Consider plants have survived just fine for three hundred and fifty thousand million years. Even modern plants provide sustenance to our close relatives without any formal farming whatsoever.
If your crops are failing, there's something wrong with your environment. If you have too many aphids, you need more birds. If you have aphids and birds, you probably also have ants - which you should keep, but draw away from your crops, and so on.
Homocentricism doesn't work for sustainable farming, down that route lays only pesticides. You need to consider your whole environment - and accept a yield below 100%.