That condition is known as sun scald. Late Blight. Late blight can affect tomato plants at any point in the growing season and at any stage of growth.
Symptoms appears at the edge of tomato leaves, with dark, damaged plant tissue that spreads through the leaves toward the stem. White mildew may grow on the lower leaf surface of the affected area. This type of blight progresses rapidly through plants in humid conditions, 3 and if left untreated, can spread to fruits.
Septoria Leaf Spot. Like early blight, the first symptoms of septoria leaf spot often begin on the lowest leaves of plants after fruits appear. Rather than showing as a few lesions per leaf, septoria leaf spot appears as many tiny, brown spots on leaves. Lesions continue to grow and spread before causing leaves to fall off. There's a chance that your infection came from another local source, or that your plants' infection will affect others in close proximity.
If you suspect that your tomatoes or potatoes have become infected by late blight, your best course of action is to treat the plants as promptly as possible in order to prevent the disease from spreading. Start by tending to the infected plants, taking care to remove any diseased leaves, stems, or fruit.
Be sure to dispose of the scraps—composting may only further spread the infection throughout your garden. Once you've removed all visual signs of the infection, apply a copper-based fungicide to the plants weekly in an attempt to dissuade the late blight from spreading or returning. At the end of your harvest, completely remove the plants, their scraps, and the surrounding soil from your garden.
Start anew with fresh seeds and soil the following year to guarantee the health of your next crop. There are also several steps you can follow to prevent late blight from taking ahold of your garden in the first place. First, look for varietals of plants that are resistant to late blight—Crimson Crush and Mountain Magic are just two types of tomatoes known to resist the disease.
Additionally, blight thrives in a humid, wet environment. Water your plants early on in the day so they have time to dry out in the warm sun more quickly. Take care to help your tomato plates grow off the ground by using stakes or cages, and, if possible, choose a spot in your garden for the plants that are sheltered from the wind, which can help protect them from blight spores that have blown from neighboring gardens.
The good news: Late blight cannot infect humans, so depending on when you're able to salvage your tomatoes or potatoes, they are safe to eat. If blight lesions are evident, you can simply cut those parts off the tomato or potato and use them as normal. There are also various chemicals that can be used for early tomato blight control, including products that contain penthiopyrad.
An early sign of late blight is water-soaked spots on the various older leaves of the plants because it tends to attack older leaves first before spreading onto the otherwise delicious fruit of the plants. Many of the strategies to combat early blight and other tomato diseases will also work for late blight, but look into copper-based fungicides and work to combat the disease. Also try to clean up any debris in the garden in the fall to stop the spreading of the disease for the next growing season.
Stay diligent, and you can have plenty of tomatoes to enjoy. Can You Eat Blight Tomatoes? Home Guides Garden Gardening. By Doug Johnson Updated October 20, PDF And what about potatoes? It is important to talk through the situation with family members as quickly as possible—even though it may be hard to do. Next Is organic food really more nutritious? Contact: Susan Nitzke, , nitzke nutrisci. Explore Extension ». County Offices.
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