-
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>
-
What herbicide can cleanly kill reeds?
Reeds, as a relatively common perennial grass family plant, are a stubborn presence in the minds of many farmers. It is very difficult to eradicate them in one go, and every time the method is wrong it leads to rampant growth. So choosing a pesticide is also a technical job, so what is the most suitable chemical for spraying reeds
-
Strawberry Anthracnose: Control Methods and Fungicide Recommendations
A few days ago, with nothing to do, I made a special trip to the agricultural university to pick strawberries. Unexpectedly, while picking, all the large berries had already been picked by others, and only some small ones were left hanging. Even among the large berries, all had developed anthracnose. So how do you control strawberry anthracnose? What fungicide is best to spray? 1.
-
What are the taboos in rice seedling bed management?
Sprayers for rice seedling beds must not be used interchangeably. They need to be cleaned thoroughly before each use, and do not spray repeatedly or miss spots. Pesticides that require washing the seedlings must be rinsed off completely. When mixing pesticides, start by diluting the stock solution first, pay attention to controlling the ratio with water, and adjust the concentration. The best time to spray is
-
What is a good specific fungicide for grape leaf blight
At the early stage of the disease, spray 50% Xiaojunling soluble powder at 1500 times dilution, or 1:0.7:200 Bordeaux mixture, or 50% carbendazim wettable powder at 700 times dilution; when the disease is severe, spray once equal-amount 200 times Bordeaux mixture, or 500 times 50% carbendazim, or 600-800 times chlorothalonil, every
-
What are the specific-effective fungicides for grape rachis brown blight?
Before the young buds sprout, spray 3-5 degrees Baumé lime sulfur mixture, or 45% crystalline lime sulfur 30-fold solution, 0.3% sodium pentachlorophenate 1-2 times; before and after flowering, spray 75% chlorothalonil wettable powder 600-800-fold solution, or 70% mancozeb wettable powder 400-600-fold solution, or 40% captan wettable powder
-
What pesticide works well for apple trees in spring
Apple trees can be sprayed with lime sulfur in spring. According to the growth condition of the apple tree, lime sulfur can generally be sprayed about ten days before bud break to prevent pests and diseases. If it is done after bud break, the effect will be weakened. When do apple trees bloom? 1. Apple tree
-
What fungicides work well to control garlic purple blotch?
At the early stage of disease, spray 3% polyoxin water agent at 800 times dilution, or 78% Kebo wettable powder at 500 times dilution, 41.5% prochloraz at 1500 times dilution, 75% chlorothalonil wettable powder at 500-600 times dilution, 50% iprodione wettable powder at 1500 times dilution, once every 7-10 days, for 3-4 consecutive applications.
-
How effective is spraying potassium dihydrogen phosphate on peppers?
Spraying potassium dihydrogen phosphate on peppers promotes flower bud differentiation, increases the fruit-setting rate, promotes fruit cap shedding, improves fruit firmness, and prevents fruit cracking, fruit rot, and fruit drop. It is generally sprayed before flowering, at the young fruit stage, and at the fruit enlargement stage, evenly sprayed on the pepper leaves.
-
What is the best time to spray swelling agents on celtuce?
Celtuce swelling agent can be used from the seedling stage through to the harvest stage. Generally, spray once every 8-10 days. Dissolve each 25 g bag in 15-30 kg of water and spray evenly to wet the leaf surface, or add 1.5-2 bottle caps to every 15-20 kg of water, stir well, and spray-irrigate 0.25-0.5 kg per plant, just until it does not drip.
条件筛选