Sorry, I am no help at all with those pretty Zygos.
Gigi, you have some nice Phal blooms here.
Bud blast has many reasons, but I don't know how fertilizing can cause bud blast? The Cattleya looks to me like it was simply done blooming?
Spider mites? Wash them off to start with and can you move the Dendrobiums outside?
In the meanwhile - for those celebrating - Happy Easter
