late blight is caused by water mold and first appears on the edges of tomato leaves. The danger of early blight is that it will damage tomato leaves leaving the tomatoes susceptible to too much sun. The first markings appear brown before turning into a bull’s-eye-like shape surrounded by yellowing leaves. Early blight, caused by a soil-borne fungus shows up soon after the first tomatoes appear. In general terms, there are two common types of blight that can cause yellow leaves on tomato plants. This will help the tomato plant focus its energy on growing stronger roots. If you notice some yellowing leaves that you suspect are from transplant shock, try snipping them off. Even if your seedlings are coming from a nursery, it’s a good idea to harden them off in your garden location. With each day, add an hour or two while also exposing them to more and more sunlight. Start by bringing seedlings into a shaded area for an hour or so. You’ll also want to harden off your seedlings by slowly introducing them to external temperatures and sunlight. To prevent transplant shock, be sure to incorporate the same growing media or potting mix used to start your tomato plants into the garden bed or container. ![]() Transplant shock can also be caused by drastic changes in temperature, wind, and sunlight. The shock primarily occurs in the tomato plant roots when new soil environments differ dramatically from the original starter soil. It usually occurs when planting young seedlings into a new garden bed or container. Transplant shockĪ common cause of yellow leaves on tomato plants is transplant shock.
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