Mostly sunny. Warmer. Highs 62 to 70 above 6000 feet to 69 to 74 below 6000 feet. Areas of winds northwest 15 to 25 mph. Gusts to 40 mph...Becoming 35 mph in the afternoon.
Many gardeners have been puzzled by the sudden wilting and death of tomato plants. Possible causes of wilting include lack of water, vascular wilts, tomato spotted wilt virus, walnut toxicity, or stalk borers. Tomato plants require approximately 1 inch of water per week.
Fungal Infections. Fungal infections are the most likely culprits if your tomato plants have lower leaves that are beginning to wilt and die. The fungus typically flourishes in the moist heat of summer, just as the tomato plants are starting to fruit. Possible fungal infections include Fusarium wilt, early blight, late blight or Septoria leaf spot. Although these each present with different symptoms, all tend to affect the lower leaves first.