About a mile from my house is an abandoned field, with 3 keiffer pear trees, an apple tree which I'm guessing is a holland, and a yellow crab apple which I can't identify. The pears and crabapple have had no need for spraying this year or last year, the pears and crabs look great. The apple tree had great apples last year, but this year about 80% of the apples are wormy and eaten (?) up by various bugs.

Are crabapples more pest resistant than other apples? They're very dense, perhaps they're more resistant than other apples?

I planted a wickson crab this year, I'm wondering if I should plant another.

Thanks,