How many critical periods are there in the application of pesticides to fruit trees? What are the precautions?

The price of fruit has risen in recent years, which has made many fruit growers happy. However, although the economic benefits of fruit cultivation are good, it is not so simple to manage. In order to reduce the invasion of diseases and insect pests, certain pesticides are often sprayed. How many critical periods are there in the application of pesticides to fruit trees? What are the precautions?

How many critical periods are there for the application of pesticides to fruit trees?

The main results are as follows: 1. The tender bud expansion period of fruit seedlings. Also known as polysaccharides, this stage should be sprayed with insecticides with high concentrations, whether on or under trees, mainly to prevent overwintering pests and germs of fruit trees.

2. Flower bud stage. During this period, pesticides and fungicides need to be sprayed, mainly to prevent flower rot.

3. One week after falling flowers. The main purpose of spraying pesticides during this period is to prevent aphids, pear planthoppers, red spiders and so on.

4. Early stage of defoliation after fruit picking. The main purpose of this period is to reduce the occurrence of overwintering pests, so that there will be fewer pests in the second year. Note that acidic and alkaline agents should not be used together when mixed spraying.

Second, what are the matters needing attention when applying pesticides to fruit trees?

1. Blind use of drugs regardless of tree species

Growers should distinguish between different varieties of fruit trees when using pesticides, such as peach trees, the more sensitive agents are phosphoramines, stone fruit trees are very sensitive to trichlorfon, and pear trees are very sensitive to Bordeaux and Fuxing. If the medicament is used indiscriminately regardless of variety, it will cause serious harm to the fruit trees.

2. The concept of mixed pesticides is not clear.

Generally speaking, some pesticides can be mixed and sprayed together, but some are not suitable and do some harm to fruit trees. For example, when stone-sulfur mixture is confused with Bordeaux liquid, it will increase water-soluble copper, and it will be prone to drug damage when sprayed on fruit trees.

Generally spraying stone sulfur mixture for ten days before spraying Bordeaux liquid, if it is spraying Bordeaux liquid, it usually takes a month for female to spray stone sulfur mixture. In addition, Bordeaux liquid can not be mixed with thiram, bacilli and other agents. If mixed with inorganic phosphorus pesticides, it can be matched at will, without too many requirements.

3. There is no spraying according to the weather.

When we spray pesticides on fruit trees, we should spray them according to the weather changes, so as to pay attention to the weather forecast in time. If it rains that day, don't spray pesticides.

4. don't spray when the temperature is low or dry.

We should know that the best temperature for pesticide use is between 20 and 30 degrees Celsius, so that the efficacy is better. If in the case of drought, low temperature or high temperature, the efficacy may not be achieved, and fruit trees will still suffer from diseases and insect pests.

To sum up, the use of pesticides in the cultivation of fruit trees is also a subject of knowledge. We should use them in accordance with the instructions of pesticides, and do not match them blindly, which may lead to reduced production of fruit trees, environmental pollution and other phenomena.