At present, we have come to the season when greenhouse vegetables are listed and profitable. However, these cultivated crops have avoided many pests and grassland damage on the open land. At the same time, they have added a lot of diseases, causing serious problems for growers. Here, some common symptoms and diseases in greenhouses are described in terms of both physiological and pathological aspects.
Physiological reasons
The long-term flooding in the shed caused the soluble soil in the deep soil to spread to the surface along with the water, and the use of a large amount of chemical fertilizers further exacerbated the occurrence of salinization, which often resulted in the planting of young seedlings. This dead seedling is often not directly caused by germs, but more dead roots.
After becoming a plant, it is most easily discerned. For example, the stem on the ground above the ground starts to grow and grow, and Zizi roots, often due to excessive saline-alkali soil, and is not suitable for root growth and respiration. Open up the soil and reveal the root system. I believe most people who have entered the greenhouse know that the fist-sized root supports one plant.
Suggestion: Small water pouring, less pouring, water flow to the ground is appropriate, if it has become a plant, reduce the use of fertilization, increase the amount of foliar fertilizer, can greatly change the status of crop growth.
There is also the problem of soil. This is not just a problem of salinization, but more is the destruction of the soil caused by improper agricultural operations. The most serious one is the shed. What kind of shelter? Cotton, chloropicrin, methyl bromide, etc., all indiscriminately, fungi, bacteria, insects, seeds will kill the species, and then fill the shed and then artificially add bacteria and other agents.
Pathological causes
In the winter greenhouses, this issue is often heard by farmers. They have to fight drugs every few days. There is no string of squats. They fight again and again and again, until they are all resistant, or they are not cured. . This can not blame the poor operation of farmers, and indeed many of the theoretical situation is that they do not consider it, which is also the cause of repeated diseases caused by the disease, these diseases are basically fungal diseases, other diseases are less.
In fact, the reason is very simple. The fight drugs have been played very carefully and sprayed very thoroughly. However, there are some places that have been overlooked. These places are covered by plastic film, namely the shed wall and roof. There are many water droplets in these areas almost all the time. Many spores of pathogens are hidden inside. When water accumulates more, they drop as the waterdrops become part of the secondary infection.
Recommendation: Not particularly agree with the use of smoke, a relatively large risk, and second, caused by the temperature inside the greenhouse, oxygen decreased, poor plant growth.
Before spraying, use the kind of tool that is used in homes with poles and glass windows, wipe the entire wall of the plastic film with a solution of rubbing liquid, wipe it twice, leave no dead ends, and then spray, which can basically guarantee the crop. It is no longer infested by the same disease, provided that no new fungal spores or the like are acquired from the outside.
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