Q.White chalky mold at pruning sites
I Have a magnolia tree with white chalky spots about 3/8 in diameter at the pruning sites and when disturbed produces small black ants.This summer has been hot and humid.
Downtoearthdigs
Answered on July 19, 2019
This sounds like you may have a Scale infestation.
Treat with Neem Oil.
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm
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