How is tomato wilt treated? How to treat tomato wilt

Symptoms: The disease mostly occurs during the flowering and fruiting period of tomatoes. The diseased stem has a depression from bottom to top, causing one side of the leaf to turn yellow, brown and die; Some half or half of the leaves turn yellow; When the diseased stem is dissected, the vascular bundles turn brown.

When the humidity is high, a pink mold layer is produced in the diseased area. In severe cases, the whole plant dies.

Prevention and control methods: choose disease-resistant varieties. Such as Dongnong 708, Dongnong 710, Dongnong 712, Hazera R, Baili and so on.

Crop rotation. Crop rotation of more than 3 years can effectively avoid the occurrence of wilt. Pharmaceutical prevention and control.

At the beginning of the disease, spray 500 times of 50% carbendazim wettable powder. In addition, you can also use 10% double-effect Lingshui 200 times liquid to irrigate the roots, 100 ml of liquid per plant, once every 7 10 days, 3 4 times in a row.

Fusarium wilt diseased plants and leaves.

Tomato wilt disease, also known as wilting disease, mostly begins to occur during the flowering and fruiting period. Diseased leaves develop from bottom to top, initially yellowing near the ground, then browning, and gradually scorching. Sometimes only one side of the plant is diseased, and diseased leaves appear one after another, the leaves turn yellow and brown, and one side of the stem appears a depression area from bottom to top, causing one side of the leaf to turn yellow, brown and die; Some of the half or half of the leaf inflorescence turns yellow, and some start from the leaf inflorescence close to the ground of the plant, and gradually spread upward, except for the top few leaves intact, the rest die. The diseased stem is dissected, and the vascular bundles turn brown.

When the humidity is high, a pink mold layer is produced in the diseased area. The course of the disease progresses slowly, usually 15 to 30 days before it dies, and there is no milky mucus outflow, which can be distinguished from bacterial wilt.

1) Spray control.

Before the 3rd instar, corn armyworm was sprayed with 15 45 grams of 20% pyrethrin EC, 50 kg of water, or 1000 1500 times of 5% deltamethrin EC, 1500 2000 times of 40% dimethoate EC, 500 600 times of 40% hydroamidophos EC, 800 times of 5% cypermethrin EC, 10% Avi? 1000 times of high-chlorine EC, 1000 1500 times of deltamethrin EC, 1000 1500 times of cyhalothrin microemulsion, 21% malathion? Fenvalerate EC 1000 times spray.

2) Sprinkle granules.

3% carbofuran granules, dosage per mu 1 2 kg.

Tomato wilt is an important soil-borne disease. It mostly occurs during the flowering and fruiting period and dies at the peak fruiting stage. First from the lower leaves start to yellow and die, then spread upward, sometimes one side of the plant leaves yellow, the other side is normal green, when the disease is serious, the whole leaf dies, but does not fall off.

The leaves are yellow-brown, and when wet, the stem is close to the surface of the ground, producing pink mold, and the vascular bundle of the stem becomes yellow-brown, and there is no milky white mucus flowing out, which is different from bacterial wilt. It can be sprayed with dimetallin, Bacillus subtilis, chlorobromoisocyanuric acid, sodium disulfon, copper ammonia, etc.

Fusarium wilt occurs during the flowering and fruiting period of tomatoes, especially during the fruiting period, which causes the plant to die. At the beginning of the disease, the middle and lower leaves of the plant wilt at noon, but recover in the morning and night. After that, the leaves will gradually turn yellow from the bottom to the top, but they will not fall off, and the plant will slowly die.

It may develop disease on one side of the plant and still grow healthily on the other side.

There are many causes of tomato blight. For example, the soil is heavy and acidic, and it contains certain germs. Or it is due to the presence of nematodes and other pests in the soil, which are transmitted to the plants.

It may also be due to nutrient soil or organic fertilizer carrying bacteria, which is not fully decomposed. In addition, too much nitrogen fertilizer, or continuous rainy weather after sunshine, can also make it easy to suffer from disease.

For blight, the first thing to do is to remove the more severely diseased leaves, so that they do not continue to deteriorate or spread to other parts. The plucked leaves should be burned to completely destroy the germs. Then make a spray with R. solanacear, vofonin and garlic oil, while also irrigating the roots.

If the condition is more severe, thiophanate-methyl needs to be added**.

To prevent tomato wilt, we must first choose varieties with strong disease resistance, and pay attention to crop rotation and stubble, during which weeds should be removed and the soil should be turned deeply. If nutrient soil is used, it needs to be sterilized and put in a sunny place to dry for about three weeks. When transplanting, it is necessary to pay attention to spraying fungi, and in the rainy season, it is necessary to do a good job of drainage, and use well-rotted organic fertilizer for irrigation.

Symptoms: It mainly harms the rhizomes of tomatoes, and most of them begin to develop during the flowering and fruiting period. At the beginning of the disease, only the lower leaves of the plant turn yellow, and then the brown water chestnut wilts dry up, but do not fall off.

prevention and control technologies; 1.Remove weeds in and around the field, concentrate on burning or managing; Deep ploughing of the ground to eliminate stubble, promote the decomposition of diseased residues, and reduce the source of disease and insects.

2.Sterile substrate should be selected for the nutrition of seedlings*.

3.Crop rotation and non-crop rotation.

4.Choose disease-resistant varieties, choose disease-free, coated seeds, 5Seedlings are transplanted, covered with drugs after sowing, and insecticides are sprayed once before transplanting.

6.Choose fields with convenient drainage and irrigation, open drainage ditches, and lower the groundwater level to achieve no water accumulation when the rain stops; After heavy rain, it is an important measure to clean the ditch system in time to prevent moisture retention and reduce the humidity in the field.

7.In the fields with many soil pathogens or serious underground pests, it is necessary to carry out high-temperature stuffy sheds to disinfect the soil and space.

8.The application of well-rotted organic fertilizer or finished organic fertilizer, without bacterial fertilizer, the applied organic fertilizer shall not contain the disease residues of undergraduate crops.

9.Appropriate application of phosphorus and potassium fertilizers, strengthening field management, cultivating strong seedlings, and enhancing plant disease resistance are conducive to reducing diseases.

10.Timely control of pests, reduce plant wounds, and reduce the transmission route of germs.

12.For tomatoes cultivated in greenhouses, the greenhouses are closed in summer when the temperature is high and humidity, and the tuyere is blocked for two weeks, and the high temperature is stuffy to kill most of the pathogenic bacteria.

13.Pharmacological prevention.