When the temperature is very low in winter, what are the general diseases of cucumbers in greenhouse

There shouldn't be any harm. After all, it's all vegetables.

Cucumber leaves are infected with vine blight, with round or irregularly shaped lesions on the leaves, and some leaves also have brown "V" shaped lesions with many small black dots. Cataplexy is a disease that often occurs in winter and spring. After the onset of the disease, the seedlings were lodging and died.

Newly unearthed seedlings are the most susceptible to disease. Soil compaction and acidification are improved to increase soil loosening and aeration. The principle of medication, fungicides and bactericidal drugs are used alternately, sprayed once every 7 10 days, and sprayed three times in a row.

<> target spot lesions, the color of the two sides of the leaves is similar, the initial stage of the lesion is the size of a needle's eye, the later stage is round and expanded, and the humidity is highIn bacterial horn spot disease, there are white marks formed by white bacterial pus on the back of the leaf, which are clearly distinguishable, and there is no mold layer on both sides. It is easy to occur wilt and disease and dead seedlings, after irrigation, the furrow should be shallow and wet, and the afternoon is ventilated, and the high humidity weather on cloudy and rainy days should not be irrigated. In hot and dry weather, irrigation in the evening reduces the ground temperature and prevents the vines from withering and aging.

Small vines appear after topping;The female flowers are weak, the ovary is small, the size of the melon strips and leaves is not commensurate, the phenomenon of melon is serious, or the melon is more, but the melon is not thrown for a long time. This genus has excessive vegetative growth and inhibited reproductive growth.

The root system cannot grow new roots in this environment, so the nutrients absorbed by the root system are very limited, which can only ensure that the seedlings do not die, but cannot make the aboveground parts grow normally. The excessive growth and development of seedlings was inhibited, which was manifested as short seedlings, small and thin leaves, light color, thin stems, small roots, less new roots, abnormal flower bud differentiation, less flowering, and flower topping phenomenon after planting.

Wood chips are better than beech, tung oil, maple and oakIt is best not to use camphor wood and pine fir species, and they should be fermented with lime water or pre-heated treatmentThere are many lotus trees in the south, which can also be used, and it does not have much effect;In addition to ventilation and humidity, reflective curtains can also be hung on the back wall of the greenhouse to increase the light intensity in the shed, especially at the rear.

Anker, Prik, Syca, Frosturea, Manganese-Zinc, Suppression, Kinredomir and Amisida can be selected. When raising seedlings, use shade nets to cool down and shade the light, and stay away from diseased crops. Before planting, 80 kg of lime nitrogen was applied to the mu in combination with deep ploughing, and the soil was disinfected with 1 ml of insect mite emulsifiable concentrate per square meter mixed with 6 liters of water

Downy mildew is one of the main diseases of cucumber, from the seedling stage to the adult plant stage, the most susceptible period is after the melon is set, the air humidity is high, and the presence of pathogenic bacteria will cause a large occurrence. Prevention and control measures: downy mildew is mainly prevented.

selection of disease-resistant varieties; Control the humidity in the field, remove the old and diseased leaves in time, and ventilate and transmit light. In the later stage of cucumber production, high-temperature stuffy sheds can also be carried out: after watering in the morning on sunny days, the shed is sealed tightly, and the temperature of the cucumber growing point is quickly raised to 42-45 for 2 hours, and then more ventilation is carried out, and management is strengthened.

On the mulch film of the ridge, a planting hole with a diameter of 12 cm and a depth of 10 cm is made according to the plant distance. Before planting seedlings, water some water in the planting hole, and then put the seedlings in the manhole to cover the soil, and after the seedlings are planted, the mulch film around the planting hole is sealed tightly with soil. The depth of planting should be equal to the seedling mound and furrow surface.

If the cucumber seedlings are not very neat, the large seedlings should be planted around the shed, and the small seedlings should be planted in the middle of the shed, so that the growth of the seedlings is basically the same. Cucumber cultivation in greenhouses in early spring, the planting density is generally 4000 plants per mu, the density of early-maturing varieties can be increased to 4500 plants, and the late-maturing varieties should be appropriately reduced.

The first is to apply organic fertilizer, and it must be watered in time after customization, and it is necessary to apply fertilizer in time, and some farmhouse fertilizer can also be used at ordinary times, and the appropriate depth should be selected when planting, and it is necessary to strengthen field management, and it is also necessary to use the whole vine kidnapping method to manage.

Be sure to disinfect the soil in the greenhouse. Then you should also plant cucumbers at the best time, you can also prevent pests and diseases in advance, spray pesticides, and then water and fertilize my cucumbers more at ordinary times, be sure to pay attention to ventilation, moisture, and high temperature.

To achieve timely ventilation, the grass in the ground should be pulled out in time, watered in time, fertilized in time, pest control in time, and adjusted the temperature in the greenhouse in time.

Cucumber downy mildew, gray mold, bacterial horn spot, anthracnose, vine blight. In the past two years, cucumber target spot disease has been very serious, and it is hoped that it will be prevented in advance. The above are common diseases.

Cucumbers grown in greenhouses in winter are particularly susceptible to deformity, so how can we prevent them?

1. Select improved varieties.

There are many varieties of cucumber planted, some species are straight strips, so it is not easy to grow deformities, cucumber varieties should be selected according to the quality of the local land, and it is best to use high-quality cucumber varieties with high disease resistance and high production capacity, and not easy to age. Reduces the production of deformed melons.

2. Do a good job in temperature management.

Cucumbers are suitable for growing at a temperature of 28-30, whether the temperature is too low or too high, the probability of deformed melons increases. Usually, the natural ventilation of the greenhouse should be improved to prevent the temperature from being too high, increase the growth rate of cucumbers, and prevent cucumbers from deforming.

3. Effective fertilization.

During the growth period of cucumbers, sufficient chemical fertilizer should be applied, and more basal fertilizer should be applied and fertilized effectively to prevent deformity of cucumbers. Top dressing is dominated by compound fertilizer, which can effectively control the proportion of light fertilizer fertilizer, and can also fill the nutrient nutrients required for the growth of cucumber according to spraying leaf fertilizers such as potassium dihydrogen phosphate, so as to reduce the production of deformed melon.

4. Eliminate the external factors that hinder the growth of cucumbers.

During the cucumber fruiting period, it is very likely that cucumber growth blockers will occur, so that the melon strips can not be straightened, which is very easy to cause cucumber deformity. Therefore, it is necessary to immediately remove the external factors of the growth of cucumber and melon strips, reduce unnecessary nutrient consumption, and prevent deformed melons.

5. Do a good job in pest control.

The common diseases of cucumber are downy mildew, disease, gray mold, aphids, scale insects, etc., which are very easy to cause deformity of cucumber growth or rot of fruits and vegetables.

Measures to prevent deformity by planting cucumbers in winter.

Early inspection and diligence introductionCarry out inspection as soon as possible before and after the female flowers are blooming, and cut them off immediately once they are found, so as not to interfere with the normal growth of all the fruits on their tops.

1.Adjust temperature, humidity and light. Strictly follow the four-stage temperature change countermeasures for cucumber growth and development to manage the method, temperature control and humidity reduction, and strive to meet the requirements of temperature and environmental humidity for each link of cucumber growth and development, and avoid premature aging; When the light is not enough due to poor temperature, it is necessary to use manpower soft light countermeasures; When hanging vines and falling vines, avoid bruising melon vines; Pick off the yellow leaves and diseased leaves that have no growth effect to ensure the growth of the plants.

2.The secret recipe is to fatten. From the application of bottom fertilizer to ensure that organic fertilizer is the leading, 1 mu of high-quality organic fertilizer 10,000 kg, oil residue 300kg, and light fertilizer to judge the balance of imitation 5:

The ratio of 2:6 is combined with organic fertilizer, and the total yield of organic fertilizer is suitable for 1 mu to be applied around 120kg, and boron fertilizer is appropriately applied at the fruit-bearing stage.

3.Pest control. Spray symptomatic after the disease has developed.

The content of spraying should be suitable, the frequency can not be too much, the second day after spraying should be sprayed 1 time leaf fertilizer, the amount of potassium dihydrogen phosphate + urea solution + ternary compound fertilizer + white sugar + edible vinegar, in order to improve the plant's stress resistance to work, to avoid premature aging of plants.

Cucumbers that are easy to deformify in the greenhouse, often take Sun because of the variety problem, try to choose cucumbers with excellent varieties and stable straight strips for cultivation, and at the same time ensure that the temperature of the chain shed, the temperature is too high or too low, which will lead to cucumber deformity. Pat the argument.

It can be prevented by artificial pollination, spraying some drugs to prevent deformity, watering more, and using some suitable fertilizers.

First of all, it is necessary to ensure the temperature of planting, and in the process of planting, we must pay attention to the temperature of the bend, and we must pay attention to the breathability and humidity, and at the same time, the stuffiness in the mountains can be corrected by artificial means, and then it is also necessary to fertilize in time, and it is necessary to spray some pesticides in time.

To thin the fruit, keep 2-3 leaves for a melon, so that the cucumber has sufficient nutrients**. You can dip the cucumber to make it straight.

1. Sudden cooling in the greenhouse: If the tip of the leaf at the seedling stage droops, the color is emerald green or the edge of the cotyledons turns white and curls upward, it is caused by the sudden cooling in the greenhouse. Therefore, in production, according to weather changes, do a good job of thermal insulation and cold protection, so that the daytime temperature is kept at 22-25, and the night temperature is kept at 15-18.

2. The temperature in the greenhouse is too low: the temperature in the greenhouse is too low, which can make the leaves in the flowering and fruiting stage shrink, the mesophyll thicken, the leaf color is light yellow, dull, and the leaf edge becomes white in severe cases. During this period, the insulation should be strengthened to keep the temperature at 25-29 during the day and 18-22 at night.

The minimum temperature should not be lower than 13 to ensure the normal growth and development of the plant. At the same time, it can be cultivated many times to increase the ground temperature and increase the heat capacity in the greenhouse.

3. The temperature in the greenhouse is too high: if the leaves are curled upwards and the leaf edges are light yellow, it is mostly caused by the high temperature in the shed and the excessive air humidity, which mostly occurs in the early stage of cucumber buds. In terms of management, ventilation should be strengthened, irrigation should be increased, so that the temperature is controlled below 35 rock infiltration, and the humidity is kept at about 75%.

4. High temperature and weak light in the greenhouse: If the leaves become larger and thinner, and the internodes are lengthened, it is mostly caused by high temperature, high humidity and weak light in the shed. At this time, in addition to ventilation and humidity reduction, Zhaohui can also hang reflective curtains on the back wall of the greenhouse to increase the light intensity in the shed, especially at the back.