CW: Arachnophobia!!!

Spiders kill more "pests" than all of our methods for killing pests combined. While this robot is specifically for weeding, it's important to note that we don't actually need a wild technological solution to pest control. Techniques and strategies already exist that will be a million times cheaper and effective than spending money and electricity on expensive robots and their targeting systems. Cranberry farming has already embraced this - they sew the field with iirc hunstman spiders (or another non webspinning kind), and the spiders eat the pests. They need people who are really seriously not afraid of spiders because the way they harvest cranberries is by flooding the field with water, which causes all the cranberries to rise to the top, along with thousands of spiders. When this happens, they like to climb to higher ground, which happens to be all over the workers (oh my god I could never).

Broad spectrum "pesticides" (as in, ones that aren't targeted to one organism or a group) don't just kill pests, they kill everything. In fact, the spiders are going to die first because, like tuna accumulating mercury, they build up higher amounts from their prey. Not only do pest species often become resistant to pesticide, but they end up with no predators at all. We don't need to make mechanical pest killing machines, we need to start utilizing the biological ones that already exist and are way more cost effective. People just don't like spiders, though, and the current system gives Monsanto a bunch of money, so they're not going to stop.