Which technique should NOT be used to deter vertebrate pests?

Leaving pet food outside at night is not a technique that should be used to deter vertebrate pests. In fact, this practice can attract a variety of unwanted animals, including raccoons, rodents, and even stray dogs or cats. These pests are opportunistic feeders and will be drawn to easily accessible food sources, significantly increasing the likelihood of an infestation or wildlife issues around your home.

On the other hand, the other techniques mentioned are proactive measures that help in reducing the potential for attracting pests. Trimming shrubbery and foliage makes it harder for pests to find hiding spots and reduces the cover they might use to approach the property. Securing trash cans prevents animals from rummaging through waste, which can lower the chances of attracting them to the area. Removing standing water eliminates breeding grounds for many pests, including mosquitoes, thereby reducing overall pest populations.

Thus, not only is leaving pet food outside counterproductive, but it also poses a risk of promoting further pest problems.