Teaching plan of social practice course "How to guide flower farmers to spray pesticides"

(1) Prevent flowers from being hurt. To avoid the phytotoxicity of flowers, the first thing is to pay attention to the concentration of pesticide application. Excessive application concentration is a common disease that harms flowers, so it is necessary to strictly control the application concentration and not to be too high.

Secondly, it should be noted that different kinds of flowers, or flowers of the same variety at different development stages, have different reactions to pesticides. For example, Bordeaux mixture and its copper-containing bactericide are easy to cause phytotoxicity to asparagus, peaches, plums and pears. Sulfur mixture is easy to cause phytotoxicity to peaches, plums, plums, pears, grapes and apricots. When chlorothalonil is used in high concentration, it is also easy to cause phytotoxicity to peaches and plums. Dimethoate is easy to cause phytotoxicity to plum blossom, elm leaf plum, peach, peach, apricot, cherry blossom and begonia. Dichlorvos are also easy to cause phytotoxicity to rhododendrons, plum blossoms and cherry blossoms. Cartap sometimes causes phytotoxicity to violets and pomegranates. Generally speaking, the same kind of flowers are prone to phytotoxicity at seedling stage, bud stage and leaf stage, and most flowers are sensitive to pesticides at flowering stage, so they should be used with caution.

Thirdly, the application temperature is high at noon and the sunshine is strong, which is easy to cause phytotoxicity, so the application should be carried out in the evening in summer. The fourth potion should be used together. If it is stored for a long time after preparation, it is easy to precipitate or decompose the effective components, which not only has low control effect, but also is easy to produce phytotoxicity.

(2) to prevent human poisoning. Most pesticides are toxic chemicals. Although there are high toxicity, poisoning and low toxicity, most of them are toxic to human body. Therefore, we must pay attention to safety when using it to avoid poisoning. Before applying pesticides, it is necessary to know the toxicity of various pesticides and the matters needing attention in use. It is best to wear rubber gloves when applying to prevent drugs from getting on the skin. When spraying, it is best to choose outdoor windless weather. If there is an emblem wind, spray it downward to prevent the liquid medicine from splashing on the face and toxic gas from entering the human body. Wash your hands with soap immediately after application, just in case.