水稻抽穗前后常会遭受多种病菌的为害,需要进行化学防治,这是保证水稻获取丰收的重要措施。但是,穗期前后使用杀菌剂必须谨慎,否则就会出现药害,导致减产。抽穗扬花期使用砷制剂,有造成水稻不结实的风险。在生产上已发现,40%福美胂可湿性粉剂在抽穗扬花期喷施,用于防治水稻的稻瘟病、稻曲病,结果 3~4天后出现药害症状,稻穗上开始出现大量颖壳发白的空粒,并有零星白穗出现,其余穗子上或多或少出现白 Before and after rice heading often suffer from a variety of pathogenic bacteria, the need for chemical control, which is an important measure to ensure rice harvest. However, the use of fungicides before and after the spike must be cautious, otherwise there will be phytotoxicity, resulting in reduced production. The use of arsenic at the heading and flowering stage poses the risk of not growing out of rice. In production, 40% of arsine WP was sprayed at the flowering and flowering stage to control rice blast and rice false smut. After 3 to 4 days, phytotoxicity symptoms appeared. A large amount of glume White empty grain, and sporadic white spike appears, more or less white on the remaining ears