The chemicals you mentioned are all good, but it mainly depends on the local resistance. For powdery mildew, xanthate from ethirimol or ethirimol, ethirimol, tetraconazole or triflumizole from ningnanmycin can be used. You can also use Lunasen or green princess, which is too expensive. If it is serious, you can buy some triadimefon or thirteen morpholine single-spray furrows and floors.
Botrytis cinerea can be used alternately with procymidone, metronidazole, boscalid, pyrimethanil or fluorobacteria and iprodione to reduce humidity, remove old leaves, spray evenly, and add additives under mixed conditions, preferably spraying on the ground.