A Hiboy is a specialized, high-clearance type of farm tractor designed to operate in high crops without damaging them. The largest producer of hiboys is Hagie Manufacturing Company of Clarion, Iowa, United States. The most common uses of hiboys are for detasseling, spraying herbicides, and applying glyphosate directly to weeds growing above crop height with a wick or wiper.
References
Hiboy Wikipedia(Text) CC BY-SA