What is the disease of white hairs growing on the stems of planted tomatoes, and how to treat them?

Tomato cotton blight is one of the main causes of tomato rot, which mostly occurs in the mature green fruit just beginning to color the fruit or near the ripe fruit. On September 17th, Yang sent a message from the farmer's housekeeper user to consult the farmer's expert: "What's the matter with the tomato's thin skin and white hair?"

Let's take a look at what the experts have to say. The antifungicides for cotton blight have better efficacy, including 80% Dasheng WP, 58% mancozeb WP, 72·2% Pulik, 50% Anker, 53% Redomir, 60% Feng WP, 52·5% Inhibitory Water Purification Dispersible Granules, 72% Frost Plague Clear WP, 75% Clothalonil WP, 50% Methyl Frost Copper WP, 72% DuPont Kelu WP, 25% Lyoxystrobin EC, 25% Amicida Suspension Emulsion, 69% Anker manganese-zinc wettable powder. Cotton blight is treated with Ruifan, 1500-2000 times of di-noyylamide, Syngenta Jinlei or 56% azoxystrobin chlorothalonil 600 times, or 58% Ruixin mold manganese-zinc wettable powder 500-600 times.

Cotton blight with methamafrost downy mildewcarb, azoxystrobin, refined metoxystrobin, benzoxystrobin, cyanosazole, enoylmanganese zinc, enoylmorpholine spray.

Agricultural housekeeper knowledge class - tomato cotton blightSymptoms of harmIt is mainly harmful to the fruit and also to the leaves. Fruit disease. At first, light brown spots with smooth surface appear near the top or shoulder of the fruit, sometimes with a little white mold, and then gradually form concentric whorl-like spots, which gradually turn dark brown, and the subcutaneous flesh also turns brown.

When the humidity is high, the diseased fruit grows white mold, and the diseased fruit mostly remains in its original state, does not soften, and is easy to fall off. Blade. Leaf infection can also produce stained brown amorphous lesions, which mostly occur first from the leaf margin, and rapidly expand to the whole leaf to blacken, die, rot, and grow a white mold layer when wet.

Pattern of onset

Climatic factors. The weather conditions of continuous rain, relative humidity above 85%, and an average temperature of 25 30, especially when the temperature rises sharply after the rain, are the most conducive to the epidemic of cotton blight. 7 August is prone to disease during the hot and rainy season.

Cultivation factors. Low-lying vegetable fields, heavy soil, extensive land preparation and management, over-dense planting, and poor field ventilation and light transmittance are all conducive to the epidemic of cotton blight. Overwintering and primary infection sources.

The pathogen is oospores or thick spores that overwinter with the diseased residues, and the disease is caused by rainwater splashing on the fruit near the ground and invading from the peel. Propagation characteristics. The pathogen is transmitted and reinfected through rainwater and irrigation water.

Tomato sclerotinia sclerotinia occurs in the shed tomato, if not prevented in time, it will cause flower and fruit drop, seriously affecting the tomato yield, the following I will introduce the field symptoms and control methods of tomato sclerotinia sclerotinia field symptoms of tomato sclerotinia This disease is mainly harmful to the tomato, leaves and stems of the protected area, the fruit is mostly damaged from the fruit stalk to the fruit spread, the disease part is gray-white to light yellow, the spot grows white hyphae in the later stage of black sclerot, the diseased fruit is soft rot, the stem is infected, gray-white, slightly concave, the late epidermis is longitudinally cracked, the size of the lesion, Shape, length is unequal, the edge is water-stained, there are white hyphae and black sclerotia on the surface and in the diseased stem, the leaves mostly start from the leaf edge, the initial water-soaked shape, dark green, no definite shape of disease spots, white mold grows out in the damp, the leaves are gray-brown and die in the later stage, and a large number of sclerotia are formed in the pith in the later stage of the disease, which is conducive to the onset of disease under the weather conditions of many wind and rain days and high humidity, and the disease is easy to develop and epidemic in the early spring or late autumn protectorate.

It may be that we have powdery mildew, and when we prevent and control it, we should remove the diseased fruits and leaves, and then buy some pesticides to spray on the leaves of tomatoes, so that we can play a role in prevention and control.

It is very likely that the tomato has powdery mildew. If there is a situation of white hair, the value and the leaves should be destroyed, and some pesticides can be sprayed for control.

It may be that there are some pests and diseases, or the sun is not enough, and it is caused by too much soil moisture, you can spray the corresponding pesticides, but also reduce the amount of watering and supplement the light.

It is a kind of powdery mildew, remove the diseased fruits, diseased leaves, try to find clean.

1. Tomato blight: the main disease at the seedling stage, and light brown spider silk mold can be seen in the disease part in the later stage of the disease.

2. Tomato stem base rot: a disease at the adult stage, when the humidity is large after the onset of the disease, light brown arachnoid mold can be seen in the diseased part.

3. Tomato late blight: seedling stage, adult stage, tomato leaves, stems, flowers, fruits can be diseased, the diseased part can be seen to grow white mold when the disease occurs, and the diseased head is easy to rot when the humidity is large.

4. Tomato gray mold: at the seedling stage and adult plant stage, tomato leaves, stems, flowers and fruits can be diseased, and the disease grows gray or gray-brown mold when the humidity is large after the onset.

5. Tomato sclerotinia sclerotinia disease:

At the seedling stage and adult plant stage, tomato leaves, stems, flowers, and fruits can be diseased, and a small amount of white mold has a large amount of white mold for a long time after the onset of disease, and there is a black sclerotia inside the damaged part in the later stage.

6. Tomato Baijuan disease: It mainly harms the seedlings of tomatoes and the stem base at the adult stage, and there are white silky mycelium in the early stage of the disease.

7. Tomato leaf mildew: mainly harm the leaf parts of tomatoes, other parts are also affected, there is a white mold layer on the back of the leaf surface in the early stage, and then it becomes purple-gray, dark gray, black, yellow-brown mold layer

8. Tomato powdery mildew: mainly harms the leaf parts of tomatoes, generally the bottom leaves are the first to develop the disease, and the white powder can be seen on the leaf surface after the disease, and the petioles and stems will grow white pink spots in severe cases.

9. Tomato cotton blight:

It mainly harms the fruit parts of tomatoes, but sometimes the stems and leaves can also be seen to cause disease, and after the onset of the disease, in the case of high humidity, there will be white mold in the diseased part.

This is due to fungal infections with some powdery mildew. It can be sprayed with Bordeaux liquid or carbendazim in proportion to water.

Summary. Hello may be tomato stem base rot: a disease at the adult stage, when the humidity is large after the onset of the disease, light brown arachnoid mold can be seen in the diseased part.

Hello may be tomato stem base rot: a disease at the adult stage, when the humidity is large after the onset of the disease, light brown arachnoid mold can be seen in the diseased part.

How to heal. The agent irrigated the root with 25% pyratan etherstrobin 1200 times + 70% thiophanate-methyl wettable disturbing hall powder 400 times per plant, and then irrigated once after 10 days, 2-3 times in a row.

The above drugs are not available, and there are other alternatives.

Oxazalin and methyl chloritharin can also be used.

It is normal for small tomato seedlings to grow hairy.

Tomato cultivation techniques

Plot selection. You should choose deep soil, good drainage and irrigation, good ventilation and ventilation, and do not plant nightshade vegetables within 2 to 3 years, and do not choose areas without irrigation facilities for cultivation.

Breed selection. Choose varieties that are disease-resistant, high-quality, high-yield, resistant to storage and transportation, have good commerciality, and are suitable for market demand, such as Jintieliang Hanwang, etc.

Sowing seeds and raising seedlings. Sowing time in early March to early April is appropriate, according to the actual local situation reasonable arrangement of sowing time, the use of fertilizer ball way to carry out plastic film and small arch shed seedlings, and with the well-rotted farmhouse fertilizer mixed soil evenly pinched into a fertilizer ball of about 5 cm, and put a seed, evenly arranged with nutrient soil covering, at the same time apply a dilute water, covered with plastic film. Finally, it was covered with a small arch that was 8 meters wide and 8 meters long.

When there are 3** leaves growing, it is necessary to remove the film in time to ventilate and cool down, train the seedlings, and then plant them after a week.

Colonization management. Soil preparation and application of base fertilizer: 15 to 20 days before planting, apply 7 to 8 square meters of well-rotted high-quality circle fertilizer per mu, or 5 to 6 square meters of livestock and poultry will be stacked and fermented with the same amount of acorn straw and then applied 100 to 150 kg of rotting hail sedan car cooked cake fertilizer, using east-west high ridges.

If the greenhouse is cultivated 20 days before planting, the greenhouse is covered with film, and after the film is buckled, the bottom water is filled with ditching to irrigate the soil.

Planting method and density: plant spacing is kept at 50 to 60 cm, row spacing is kept at meters to meters, and 2000 tomato seedlings per mu are planted. At the same time, it is better to plant after 4 p.m. on a sunny day or on a cloudy day, and after planting, it is necessary to water the planting water thoroughly in time, and then water the seedlings once after 3 to 5 days.

Field management. Erection and pruning: when the tomato plant is about 30 cm high, it should be tied to the vine in time, and the "human" herringbone bracket is mostly used to erect the scaffold, and after the bracket is laid, the tomato trunk is fixed on the bracket with a plastic rope in the shape of an inverted figure 8, and a single stalk is used for pruning, each plant retains 5 to 6 spikes of flower spikes, and each spike retains 4 to 5 fruits.

In particular, it is necessary to remove the excess side branches in time and remove deformed fruits, diseased fruits, and excess fruits. In the later stage of growth, the lower old leaves and diseased leaves should be removed in time to reduce nutrient consumption and disease propagation, and enhance ventilation and light transmittance.

Cultivating weeding and cultivating soil: tomato seedlings can be cultivated and weeded after slowing seedlings, cultivating must be shallow and not hurt the roots, at the same time, remember that the tomato should be cultivated 2 to 3 times during the whole growth period.

Fertilizer and water management. Drip irrigation or dark irrigation should be used for watering, and the seedlings should be watered in time after planting, and the seedlings should be watered slowly after 3 to 5 days. The relative moisture of the soil is maintained at 60 to 70 percent in spring and 75 to 85 percent in summer and autumn.

Top dressing in time according to the length of the growing season and growth conditions. After deducting the basal fertilizer part, it is applied with water several times. It is worth noting that it is necessary to resolutely put an end to the use of organic fertilizers that have not been harmlessly treated, and it is advisable to use oil cakes and various biological fertilizers.