Fruit tree leaf damage

Question: I have 7 apple trees and 1 plum. There is leaf damage to everything in my tiny orchard and only my Chestnut Crab, Zestar Apple and Pembina Plum set fruit this year in average to below average quantities. Both of my young (but still 3 years apart) Kindercrisps that gave me just a couple of apples last year set 0 apples this year. My Frostbite that is strong and robust only set 2 apples this year. My oldest and biggest tree at approx. 8 years old is a  Honeycrisp and it gave me the finger again this year. All of my trees blossomed robustly this Spring although I didn't see a ton of pollinators but there must have been plenty round because my plum and 2 apple trees have set some fruit. The photos that I have attached show leaf damage on both apple and plum trees and something is chewing on the plum fruits also. There is also some web looking white stuff in 3 of the photos. Not sure if it's all the same critter or not. I did not find identical pics on any of my web searches so far. 
Thanks in advance for any help!

responder: Maureen Graber  Replied June 12, 2023, 7:54 AM EDT
response: Good Morning Andy,  Thank you for contacting the U of M Extension Service.  Please click on the following link from the U of M Extension Yard and Garden website about growing apples: https://extension.umn.edu/fruit/growing-apples   Please read through the information to ensure your trees are well cared for and getting at least 8 hours of sun per day. Did you prune them in late winter? Please read through all the information including the watering, weeding and fertilizing section.  2022 was a drought year for most of the state. If you had drought conditions in 2022 did you water the trees regularly? This could be the result of drought stress from previous years.  Here is a link to the result of "What's wrong with my plant?" from the U of M Extension Yard and Garden website: https://apps.extension.umn.edu/garden/diagnose/plant/fruit/apple/ There are several pests that might be eating the leaves of your trees: https://apps.extension.umn.edu/garden/diagnose/plant/fruit/apple/leavesholes.html You might inspect the trees again to see if you can identify a pest chewing on the leaves.  Here is a link to the possible webbing pests: https://apps.extension.umn.edu/garden/diagnose/plant/fruit/apple/branchwebbing.html Here is another link about growing stone fruit and possible pests for your plum tree: https://extension.umn.edu/fruit/growing-stone-fruits-home-garden#insects-2836760 If you scroll down to insects, you find a discussion of https://apps.extension.umn.edu/garden/diagnose/plant/fruit/apple/fruitdrop.html plum curculio. This could be the issue with your plums.  Good Luck!

responder: The Question Asker Replied June 12, 2023, 8:56 AM EDT
response: Good Morning and thanks for your prompt reply!Thanks for all of the links that you provided. I had already read all of the information that you provided links for and was not able to definitively determine the cause of my leaf damage based on the photos and literature cited. Is there a fruit tree entomologist in the Crookston area that I could consult with for further help? Thanks,Andy Hall<personal data hidden>

responder: The Question Asker Replied June 12, 2023, 9:01 AM EDT
response: Here are some additional photos of the damaged leaves of my apple and plum trees.Andy Hall

responder: Maureen Graber  Replied June 12, 2023, 10:51 AM EDT
response: Andy,  This is the response I received from the experts:  Hi Maureen - He could try contacting Ian McCrae in Crookston: https://projects.sare.org/people/imacrae/Julie Weisenhorn, M.A., M.AgAssociate Extension Professor and EducatorUMN Department of Horticultural ScienceMyers Education CenterMinnesota Landscape Arboretum, 3675 Arboretum Dr, Chaska, MN 55318

responder: The Question Asker Replied June 12, 2023, 12:19 PM EDT
response: Thanks so much! On Mon, Jun 12, 2023 at 9:51 AM Ask Extension <<personal data hidden>> wrote: