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start to reclaim small areas cover them with net or old sheets and spray that with garlic see if it deters them. Slowly you should be able to reclaim the entire area though the mango trees are going to be a challenge 1 step at a time we go

We have nets, but they are quite intelligent, they somehow manage to sneak in through it. And another problem is that these days a few birds got entangled with the nets, and we had to rescue them this season.