A method for controlling undesired plant growth and for regulating plant growth by allowing 4-methyl-5H-indeno[3,2-b]pyridines and 1-methyl-9H-indeno[2,3-c]pyridines of the general formula I ##STR1## where X, Y, Z and the radicals R.sup.1 to R.sup.5 have the meanings as described in the specification, to act on the plants, and novel 4-methyl-5H-indeno- [3,2-b]pyridines and herbicides and plant growth regulators containing these.
一种控制不良植物生长和调节植物生长的方法,通过让通式I中的4-甲基-5H-
吲哚[3,2-b]
吡啶和1-甲基-9H-
吲哚[2,3-c]
吡啶作用于植物来实现,其中X、Y、Z和基团R1至R5的含义如说明书所述,并且包含这些的新型4-甲基-5H-
吲哚[3,2-b]
吡啶、
除草剂和
植物生长调节剂。