Buy seeds and seedlings from production units with strong technology and excellent reputation, and ensure that they are free from pests and diseases.
If possible, plant disease-resistant varieties as much as possible.
Compared with other crops, flowers are backward in cultivating new varieties of resistance, but in any case, when there are chronic diseases such as botrytis cinerea in greenhouse, it is particularly important to choose resistant varieties.
3. Isolated cultivation with new planting materials introduced from outside.
When planting seeds from different places and production units, it is very important to cultivate them separately from their original crops. In the process of isolation. Isolation has been carried out to make sure that the new seedlings are free of pests and diseases so far.
4. Maintain good environmental sanitation.
The cleaner the greenhouse is, the less chance the pests and diseases will spread. This means that there are no weeds in the greenhouse aisle and around the greenhouse. Plastic pipes and nozzles should not be placed on the ground or in the pool at will. Pick up dead leaves, branches and abandoned flowers from plants in time, and put the garbage in the dustbin instead of littering everywhere. In batch production in a flower crop area, other types of flowers should not be put in the middle, which will affect the unified management. Before disinfecting the potted plants and production areas specially planted on flowerpots, it is necessary to reduce the chance of spread of germs.
5. Monitor the population density and minimize the pressure if possible.
In order to harvest cut flowers or flowerpots without sanitary pests, growers must minimize the population density of pests as much as possible. Pests not only harm plants by feeding, but also spread various plant viruses. The economy of flower thrips will cause considerable losses to insects, and thrips can be used to monitor the yellow and blue panels of armyworm. The species and population density of greenhouse pests can be known by monitoring the population density.
6. Reduce the incidence by controlling the greenhouse conditions.
The higher the humidity in the greenhouse, the greater the risk of illness. This is because most fungal diseases are easy to breed and spread under high humidity, and the relative humidity of greenhouse ceiling is 85%. When the relative humidity is more than 85%, the disease is still difficult to control even if fungicides are used. High humidity can be reduced by heating and ventilation. Avoid water droplets attached to plant leaves for a long time. Use sprinkler irrigation or sprinkling water, preferably in the morning, before the water drops on the plants start to dry in the evening. Avoid watering too much, otherwise it will promote the occurrence of root rot, and use a well-drained culture medium. Unless you know that there are unnatural pathogens in the soil, you will not mix them with soil matrix in soilless culture, because most soils contain bacteria produced by root rot of plants. Seedbed cultivation is adopted to ensure that there is no barrier and no water accumulation underground.
7. Avoid being stimulated or stressed by various unfavorable conditions of plants.
The greater the stress on plants, the greater the possibility of bacterial infection. Avoiding stress on plants means that plants have sufficient water supply, the salt content in soil is in balance, light and temperature are the requirements of plant growth, and the nutritional balance is enough to make plants in the best development state. If there is too much salt in the soil, the roots of plants are vulnerable. Injured people are more vulnerable to root rot and bacteria. There will be many similar problems.
8, often check the growth of crops.
This plant can grasp the situation of each growth and development stage. Sometimes it is simple to check again in the greenhouse inspection. When something happens to a pest, you can know it as soon as possible without being surprised. Visit every corner of every greenhouse and pay attention to the back of leaves, because the back of leaves is often a hiding place for pests.
9, without permission, free of charge.
For this principle, even the best growers may do well, and inexperienced employees wandering around in the greenhouse may also become the way of disease transmission. There is no need to touch plants, whether they are conscious or unconscious, which may also lead to the spread of fungi, viruses and germs.
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