Xin cảm ơn! Tomato blight, in its different forms, is a disease that attacks a plant’s foliage, stems, and even fruit. Remove and destroy affected plants at the end of the season.Stake tomato plants for better circulation.Mulch with black plastic or landscape fabric to prevent fungus from spreading up onto leaves.Water the soil – not the plants – to prevent splashing.Give tomato plants extra space (more than 24 inches) to let air to move among leaves and keep them dry.Plant tomatoes in a raised bed to improve drainage and prevent diseases from spreading.Plant disease-resistant hybrids to strengthen your plant’s chances of being blight-free.Spores can be dormant in the soil for several years. Other diseases (such as late blight, Septoria leaf spot, and gray leaf spot) can also be controlled by these biofungicides and fungicides, so application is multi-purpose.You may also choose Mancozeb or Maneb, although these have longer wait times before you can harvest tomatoes safely than does chlorothalonil. Some gardeners prefer chemical fungicides, the best of which for tomatoes is chlorothalonil (sold as Fungonil, Daconil, or under other brand names. Or you can treat it organically with a biofungicide like Serenade. You can apply until the leaves are dripping, once a week and after each rain. Treat organically with copper spray, which you can purchase online, at the hardware store, or home improvement center. Treat it as soon as possible and on a schedule. Once blight is present and progresses, it becomes more resistant to biofungicide and fungicide.Remove and destroy infected leaves (be sure to wash your hands afterwards).The best control measure for tomato blight is prevention (see below).How do you control and treat early blight?.It often strikes after a period of heavy rainfall.It’s most evident during early- to mid-season.Fruit can also be affected spots often begin near stem of fruit.Early blight is marked by tell-tale rings. Dark, concentric spots (brown to black), ¼ – ½” in diameter, form on lower leaves and stems.To muddle matters further, early blight is occasionally mistaken for Septoria leaf spot because the two diseases infect tomatoes at the same time. Early blight’s Latin name is sometimes confused with a form of tomato rot, alternaria, a different tomato problem altogether.Leaves may drop, leaving fruit open to sunscald. Early blight (one form of tomato blight) is caused by a fungus, Alternaria solani, which over-winters in the soil and infected plants.Tomato blight, in its different forms, is a disease that attacks a plant’s foliage, stems, and even fruit.
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