1 , 2 - benzoisothiazol - 3 - one , 1 , 1 - dioxide , ion , 2 - hydroxy - n , n , n - trimethyl - ethanaminium represented by the following formula : ## str1 ## is found to have great utility as an effective component in plant protection agents for control of fungi and bacteria . by the use of the compound , diseases or blights of plants can be effectively prevented .