Oh yeah, I forgot to mention that Rose Defense is fine for edibles as it is neem oil from the neem tree in India (Indian people used this to brush their teeth with-- totally safe), and horticultural oil is primarily mineral oil (another thing that humans can ingest safely-- is actually a common laxative!) The neem oil will kill pests and diseases, whereas the horticultural oil will only kill pests by smothering them, but it will also seal up the cuts made by pruning. Since your Blueberries are at a delicate time right now with their health, it is best to protect them since they will be attractive to pests now that they are stressed from their disease.