Hi Paula,

Thank you for contacting the UNH Cooperative Extension with your question about how to care for your mature apple orchard. I have included a link to the NH Arborist Association which includes a list of arborists certified by the association.

https://www.nharborists.org/

https://extension.unh.edu/sites/default/files/migrated_unmanaged_files/Resource000974_Rep1097.pdf  This fact sheet will provide you with information about how to choose an arborist.

I have also included links to fact sheets that discuss how to care for mature apple trees.

https://extension.unh.edu/sites/default/files/migrated_unmanaged_files/Resource000582_Rep604.pdf

https://extension.unh.edu/blog/2019/01/my-new-property-came-number-established-fruit-trees-what-are-basic-things-i-should-know-about

https://extension.unh.edu/sites/default/files/migrated_unmanaged_files/Resource005256_Rep7402.pdf

You should also have your soil tested to ensure it has the required nutrients so your trees will thrive. 

Here is the link for the UNH Soil Testing Services homepage, which has the address to send the sample to, as well as information on best practices for submitting a soil sample and other resources: UNH Soil Testing Services

And here is the link to the submission form specific to home yards and garden: UNH_soil submission form_Home Grounds and Garden

Please let us know if you have any further question