Pesticides on trees...
It is good to know the history of any tree branch before deciding a piece is safe to use.
Most popular pesticides put into general population use, why they seem to get banned after a few years in real world use. (DDT, diazanon...etc).
Some people will hose end spray a tree in their yard down once or twice, thrice a year with the super duper, genuine, official stuff, mixed up extra, extra strong , so as to drop them bugs dead in their tracks, with the slightest whiff of the latest and the greatest toxic nerve agent type of petro chemical insecticide.
(Bug juice Du Jour).
Avoid this type tree branch as they quite possibly may have a toxic residue that one may or may not be able to wash off..
Other people have trees and never use pesticides on them, those would be much more desirable, I would think.
I believe they have forests full of pesticide free trees, as of yet, in many places.
We have forests of sorts here in the Sonoran Desert, only with lotsa cactus's.
My caption for the following linked Saguaro cactus forest photo is "Where's Waldo?
http://www.a"mericansouthwest.net/arizona/saguaro/snpwide2_l.html