I believe Harvestman has said to do that and I have for the second year.

I've never sprayed Immunox before bloom.

I mix it with Triazicide and do my first spray after petal and once more 14 days after. I spray all my fruit trees that are listed on Immunox label.

I have been using the combo for 6 years but also add a 'sprayer sticker'. Works like a charm.