2 - haloalkyl - 3 - oxo - 4 - substituted quinazolines represented by the formula ## str1 ## wherein r is hydrogen , lower alkyl , lower alkyl substituted with one to three of the same or different halogens , phenyl or phenyl substituted with 1 to 3 of the same or different substituents selected from a group consisting of lower alkyl , lower alkoxy , lower alkylthio , fluoro , chloro , bromo , iodo , nitro , cyano , or lower alkyl substituted with one to three of the same or different halogens , r 1 is hydrogen , lower alkyl , or lower alkyl substituted with one to three of the same or different halogens , y 1 , y 2 , y 3 and y 4 are independently selected from a group consisting of hydrogen , lower alkyl , lower alkoxy , lower alkylthio , fluoro , chloro , bromo , iodo , nitro , cyano , or lower alkyl substituted with one to three of the same or different halogens and x is fluoro , chloro , bromo , iodo , cyano , lower alkoxy , thiocyano and ## str2 ## where r 3 and r 2 are the same or different lower alkyl possess fungicidal and algicidal activity .