Substituted benzisoxazole and benzisothiazole herbicidal agents

derivs. of formula (I) are new: R = H, halogen, 1-4C alkyl, 1-4C haloalkyl, 1-4C alkoxy or 1-4C haloalkoxy; R1 = halogen, X1R2 or R2; X = S; X1 = O or S; R2 = H; 1-4C alky, 3-7C cycloalkyl, 2-6C alkenyl, 4-7C cycloalkenyl or 2-6C alkynyl, all opt. substd. by 1-3 of halogen, 1-4C alkoxy or 1-4C alkylthio or by 1 of CN, COR3, COOR4, CONR5R6 or phenyl, where phenyl is opt. substd. by 1-3 of halogen, 1-4C alkyl or 1-4C alkoxy or by 1 of 3-6C cycloalkyl, 1-4C haloalkyl, 1-4C alkylthio, CN, nitro, COR7, COOR8 or OR9; or phenyl opt. substd. as above; R3, R5, R6 and R7 = H, 1-4C alkyl, 2-4C alkenyl, 2-4C alkynyl, benzyl or phenyl; R9 = 1-4C alkyl, monosubstd. by COOR10; R4, R8 and R10 = H, 1-4C alkyl, 2-4C alkenyl, 2-4C alkynyl, benzyl, phenyl, alkali(ne earth) metal, Mn, Cu, Zn, Co, Ag or Ni; Q = a gp. of formula Q1-Q22: R11 and R12 = H, 1-6C alkyl, 1-6C haloalkyl, 3-6C cycloalkyl or 3-6C halocycloalkyl, or R11+R12 forms a 4- to 7-membered ring opt. interrupted by O, S or N and opt. substd. by 1-3 Me gps. or 1 or more halogen atoms; R13-R15 = H or 1-3C alkyl; A and A1 = O or S; V = OH, halogen, 1-3C alkoxy or 1-3C alkylthio; W = halogen or 1-3C alkyl; Z = N or CH. Also claimed are: (1) a method for controlling undesirable plant spp., comprising applying a cpd. (I) to foliage or to soil or water contg. seeds or other propagules; (2) a method for controlling undesirable plant spp. in transplanted rice, comprising applying a cpd. (I) to soil or water contg. seeds or other propagules of the plants after the rice has been transplanted; and (3) a herbicidal compsn. comprising a cpd. (I) and a carrier.