Or that neighbors tree is going to work like a trap tree...*IF* they don't like what your serving for dinner. That is one method i've seen employed when using Surround WP (trap tree)... They'll come over and taste a little clay and decided unsprayed pear is better tasting...but yes, that tree is going to be a breeding ground for future generations, so its not like you are going to ever eliminate the problem or probably even reduce it...since i'm guessing even one female can lay a lot of future offspring.

I have the same problem.
Because they NEVER take care of the tree they are breeding more bugs than their tree can trap.
If barriers (clay or bags) aren't working sprays should kill enough before they do damage to get you some edible fruit.

I figure without my idiot neighbor I could get away with very few sprays per year. Because of him I often end up spraying as often as the sprays allow.

Do you have to be all organic? Because a spray schedule with Triazicide defeats the coddling moth.

Do you like pears? Ask the neighbors for permission to care for their tree in exchange for a % of the pear crop.

The trouble is, you are in Portland and surrounded by trees that might be breeding grounds for CM. Coddling moth can fly. They can come from down the block.

Maybe with hard work and a closely maintained schedule, you can get apples organically. But it is not the neighbor's tree that is going to defeat you.

CM is not very fond of pears. I would be very concerned if your neighbor had an apple or quince, but not pear. I don't even spray my pears against CM.

I would consider upping your weapons. If you want to be organic try confusion lures and codling moth granulosis virus. Or bag with ziplocs. None of the things you mention put a significant dent in CM populations.

Scott

Yes, even when I bag all my apples the CM don't touch the pears. How nice, if only it were the other way around. I'd let them have my pears if they'd leave the apples alone.