Help identifying pests on Tangerine tree
I have a tangerine tree in my backyard that had some issues this past season and I am hoping someone can help me identify the cause and best treatment. We live in New Orleans. I took some of the leaves into a couple nurseries but got conflicting advice.
The leaves have a reddish brown rust color throughout. There are also grey spots all over the trunk and branches.
The tree produced very little fruit this year. The few it did produce also had a rust color and some dropped early.
I also have a satsuma tree next to this one that produced just fine but also has some grey spotting on the trunk.
I have been looking at a lot of pictures and am thinking scale or spider mites, judging from the coloration on the leaves? Not sure about the grey spots?
For treatment, we would much prefer oils or biological (for mites), rather than strong pesticides or systemics. We have a one year old who loves fruit :)
Thanks in advance for the advice!