Downtoearthdigs
Answered on June 3, 2019
This could be a Scale infestation.
Isolate the plants to keep them from spreading.
Treatment is explained in the links below.
https://www.gardeningknowhow.com/plant-problems/pests/insects/what-is-soft-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
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