Another pest...
A few years ago, I had a Japanese Beetle infestation. They killed my hazelnut trees

and were everywhere. I got some Milky Spore Disease and spread that around. The grubs eat it, and when they die, the MSD spreads through out the ground. It was too late for my nut trees, but the beetles have been less since. ("Milky Spore uses the naturally occurring bacterium,
Paenibacillus popilliae" -- from the internet.)
Now that I have chickens, I collect all the Japanese Beetles I can find! And the grubs, when I'm digging in the garden. So far this spring, I have seen much fewer grubs than in years past.
MSD only affects Japanese Beetles, though. It was $80, on sale at the end of the season, so it isn't cheap, either. But it's a "once and done" because it lasts 15-20 years.