In the process of using pesticides, it often occurs the problems of abusing or doing preparation is not scientific, which results in it can not reach the ideal results. So, when we using pesticides, we must pay attention to the following problems.

First, being careful not to misuse pesticides. Do not abuse banned pesticides on certain crops, such as fruits and vegetables, they can not  be used with methamidophos, 1605 and other highly toxic pesticides. People can not misuse pesticides during the disable period of crop, for example, people can not spray fenitrothion in 14 days before the rice harvest. Such as 1605 can not be mixed with rice blast net (toxicity surge after mixed). calcium arsenate can not be mixed with retreat bacterial pesticide. Dimethoate can not be mixed with lime sulfur or Bordeaux mixture. WP can not be mixed with cream and so on.

Second, pay attention to choose the right dose. For the preparation of pesticides, farmers are accustomed to dilute according to their feelings, this is not scientific. If the pesticide preparation is too thick, it could easily lead to crop injury. Pest has the resistance, and it is easy to cause environmental pollution and livestock poisoning and other adverse consequences. For example, if the preparation is too thin, it will not reach  the controling effect. Therefore, the use of pesticides should be strictly in accordance with the instructions or guidance of technicians from the preparation of pesticides, and just the right amount should be grasped during application. Spraying is required to achieve uniform, thoughtful, moderate (fully wet the foliage and not lost is appropriate). If a kind of pesticide on the same crop in continuous is used too many times, it is easy to produce drug resistance or pest resistance, the controlling effect gradually reduced or even invalid. Therefore, we should pay attention to the use of pesticides' cross rotation.

In short, when controlling crop pests and diseases, we should conscientiously carrying out the guidelines of comprehensive prevention, and we should actively use a variety of effective non-chemical control measures.