Which denies food for the things that eat the ticks, leaving no predators for the ticks, making the ticks worse since they're not having their population controlled. And then those predators of the ticks, that were food for OTHER animals, have less food themselves and slowly the whole ecosystem collapses.
There's a reason that once you start heavy pesticides, you basically always have to do them from then on in that area. In a few years you've removed all the natural checks and balances
Remember how everyone was talking about bug populations dropping? Guess what's dropping now? Their predator, birds. The cycle is already here