Curculio don’t reproduce well in pears, the fruit are too dense and crush the larvae. They mainly need plums or other stone fruits to propagate. I have never, ever seen one make it to maturity in a pear fruitlet and only one in an apple.
So I would not worry too much about the pear causing problems for your other trees.
@scottfsmith thanks for the reply. That does make me feel a bit better. Do you think perhaps though that it may still act as an attractant to my area in general?
It will attract some but the positive side is every bite on a pear is a bite not made on one of your fruit trees. So it could even be better overall.
I believe you . . . but I have to wonder why PC persists in laying eggs in a fruit that cannot serve as a suitable nursery. You’d think that the “attracted to pears” allele would vanish from the gene pool.
It might be too close to plums for them to distinguish. Their brains are pretty small to say the least.
Still, I have wondered the same question myself and I kept looking in bitten apples and pears for live worms but the worm paths never got thicker than a thick thread before disappearing. Except one crabapple which had very soft immature fruit.
" Plant it and they will come!"
Simple Answer - trees with apples that are untreated cause a PC explosion nearby. Spray the others with Imidan or Avaunt and you stand a chance. Have to admit the timing is tricky - both do a number on bees but if you do not hit the trees soon enough then the PC’s will be evident - too soon and you kill the bees.