Yellowing leaves on beallara's new growth

[Roberta]

Physan doesn't do anything for bugs of any sort unless it drowns them (soapy water is at least as good if not better for that) . It is good for algae and some fungal issues. For insects (mealy bugs, scale, thrips, etc.) an imidacloprid preparation (such as Bayer's 3-in-1) is systemic and also kills on contact. It supposedly contains a miticide as well, though for a serious spider mite infestation something more specific would probably be better. But don't choose your treatment until you know what you are treating!