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Causes of Yellowing Leaves. Common causes of yellow leaves on tomatoes include cool soil, age-related death of the lower leaves and a myriad of nutritional deficiencies including nitrogen, boron, potassium, iron and magnesium. Leaves may also yellow when affected by fusarium wilt, bacterial wilt or verticillium wilt.
1 If tomatoes are planted close to walnut trees or related species including butternut and pecan, a chemical (juglone) released by these trees will induce wilting of tomatoes. 2  Waterlogged soil. 3  Sometimes when a soil gets waterlogged and the soil temperatures are high, it causes wilting of the plant.y tomato leaves are dying from the bottom of the plant up. One likely cause is early blight. Early blight is a fungus that attacks the tomato leaves and fruit beginning in June in Missouri. A distinguishing characteristic of early blight is the lesions on the leaves and stems.