I second Sodfarmer on the fact apple maggots will attack any apple. I have problems with every variety I grow as well as all pears. Some years I use the nylon covers, others I spray. Neither solution is great. But as I am down to seven apple trees the nylon socks are my first choice. I can thin as I apply the socks. Its a PITA, but . . .
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No huevos no pollo.