An apparatus and methods are provided for removing unwanted plants or weeds from an area such as an agricultural plot or lawn. The apparatus includes a three-dimensional imager configured to capture plant images and locate plants; an image processor configured to distinguish between wanted and unwanted plants based upon the captured plant images; at least one removal device configured to damage a target on the unwanted plants; a guidance system configured to direct at least one laser beam toward the unwanted plant; a stabilization system configured to provide feedback compensation to one or both of the three-dimensional imager and the guidance system; and a chassis configured to support the three-dimensional imager, the laser device, the guidance system, and the stabilization system. The chassis is configured to be moved across the area.

A stalked crop harvesting header comprising multiple harvesting units each comprising a pair of deck plates defining a channel, a pair of snapping rollers mounted below the deck plates and adapted to pull stalks downwardly through the channel, a pair of gathering chains provided with cams, the gathering chains extending between a first pair of gears located at the front end of the harvesting unit and a second pair of gears located at a back end of the harvesting unit, wherein each harvesting unit further comprises a pair of stalk guiders positioned to rotate around axes coinciding with respective axes of the first pair of gears, wherein the stalk guiders each comprising an upper stalk guiding wheel and a lower stalk guiding wheel which are interconnected, and wherein a cutting element is provided below the lower stalk guiding wheel to cut stalks while being guided by the stalk guiders.

A modular agricultural header may include a first portion including a mount configured to selectively couple to an agricultural harvester; a second portion defining a first lateral end of the agricultural header; a third portion defining a second lateral end of the agricultural header, opposite the first lateral end; and a first modular row unit disposed between one of the first portion and the second portion or the first portion and the third portion. A separation distance between one of the first portion and the second portion or the first portion and the third portion may be altered in response to coupling or decoupling of the modular row unit therebetween.