Abstract: An applicator on a flexible support for herbicides and the like is formed with a rotating disk carrying a plurality of generally radially extending wicks. The wicks are fed by liquid from a central container and a rotatable cover is provided about the applicators.

Abstract: An extendible boom utilizing a rack and pinion mechanism to enable reciprocating movement of a work head such as a spray for agricultural application beneath orchard trees, the boom comprising a hollow section having a substantially rectangular cross-section containing a slot along the lower wall, running on internally disposed supporting rollers, having a rack extended therealong, mated with a driven pinion wheel to enable boom movement.