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Having bugs that eat psillids doesn't help your trees; one bite from an infected psillid (assume they're all infected), and your tree(s) is doomed.
I too have my doubts about predators helping prevent your trees from becoming infected, though if implemented on a wide scale they may help reduce the spread of HLB. The simple fact is by the time infected ACP show up on your property the chances of the predators getting all of them before any of them feed on your citrus trees is very low. Think of it a bit like the old video game Missile Attack, it only takes one getting through.
Right. It could still help if maybe 1 in 1000 psyllids carry HLB. If you can eliminate half of that population (via predators or pesticides), you have a good chance of removing the 1 that's critical. That's why they remove all the infected trees, to reduce the amount of HLB available for the psyllids to spread.Since predators only respond to the prey's population, there's always going to be casualties if nearly all the psyllids carry HLB, which is not the case yet. Predators can't have a large population if there's no prey to feed on. Predators either leave or die off.