In general, the time of spraying the fungicide too late or too early will affect the control effect. The premature spraying of pesticides not only causes waste, but also reduces the control effect.
However, when the spraying time is too late, a large number of pathogens have invaded the host or cause harm, and even if the systemic drug is sprayed, the results will not be as effective.
Therefore, the use of fungicides should be based on the occurrence of crop diseases, and the forecast and the occurrence of specific conditions in a timely manner medication. Usually, the time for the use of the bactericide should be prior to the onset (protective use) or early onset (prevention).
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