This site is quite useful in helping determine growing degree days and phenology in your area to aid you in your decisions of when to spray and much more.
CFAES
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Buckeye Appellation
Buckeye Appellation
https://ohiograpeweb.cfaes.ohio-state.edu
https://ohiograpeweb.cfaes.ohio-state.edu
College of Food, Agricultural, and Environmental Sciences