Slug often appears in the cultivation of bok choy, what are the conditions for the occurrence of bok

It is mainly a mollusk that secretes mucus like snot, leaving this mucus on furniture, walls, food, etc., especially in rural adobe houses in the past. The old people say that it is impossible to fight against slugs, and most of them use a spoon to pick a little salt from the salt shaker and sprinkle it on the slug's body with citrus peel: citrus fruits contain limonene and linalool, which can kill aphids, fungus mosquitoes, mealybugs, slugs and other soft pests.

Brew a citrus peel with 2 cups of boiling water, leave it for 24 hours, add a few drops of medicated soap soap, and then spray.

6% tetraacetaldehyde particles can be sprinkled in the ground to poison them. It can also be sprayed directly on the foliage with tetraacetaldehyde powder. 30 grams of 70% spiramine powder per mu are sprayed directly on the plants, which can effectively kill slugs.

Clearing the garden and ploughing the land will destroy the living environment of the slugs. Because the slugs are dormant and nocturnal, we use the way of clearing the garden to eradicate the weeds on the ground in the toon greenhouse, and at the same time take the way of cultivating and loosening the soil to reduce the humidity of the soil in the shed, and destroy the living environment of the slugs. We remember that a few years ago, we found that slugs appeared on the leaves of winter wheat, slugs are not toxic to the human body, but they harm crops.

Omnivorous nature of slugs,Naturally, I won't let go of toons, so the more the merrier. Especially in spring, the toons in this greenhouse have very tender and juicy shoots for slugs, which must be "delicious". Slug generally likes to live in a dark and damp, loose and humic environment, which is nocturnal and nocturnal, most afraid of direct sunlight, and sensitive to environmental reactions.

When the temperature is lower than 15, higher than 33 dormant, lower than 5 or higher than 40, can kill slugs like to be active at night, crawling on the leaves and buds of the toon, although the action is slow, but the appetite is not small, a night can sweep a large piece, the new toon buds are fresh and delicious, the slug can bite and eat, causing the leaves to be missing, broken seedlings.

In spring and autumn, it occurs after dew or rain, and it is highly affected by high temperature and drought in summer or dormant in hidden places in winter. Slug hides under the wet soil or in the shade during the day, and feeds at night, and can be harmful day and night on rainy days.

The vegetable borer is suitable for high temperature and low humidity environmental conditions, the suitable temperature conditions are 30-31, the relative humidity of the air is 50%-60%, when the temperature drops to 20 and the humidity exceeds 75%, a large number of larvae die. Females prefer to lay eggs on the heart lobes of seedlings at the 3-5 leaf stage, and less on smaller or larger seedlings. Therefore, whether the 3-5 leaf stage of autumn vegetable seedlings meets the peak spawning period is one of the reasons for the severity of the damage.

Cruciferous vegetables are also cropped in a way that favors the occurrence of pests.

Temperature conditions, as long as the temperature reaches a certain height, the slugs will come out and be with the cabbage.

In the south, you can grow cabbage in autumn, you should choose some base fertilizer, it is best to choose some sandy soil, because the water absorption and air permeability of sandy soil are very good, and it will also make cabbage grow more vigorous, so you should water less.

First of all, it is necessary to choose a better soil, and the drainage of this place must be good, and at the same time there must be a water source nearby, choose a particularly good variety, and then choose the right planting time and environment, must choose the right planting density, and also need to apply base fertilizer.

Planting cabbage requires attention to the following processes: choosing the right soil, sowing seeds, ploughing, fertilizing, insect repellent, etc.

1. Slow growth due to temperature.

Many people find that the growth of Chinese cabbage at this stage is slower than in other periods. The growth of Chinese cabbage in all aspects is no different from that of previous planting, but the growth of Chinese cabbage is not good. In fact, it can be caused by temperature.

We all know that the temperature in early spring is not very stable, but the growth of Chinese cabbage requires a relatively stable temperature. It grows fast when the temperature is high and grows slowly when the temperature is low. For example, when the spring season is high or low, the growth of Chinese cabbage will change.

It's going to get faster and slower, and it takes time to get used to. This leads to a gap between the growth of Chinese cabbage and other periods.

2. The survival rate after seedling emergence is low.

The problem of low survival rate after emergence is also common. Most seeds germinate after sowing, but begin to die in batches after emergence. This situation is usually caused by the environment.

As mentioned above, the temperature is unstable in early spring, and the cabbage seedlings themselves are relatively bright and fragile. The external environment changes frequently, and the seedlings will not be able to tolerate this change and eventually die. Due to the barrier of the soil, the seeds are able to germinate, giving the seeds a relatively safe space.

The emergence of cabbage is in direct contact with the outside world, which is one of the reasons for the high mortality rate after the emergence of cabbage.

3. Too much water.

During this season, there is comparatively more rainfall. In addition, there is a lot of farmland that needs to be prepared for spring planting. Everywhere began to store water for farming.

I'm sure we all know the dangers of too much water. In addition, many people have not had time to improve their drainage channels shortly after the beginning of spring, which makes the water accumulation even worse. Therefore, it is necessary to prepare for waterproofing before planting Chinese cabbage and prepare for drainage after planting, otherwise these Chinese cabbage may be planted in vain.

4. The rot is very serious.

Cabbage rot is also a common problem this season. One is water rot, the former is caused by excessive precipitation, and the other is soft rot, which is a latent disease caused by the slow recovery and erosion of cabbage at this time. At this time, insects are not very common, so it is best to focus on preventing both.

In the case of the rapid onset of water soft rot, we should pay more attention to whether there is such a situation in the vegetable field.

Winter vegetables are sown in early November and the harvest period is as long as 4-5 months, cabbage varieties, disease, can be sprayed with Manhattan iodine preparation fungicide generally to carry out seedling transplanting. In South China, the seeds are generally sown from September to December, and are sown in batches** until February of the following year. Generally, it can be harvested 20-40 days after planting.

Cabbage is cultivated in spring, mainly to harvest young plants for consumption, sowing from February to April, and harvesting from April to May. In summer, cabbage seedlings are mainly cultivated, and sowing begins in early May and lasts until August. 25-30 days after sowing, young plants are harvested and marketed.

Cabbage prefers a cool climate, with an average temperature of 18-20 and sunny conditions to grow best. -2 -3 can safely overwinter. Above 25, the heat is weak and susceptible to viral diseases, and only a few heat-tolerant varieties can be cultivated in the summer.

When the germinating seeds and greens of cabbage are below 15 and the temperature is below 15, vernalization is completed after a certain number of days, and the flower bud differentiation begins at the seedling end, while the leaf differentiation stops. Sprouts and blooms under conditions of long days and high temperatures. However, there are obvious differences in the requirements of different varieties for long sunshine.

Cabbage, also known as cabbage, is an adaptable and stress-resistant vegetable that is easy to cultivate. In order to cultivate robust and qualified seedlings, the following points need to be paid attention to in the management of cabbage seedlings.

Key points for the management of cabbage seedlings:

1.Fertilization, furrowing: seedling furrow can be used yang furrow, each standard yang furrow (mu) into the rotten high-quality circle fertilizer 200 kg, and then apply the rotten manure or chicken manure 70 80 kg, superphosphate 2 3 kg, plant ash 10 kg, fertilization after deep turning, rake flat, leave the sieved fine soil ready to do soil covering, the yang furrow covered with plastic film, baking 15 20 days after the temperature rises and then sowing.

2.Appropriate sowing: spring cabbage has strict requirements for sowing date, and the suitable sowing date should be determined according to the strength of cabbage winter, local climatic conditions, and seedling raising methods (Yangqi seedlings, improved Yangqi seedlings, hotbed seedlings, greenhouse seedlings).

For example, late-maturing varieties have a long seedling age and are mostly sown in late autumn and early winter, while early-maturing varieties have a short seedling age and are mostly sown in early January. Greenhouse and hotbed seedlings can be sown from mid to late December to January. Cabbage seeds are easy to germinate, generally do not need to be soaked, germination and other seed treatment, such as the purchased seeds germination rate is low, can also be soaked in warm water after germination. Before sowing, the seedlings are watered thoroughly, and the seeds are evenly sown after water infiltration, and the fine soil is covered with 1 cm thick after sowing.

After sowing, cover the plastic film tightly, pay attention to the insulation of the seedbed to facilitate the emergence of seedlings, and keep 20 25 during the day.

3.Seedling management: The management of seedlings sown before winter should be "controlled first and then promoted".

First control: after the seedlings emerge before wintering, the temperature and water are controlled, the temperature is 10 15 during the day and 5 8 at night, so as to avoid the overwintering of large seedlings and cause early sprouting. Pay attention to cold protection and heat preservation during wintering.

Post-promotion: After the seedlings are divided in the spring of the second year, fertilizer and water are increased, the temperature is increased, and the growth of seedlings is promoted.

Carry out seedling sorting at the 3-leaf stage of seedlings, choose warm weather for processing, and it is best to have several sunny days in a row after seedling division. When the seedlings are divided, the seedlings are dug up with a shovel, and the shallow ditch is opened according to the row spacing of 10 cm in the seedling furrow, after watering in the ditch, the seedlings are pasted on the edge of the ditch according to the plant spacing of 8 10 cm when the water seeps to half, so that the seedling root system is stretched, and then the soil is covered, and the depth is the same as the original depth of the seedlings into the soil. After seedling, the seedbed was controlled for 20 days and 10 nights to promote root growth.

After the seedlings are slowed down, the temperature is slightly lowered, 15 20 during the day and 8 10 at night, so as to prevent the temperature from being too low and causing the seedlings to pass vernalization.

The light at the seedling stage should be sufficient to promote the healthy growth of seedlings. Combined with temperature management, proper ventilation and humidity removal, and more attention should be paid to reducing humidity on cloudy and snowy days to avoid morbidity.

4.Seedling refining: 7 to 10 days before planting, the seedlings are watered and cut into pieces, and the seedlings are refined, and the temperature is reduced as much as possible without frost damage, so as to adapt to the low temperature environment of the open field in spring.

5.Strong seedling standard: The morphological characteristics of cabbage age-appropriate strong seedlings are: there are 6 8 true leaves, the hypocotyl and internodes are short, the leaves are thick and dark, the stems are thick, and the roots are up.

When choosing cabbage seeds, you should choose cabbage seeds with strong viability, and you should also choose cabbage seeds with very good reproductive ability, and also choose cabbage seeds that grow very lushly, so that the growth of cabbage will be very good.

Be sure to choose some high-quality seeds, be sure to choose some with a high survival rate, and at the same time have a good high temperature and cold resistance, and then choose some with high cost performance and high product quality.

When choosing seeds, you must choose full grains, and you must choose seeds with strong resistance, so that it will be particularly high-quality and there will be no pests and diseases when planted.