Ed Fackler mentioned hoppers and stress as two factors leading to what has
been called "Honeycrisp Yellows" For more info on this you could visit my
website
go to Honeycrisp on Antonovka and then "More on Honeycrisp" Specifically
you would want to go to "Hopper Burn and Honeycrisp Yellows" which is the
last part of the "More on Honeycrisp" section.