You would have to use a crop duster aircraft to do any good over an area, we'er not talking about millions of them, we'er talking about several billions of them.
When we had them in our area you couldn't walk anywhere without stepping on hundreds of them.
Then, one year they were just gone, don't have any idea why, but thank God they were gone and haven't seen any since for about four decades now.
You can have them ALL back