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There is one thing for sure, it is either a pest
or a disease! I have always said that fruit growing is a scientific
art...or is it an artistic science?! With over 11,000 trees now, I have
seen just about everything you cna get with apple trees and peach trees.
But I still have to pull out the reference books on a daily basis. As has been pointed out in several posts, both
pests and disease can cause leaves to curl. If it's a pest, there may be
no sign at all except the "honeydew" which can be seen if you move the leaf so
the sun reflrcts off the top side of the leaf. It looks like very small
drops of mineral oil. Disease is a little easier to identify in that there
are usually visible signs such as in the powdery mildew photos from the links
posted. There are 3 very good books that I would recommend for
both pests and disease if you are a grower, whether in your backyard or
commercially.
A Pocket Guide for Scouting Apples found at http://www.ipm.msu.edu/ApplePocket.htm
A Pocket Guide for Scouting Stone Fruits found at
http://www.ipm.msu.edu/Pubs_stone.htm
Diseases of Tree Fruits in the East available at
http://web2.msue.msu.edu/bulletins/keywordsearch.cfm
I use these three references on a daily basis and
highly recommend them.
Dennis Norton
Royal Oak Farm Orchard http://www.royaloakfarmorchard.com http://www.theorchardkeeper.blogspot.com http://www.revivalhymn.com
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