Are you sure it is plum curculio? The damage from this pest looks like a tiny moon shape that the female makes with her ovipositor, then she lays the egg there... is this what you are seeing? https://www.canr.msu.edu/ipm/diseases/plum_curculio

If this is the case, beetles are hard to control. I am assuming you do not have a pesticide license to purchase chemicals that are restricted use. The best thing I can think to spray is Sevin. This material is not long lasting, but it will knock down beetles, but you will have to spray it a few times. They will be active when temperatures are over 65 degrees F in the evening, so be ready to apply when temperatures warm!

There are other pests of apples, so let me know if you have pictures you want me to look at!

Nikki Rothwell

Yes, plum curculio for sure. Try Sevin as soon as it warms up. You can buy this product at a home and garden store. It will knock them down. The good news is that they only have one generation for year (now... climate change is suggesting otherwise for the future), so once they have moved through, you should be done with them.

Good luck!

I think those look like frost rings... we see it happen to both pears and apples when we get a cold snap in the spring. Perhaps your pears were at a different timing if there was a cold stretch the may have damaged this fruit rather than your apples. Attached is a picture, which is what I think your pears may look like once they size. 

Let me know if this might be the case.

Nikki