Which of the following herbicides is effective in controlling woody plants?

All three herbicides mentioned—Hyper, Velpar, and Spike—are effective in controlling woody plants, which is why the correct answer is that all of them are included.

Hyper is known for its effectiveness against various woody species and can be particularly useful in areas where trees and shrubs need to be managed. Velpar, on the other hand, contains the active ingredient hexazinone, which targets a wide range of woody and herbaceous plants by inhibiting photosynthesis, making it effective in forest management and right-of-way maintenance. Spike contains the active ingredient tebuthiuron, which is also effective in controlling woody plants by disrupting plant growth processes, making it suitable for controlling unwanted vegetation in areas such as railroads and utility rights-of-way.

Since all three products can effectively manage woody plant populations, the choice of them collectively as effective herbicides reinforces the importance of selecting the right chemical for specific vegetation management needs. This knowledge is crucial in integrated weed management strategies, especially in right-of-way maintenance where controlling woody plants is often essential for safety and access.