Preventative fungicides to prevent crabapple diseases are recommended to be sprayed just before bud break (blooming).  Typically that isn't until late March…except for this year.  Our spring is about 3 weeks early this season and Crabapples are breaking their blooms right now.  We recommend a minimum of two treatments with a preference of three.  Timing should be approx. 15-21 days apart.  Please let us know if you are interested in this service.