This nasty bacterial disease affects apples and their close relatives, crab apples, mountain ash, pear, cotoneaster, hawthorn, pyracantha and serviceberry.
From the denverpost.com
Although you normally associate canker with apple trees it also affects, pear, mountain ash, beech, hawthorn, poplar and willow.
From the edp24.co.uk
Caterpillars hatch in nine to 15 days and start feeding on leaves'upper surfaces of pear, cherry, plum, almond, hawthorn, quince or flowering quince.
From the sfgate.com
In Hungary, Goldcrests stopping temporarily on migration were mostly found in scrub, including blackthorn, hawthorn and pear, which provided some protection from Sparrowhawks.