Hello, please help! I have an Aromatnaya quince and a Comice pear that are suffering the same malady. Both are relatively young trees, been in the ground a couple of years, but they are both suffering from yellowing, puckering leaves, and the quince, especially, is failing to thrive. At this point I don't know if we're dealing with a soil deficiency, a fungal disease, or insect damage. The soil is rather poor and sandy, but we're working hard to amend that. Location: Whidbey Island, WA. Quince on the left, pear on the right. Thank you for your insights.