Q.Orange trees
There is a sticky white substance on my Louisiana Sweet orange trees right where the frust meets the branch.

Downtoearthdigs
Answered on June 17, 2017
It could be Wooly Aphids, but an image would help with id of the pests.
Here is a link with more information.
https://www.gardeningknowhow.com/plant-problems/pests/insects/woolly-aphid-control.htm
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