What pesticides can make plants drop flowers and fruits, and when is the best time to apply them?

Insecticides such as naphthylacetic acid, ethephon, dinitro compounds, sulfur-mixing agent, carbaryl, etc. can usually cause flowers and fruits to fall, and the fruit will fall about 7- 10 after spraying ethephon solution. There are many reasons for plants to drop flowers and fruits, such as diseases and insect pests, insufficient nutrition, poor pollination and fertilization, and lack of water in the body after encountering high temperature weather.

1. What pesticides can make plants drop flowers and fruits?

1, pesticide type

After using dinitro compounds, sulfur compounds, naphthylacetic acid, ethephon, carbaryl and other pesticides, plants will drop flowers and fruits. Ethephon is usually used to make plants drop flowers and fruits. Usually, flowers and fruits will fall off after spraying ethephon solution for about 7- 10 days.

2. Causes of falling flowers and fruits

(1) pests and diseases: serious pests and diseases are likely to occur if they are not treated in time after the occurrence.

(2) High temperature weather: After encountering high temperature, the water in plants will evaporate rapidly. If water is not replenished in time to ensure the normal growth of plants, it is easy to drop fruit.

(3) Insufficient nutrition: Plants need sufficient nutrients during their growth. If the nutrition is insufficient, it will lead to stunted growth, which is prone to falling flowers and fruits.

(4) Poor pollination and fertilization: If you encounter high temperature, low temperature and some disastrous weather after flowering, it will lead to poor pollination and fertilization of plants, and then it is easy to drop flowers and fruits.

Second, when is it better to use pesticides?

1, spraying time

(1) Generally, it is appropriate to inject drugs in two time periods, one is around 10 in the morning and the other is around 4 pm.

(2) If the spraying time is too early in the morning, there will be dew on the leaves, which will dilute the pesticide, thus affecting the spraying effect. Similarly, if the spraying time is too early in the afternoon, the liquid medicine will volatilize in the high temperature environment, which will not only easily affect the spraying effect, but also easily lead to seedling burning.

2, the correct spraying method

(1) should be applied in strict accordance with the dosage in the instructions, and protective clothing should be worn to ensure the safety of application.

(2) You should not eat, drink or smoke during the application period.

(3) It is not advisable to use drugs in the high temperature period and windy days at noon, and the drugs should be used evenly to ensure the best curative effect.