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What fungicide works well to control early blight in tomatoes?
Early blight in tomatoes is a constant worry for growers. So if a tomato plant gets early blight, what fungicide should be sprayed and how should it be controlled? Early blight in tomatoes occurs in northeast China, north China, east China, southwest China and other regions; the most important feature is that whether the disease spots appear on fruit, leaves or the main stem, they all have obvious concentric rings, so it is also called ring spot disease. Fruit spots are mainly near the fruit stalk, stem spots are often at the branching points, and leaf spots occur on the leaf mesophyll. A few key points are summarized below, let's take a look. <p style="text-align: center;"></p> <p style="text-indent:2em;"><span style="color:#FF8C00">1. Symptoms of early blight</span></p> <p style="text-indent:2em;">Tomato early blight mainly harms leaves, but can also harm seedlings, stems and fruit. When seedlings are infected, dark brown spots appear at the base of the stem, slightly sunken with concentric rings. When leaves of mature plants are damaged, it mostly develops from the lower leaves upward. It first appears as water-soaked dark green spots, which after expanding become round or irregular ring-patterned spots. The edges often have a light green or yellow halo, and the center shows concentric rings. When humid, black mold grows on the spots, and in severe cases the leaves fall off.</p> <p style="text-indent:2em;"><span style="color:#FF8C00">2. Occurrence pattern of early blight</span></p> <p style="text-indent:2em;">Tomato early blight is caused by infection by Alternaria solani. The pathogen can overwinter in soil or on seeds, spreads through wind and rain, and invades through stomata, lenticels, wounds or the epidermis, causing disease. The pathogen can infect repeatedly in the field, and the disease is severe during the peak fruiting period. When the temperature is 20 degrees, relative humidity is above 80 percent, or in rainy weather, the disease tends to become epidemic. Continuous cropping land, low-lying land, excessive watering or poorly ventilated plots suffer severe disease.</p> <p style="text-align: center;"></p> <p style="text-indent:2em;"><span style="color:#FF8C00">3. Control of early blight</span></p> <p style="text-indent:2em;"><span style="color:#008080">1. Chemical control of early blight</span></p> <p style="text-indent:2em;">In the early stage of disease, promptly remove diseased leaves, diseased fruit and severely diseased branches, and begin spraying fungicides. To prevent resistance and improve prevention, it is recommended to rotate, alternate or use mixed formulations, spraying once a week for three consecutive sprays. When the disease is severe, remove the central diseased plants and diseased leaves, and promptly adopt a control method combining Chinese and Western approaches.</p> <p style="text-indent:2em;"><span style="color:#008080">2. Agricultural control of early blight</span></p> <p style="text-indent:2em;">(1) Grow strong seedlings: adjust the temperature and humidity of the seedbed well, and separate the seedlings when they reach the two-leaf-one-heart stage, being careful to prevent the seedlings from becoming leggy. This can prevent disease during the seedling stage.</p> <p style="text-indent:2em;">(2) Crop rotation: tomatoes should be grown in a three-year rotation with non-solanaceous crops. Strengthen management: adopt high-ridge cultivation, fertilize reasonably, and after transplanting and seedling recovery, close the rows promptly to promote the growth of new roots. In greenhouses, control temperature and humidity well, and strengthen ventilation management.</p> <p style="text-align: center;"></p> <p style="text-indent:2em;">The above is what the Tuliu.com editor has brought you about what fungicide to spray for tomato early blight. We hope it is helpful to farmers. If you have any questions, you can leave a comment below, and I will reply to everyone promptly. See you next time.</p> <p style="text-indent:2em;"> </p>
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What to Do When Muskmelon Gets Powdery Mildew? Disease Conditions and Control Methods
Muskmelon powdery mildew is one of the important diseases harming melon production; it can reduce the plant's photosynthetic capacity, cause premature aging, and even death, seriously affecting the yield and quality of melons. It occurs severely in both spring and autumn, with a relatively high incidence rate. Below is an introduction to muskmelon
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What to Do When Wheat Gets Root Rot? A Detailed Guide to Prevention and Control Methods
First, select root rot-resistant varieties suitable for the local area; second, apply compost fermented with enzyme bacteria or decomposed organic fertilizer; then, after the wheat harvest, plow and clear the stubble, and at the same time rotate with potatoes, rapeseed, and other crops. In addition, sowing at the right time is also very important. 1. Wheat
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What diseases does chlorothalonil mainly control? A detailed explanation of its targets and fungicidal spectrum
Chlorothalonil mainly controls fungal diseases such as blast disease, leaf rust, leaf spot, peanut rust, brown spot, black spot, and downy mildew. Suitable crops include grapevines, pear trees, apple trees, jujube trees, persimmon trees, tomatoes, cucumbers, wheat, rice, cabbage, and others. When
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What to Do If a Peach Tree Gets Peach Leaf Curl? A Detailed Guide to Prevention and Control Methods
Agricultural Prevention and Control of Peach Leaf Curl When establishing a new peach orchard, choose varieties that are both high-yielding and high-quality as well as disease-resistant. For peach orchards that have entered the fruiting stage, manage soil, fertilizer and water well, prune and shape carefully, and improve ventilation and light conditions. Orchards with severe outbreaks should be top-dressed and irrigated in a timely manner, and sprayed with Guaguo Zhuangdiling to thicken the nutrient transport vessels, strengthen tree vigor and improve disease resistance. In April and May, in conjunction with growth-period pruning and control of peach red-necked longhorn beetle larvae, remove any leaves showing leaf curl immediately and burn them in a centralized manner. Spray a 1000-fold dilution of Hushu Jiangjun for sterilization and disinfection, inhibiting the spread and replication of the pathogen.
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What diseases can tebuconazole-azoxystrobin treat? Introduction to its main control targets
Tebuconazole-azoxystrobin is a systemic fungicide with a broad fungicidal spectrum and a relatively long lasting effect, used at the recommended dosage. So what diseases can tebuconazole-azoxystrobin treat? What diseases can tebuconazole-azoxystrobin treat? Tebuconazole-azoxystrobin can effectively prevent leaf and panicle diseases of rice; rice blast,
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What to Do If a Rex Rabbit Gets Rhinitis? Prevention and Treatment Methods
Introduction to Rex rabbit rhinitis: Infectious rhinitis is one of the main infectious diseases of domestic rabbits, with a high incidence rate, strong contagiousness, occurrence in all four seasons, susceptibility in rabbits of all sizes, minimal vaccine effect, difficult drug control, low cure rate, high recurrence rate, long duration of the disease course, and easy worsening and
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What to Do When Bonsai Gets Pests? A Few Practical Control Methods to Teach You
I believe anyone who has kept flowers has encountered this phenomenon: during the plant's growth period, pests appear and leaves turn yellow, especially with plants like pothos, where pest problems are the most serious. So what to do when bonsai gets pests? Method 1, use tobacco water: drop used cigarette butts into a cup of water, wait half
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What to Do When a Money Tree Gets Pests? A Detailed Guide to Pest Control Methods
The money tree is a beautiful plant with an auspicious meaning, and it is also one of the plants that flower lovers prefer to grow. However, if you do not care for it according to the money tree's cultivation methods, it will get pests and diseases, which will affect its ornamental value. So, what should you do when a money tree gets pests? 1.
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What to Do When a Pagoda Tree Gets Pests? A Detailed Guide to Practical Control Methods
The pagoda tree, also known as the Chinese scholar tree, has a tall tree form, and its pinnate compound leaves resemble those of the black locust. Its flowers are pale yellow, can be cooked and eaten, and can also be used as traditional Chinese medicine or dye. Unopened pagoda tree flowers are commonly known as "huaimi" and are a kind of traditional Chinese medicine. So, what should you do when a pagoda tree gets pests? 1. What to do when a pagoda tree gets pests
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