![]() Spray the entire plant, including the underside of the leaves, with Bonide Liquid Copper Fungicide or use Serenade, Actonovate, or any other Copper Fungicide. Remove the affected leaves, throwing them in the garbage (Do not compost these leaves). Treatment: If the reason for the yellow leaves on the tomato plant is early blight, immediate actions are required before the entire plant is affected. These yellow splotches will progress into brown spots with a yellow circle (called a halo) around them.Įarly blight will continue until the entire leaf is yellow and deformed. It’s a common problem and shows up on the lower, older leaves as irregularly shaped yellow splotches. Locate the raised garden bed away from the shadows of trees and buildings.Ī fungus that lives in the soil causes Early blight and attacks tomato plants early in the growing season. If growing in a raised bed, plant them on the Northside of the bed to not shadow the other plants. You can use a Sunlight Meter to measure the hours of sunlight a location receives before planting the tomato plant. Prevention: Pick the location for the tomato plant wisely. Remove weeds and other plants surrounding the tomato plant so that sunlight can reach the plant’s lower and inner parts. Some cherry tomato plants may survive in around 6 hours of sunlight, but for most large-fruited tomatoes, more than 8 hours of sunlight is ideal. Treatment: Make sure the tomato plant receives at least 8 hours of sunlight. The plant will allow some of the lower leaves to turn yellow and die so the rest of the plant and the developing tomatoes can have enough light to reach maturity. Even if the plant is in full sunlight, the lower leaves may not be receiving enough light and begin to turn yellow. Yellow leaves on tomato plants may indicate the plant is not receiving enough sunlight. The hardening off process gradually exposes the seedlings to the outdoor environment to handle sunlight and temperature difference without any distress. Prevention: Make sure to harden off the seedlings over a 5 to 7 days period. Also, keep the transplants hydrated and provide some shade if the day time temperature is too high. Even though this is not a proven technique, it is popular among home gardeners. Treatment: To revive the recently transplanted tomato seedlings from transplant shock, apply a mixture of 1 tbsp of regular granulated sugar diluted in a half-gallon of water. If the newer leaves at the top of the plant are bright green and growing, but the lower leaves are pale yellow, the plant is just going through a short phase of transplant shock. It is especially true when seedlings are transplanted from a consistently warm indoor location into an outdoor site where the day and night temperatures fluctuate.Īfter a week or two following the transplant, the once-vibrant green leaves on the plant begin to lighten in color, and you’ll notice the leaves turning yellow on tomato plants. When tomato seedlings are transferred into larger outdoor containers or ground, the plants may go through transplant shock. Learn why this situation is causing the yellowing of the tomato plant leaves, how to fix the tomato plant with yellow leaves now, and how to prevent it from re-appearing in the future. Look at the ‘Diagnosis’ column and jump to the corresponding section below. Go through the table below, asking yourself the following questions until you answer ‘Yes’. Still, the plant’s death is imminent unless the source of stress is discovered and corrected. The stress may be caused by you, by the environment, or by pests and diseases. When there are yellow leaves on a tomato plant, it tells you that it is under stress. Since it’s a common problem with several underlying causes, it makes a gardener wonder- why are my tomato plants turning yellow? Why are your tomato plants turning yellow? While tomato plants are easy to grow, most gardeners encounter one issue very frequently – the yellow leaves on the tomato plants. The plants are easy to grow and can be grown in containers on a small balcony or in a garden bed in your backyard. ![]() Tomatoes are the most favorite plant to grow in a home vegetable garden. ![]()
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