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[Alan Haigh <alandhaigh@gmail.com>]

Wow, Dennis, that's an awful lot of applications to control fungus.  I get absolute control of scab and CAR with a max of 3 applications.  Most of the sites I manage don't have a lot of trees by commercial standards but some have a couple acres and often very large trees of susceptable varieties like Mac.  They often have huge trees nearby that used to be the same commercial orchard that was subdivided and the neighbor doesn't spray (or prune) at all and trees are full of scab and CAR while my trees are clean.  At these sites I make sure to include some Captan and rotate to  Flint in a petal fall ap. or the final ap. 10 to 14 days later.

 

After a dozen years I haven't had a problem with resistance, even at sites where I have only used Captan and Nova for the final 2 sprays, sometimes adding Captan only once.  I even get adequate control just spraying twice at petal fall and first cover.  Have you ever tried reducing your aps to see what happens?  Maybe my success is because none of my sites has more than 3 acres or so of trees.