Fungicides as your all aware clear up a host of issues. I frequently get emails, messages and requests asking about these fungicides. Since immunox is not on the label I would not use it if fruit is on the tree because it is a systemic.
Something I find odd is many universities have recommended immunox on pears but the label specifically does not mention pears Spectracide Immunox® Multi-Purpose Fungicide Spray Concentrate For Gardens | Spectracide
Two commonly used fungicides are immunox and captain. Captan is commonly used on pears and inexpensive. Immunox can be used according to the guide below. Finding pears on the immunox label is not something I have seen but many field experts do recommend it. Ensure you wear protective wear especially for your eyes. As soon as you see issues clear up I would stop using fungicides again. I only spray when there is an issue and stop spraying when there is not.
More to analyze but when in doubt stick to captan
https://ask2.extension.org/kb/faq.php?id=720353
Copper is another fungicide I really like since it works on fireblight but again I would use it prebloom only and never again with fruit on the tree
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