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Answer: Continuously raining during the summer and summer harvest seasons has a great influence on the effect of pre-emergence weed control by spraying closed medicines, which can be divided into two situations. One is the continuous rain after spraying the closed medicine, and it is easy to produce phytotoxicity. If the rain is not large, it will not only produce no phytotoxicity, but it will help increase the public opinion and facilitate the use of closed efficacy. If you are worried about excessive rain, you can see the seedlings and remedy them. In another case, it was just after sowing, and it had continued to rain until it had time to seal the herbicide. Can wait for the rain to stop, if the seedlings have not been out, in time to fight closed herb weeding, if the emergence of spraying has been prohibited, can only wait until the 3 to 5 leaf stage post-maize corn seedling herbicide.