Due to the variety of greenhouse vegetables, the cultivation methods are various, the farming system is complex, the temperature is high, the humidity is high, the disease is prone to occur, and there are many kinds of diseases and pests, and the damage is heavy.
Some vegetable farmers have suffered from diseases of various vegetables, whether they are fungal diseases, bacterial diseases, viral diseases or physiological diseases. They have seen that the leaves and fruit of vegetables have undergone slight changes and are sprayed with pesticides; for various vegetable pests, no matter whether they are caused by insecticides or not. Caused by the worm or caused, and regardless of the use of drugs can not cure their worms, as long as the insects hit the drug to kill. This practice is wrong.
In fact, each pest has its own unique habits and hazards. For example, powdery mildew is easy to infect the young part of the vegetables, and black spot disease is easy to infiltrate from the lower leaves. The worms gather on the back of the leaves to absorb vegetable juices. Most of the pesticides used to prevent and treat diseases and pests are particularly strong in their specificity. They are often directed against the diseases or insect pests caused by one or a certain type of pathogens and are ineffective against other diseases or insect pests. Therefore, it must be due to illness and insecticide.
Individual farmers have seen pests in the sheds and want to eliminate them completely. It is completely unnecessary. From an economic point of view, pests in sheds should not be controlled as long as they do not exceed prevention and control targets. Otherwise, the output-to-investment ratio may be reduced, which is not worth the candle.
Guangdong Jia Mei Biological Technology Co.Ltd , https://www.jaymeimask.com