According to the description, this is a lesion caused by thrips. It should be sprayed with pesticides, such as ethyl spinosyn plus nitenpyram spray; thiamethoxam plus lambda-cyhalothrin spray. Disclaimer: Some articles on this website are transferred from the Internet. If third party legal rights are involved, please inform this website to deal with them. phone Multi Point Locks,Stainless Steel Multi Point Locks,Multi Point Door Locks,Multi Point Security Lock Ningbo Hengchieh Locking Technology Co., Ltd. , https://www.yh-lock.com