Dithiindicarboximide, dithiolanedicarboximide, thiapyrandicarboximide and pyrandicarboximide derivatives as plant growth regulants

The invention is a novel class of dithiindicarboximido, dithiolanedicarboximido, thiapyrandicarboximido and pyrandicarboximido derivatives represented by the formula: wherein X is CH2 or S; Z is S, O or SO, provided that when Z is O, X cannot be S; Y is -COOR3, -CONR4R5, -CONHNR6R7, -CONHN(+)R6R7R7.halide(-), CN, -CONHOH or -COR10; n is 0 or 1; R1 and R2 each represent alkyl C1-C4, or when taken together with the carbon to which they are attached form cycloalkyl C4-C8 or methyl-substituted cycloalkyl C4-C9; R3 is hydrogen or alkyl C1-C4; R4 and R5 each represent hydrogen, alkyl C1-C4, phenyl, monohalophenyl, monoalkyl(C1-C4)phenyl or monoalkoxy(C1-C4)phenyl; R6 and R7 are alkyl C1-C2; R8 is hydrogen, alkyl C1-C4, phenyl, monohalophenyl, monoalkyl(C1-C4)phenyl, monoalkoxy(C1- C4)phenyl, mononitrophenyl or trifluoromethylphenyl; R9 is hydrogen or alkyl C1-C4; R10 is halogen; represents a single or double bond.