Hello. The symptoms are specific to the phytotoxicity that occurs when the herbicide vapors reach plants other than those targeted. This phenomenon is called “vapor drift” and occurs when herbicides are applied during windy or hot days. These symptoms can also occur if crop protection treatments have been carried out with a pump that has not been properly cleaned (which has also been used for herbicide application).
In this situation, it is recommended to remove the affected parts (they will not recover) and to apply a foliar fertilizer, which stimulates the foliage recovery and helps the plants overcome this stress period: . It is applied by foliar spraying at a dose of 25 ml/10 L water. 2-3 treatments can be carried out at 10-14 day intervals. It is important to apply the fertilizer early in the morning, when temperatures are not very high.
For detailed information on the good practices for the application of phytosanitary treatments, you can consult the following article: Phytosanitary treatments - environmental and labor protection.