First of all, it is necessary to understand which part of the crop is infested by the germ, the period of initial infection and the main stage of the damage, etc., in order to apply it in a targeted manner. For example, wheat stripe rust is mainly harmful to the leaves, sheaths and panicles of wheat, and most of them are infested between the jointing stage and the booting stage of wheat. Therefore, it is necessary to protect the heading to the filling stage. If the protective agent is sprayed, it should be carried out between the late jointing and the heading.
Second, we must maintain continuous protection. The retention period of the protective agent is generally 5 to 7 days. Therefore, it is necessary to spray the drug once every 5 to 7 days during the disease infestation, which is particularly important in the prevention and treatment of certain fruit tree diseases. In the past, there were often poorly applied protective agents, many of which were problems with the application of the drug. The first application was late, the disease had invaded; the interval between the two sprays was long, and the protection time was twice. Not connected, etc.
In addition, after the application of the protective agent, the effect of the drug can not be seen immediately. After a certain period of time, the effect can be seen by comparing with the same field without applying the same field.
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