unable to spray dormant oil
Conditions were never right for spraying dormant oil this year. Either it was freezing every night or raining every day. Now the flower buds are starting to pop. Mainly I want to control aphids with the oil, so what's my next best option now that trees are budding? I really prefer a minimal spray schedule, at least until mid to late June when we get hammered with rose chafers.
Also a bonus question. When is the best time to add calcium to my tanks? That is mainly a foliar application, correct?