When it rains, water hits the ground, splashing soil and spores onto the lower leaves of plants, where the disease shows its earliest symptoms.Early blight symptoms usually begin after the first fruits appear on tomato plants, starting with a few small, brown lesions on the bottom leaves.The surrounding plant tissue turns yellow, then brown before the leaves die and fall off the plant.2 While early blight does not directly affect fruits, the loss of protective foliage can cause damage to fruits due to direct sun exposure.Like early blight, the first symptoms of septoria leaf spot often begin on the lowest leaves of plants after fruits appear.Early blight and septoria leaf spot spores survive the winter in the ground, causing the disease to return next year.1 Late blight does not overwinter in the soil because it requires live tissue to survive, but wind can carry spores up to 30 miles away from infected plants.3. .
How to Prevent Late Blight - Tomato Blight
I left Gardener’s Supply in 2017 to get a master’s degree in ecological landscape design from the Conway School. .
Is It Safe to Eat Tomatoes Infected With Late Blight?
Characterized by large, irregularly-shaped, greasy gray spots (and even soft rot), late blight is a serious plant affliction that led to the Irish Potato Famine in 1845.Not only does the pathogen destroy the fruits of the plant it infects, but it can also spread very quickly and widely, wreaking havoc in your garden if not dealt with promptly and properly.Because it's carried by spores, late blight can travel long distances, often blowing nearby infections to your garden or spreading between your plants.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.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.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.However, it’s still smart to plant your tomatoes in a different section of your garden and to throw away (not compost) all affected foliage and leftover fruits in the fall. .
How to Eradicate Early Blight on Tomatoes (Alternaria)
If you grow tomatoes, you have almost certainly run afoul of the fungus that causes the disease known as early blight.The fungus overwinters in the soil, and spores can be spread by wind, water, insects, and even on your clothes or shoes.It is generally fatal to both tomatoes and potatoes; it can spread for miles, and it was largely responsible for the death of one million Irish people (although the reasons for that famine were highly political and not just agricultural in nature).The first sign that your plants are infected with early blight is usually the appearance of dark brown spots on the lower leaves.As they grow larger, they form concentric rings that resemble a bull’s-eye, and the rest of the leaf gradually turns yellow.The infection starts at the stem end and forms a leathery, dark, sunken area with – you guessed it – concentric rings.Part of the reason that there is pretty much no escape from this fungus is that it overwinters in the soil and in infected plant debris.The lower leaves become infected via contaminated soil – either from direct contact or from rain splashing fungal spores onto the plant.The fungal spores require free water, such as rain or heavy dew, or at least 90% humidity to germinate.When the spores are present in a garden or field, they can be spread by wind, equipment, insect pests, or human contact.Regardless of the cultivar that you have selected, your plants can still be infected with early blight if you do not take precautions to prevent the disease.A popular resistant cultivar is ‘Cloudy Day,’ a hybrid, indeterminate cherry type that produces 4- to 5-ounce fruits.Fortunately, even though tomato plants may not be immune to early blight, you can take measures to minimize the chances of infection.There are a number of steps you can take during the growing season – or even before it begins – to limit the damage that this fungus may do to your plants.You increase the chance of developing an early blight infection if you grow tomato plants in the same place in consecutive years.This is true even if you didn’t see any symptoms of early blight, since the pathogen can start building up without your knowledge.Tomato plants are used to growing in dry climates, so they are unusually sensitive to water on their leaves, which makes them more prone to fungal infections than many other crops. .
How to Repair Soil With Tomato Blight
Early blight is more common in eastern parts of the United States, but it's worth checking troubled plants for the telltale bull's-eye pattern on older leaves no matter where you live.Late blight often appears in any geographic area experiencing unusually cool, rainy periods.Buying blight-resistant plants and rotating crops is a key component of fighting blight, but treating the soil itself can also halt the spread of the disease.Remove all vegetation from the tomato garden bed and other suspected garden areas at the end of the growing season after you detect blight in tomatoes, potatoes or other nightshade plants.Disrupting the soil prevents blight spores from having an undisturbed place to spend the winter.Examine the entire garden in the spring before treating or planting the soil.The mulch cuts down on the chances of blight reaching the plants through splashing mud.Check with your local university extension service, county agent or a trusted area nursery to determine if certain diseases, including blight diseases, are common in your area. .