I’m trying to hit it every 2-3 weeks until late June. Maybe it will work.
I'm going hard on mine this year too. My quince really like to get rust, and my ume always seem to get black spot.
Just finished a three week course of Immunox, moving on to three weeks of Bonide Infuse spray, and then finally three weeks of Phyton. This is in addition to infuse granular and Cleary's 3336 granular with a month break between them. If that doesn't work... well, jeeze.
Be nice to not HAVE to defoliate one of these years
Was thinking of putting Mancozeb in there too but I feel like I'm already going full nuclear, and don't like the temporary discoloration.
On the plus side, I think I can chill on the pesticides because I've really never had a problem with infestations.
Just waiting for my trees to start glowing from all these chemicals...