Q.salix flamingo
It has mass groupings of bugs like beetles/crabs on the main stem and some branches. What can I use to treat them? I am also concerned that they will go across to my other plants.

Alisma
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on October 30, 2016
These look like scale insects. See these articles for help:
http://ipm.ucanr.edu/PMG/PESTNOTES/pn7408.html
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm
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