Q.Something Is Decimating My Stags Horn Sumach
over a very short period of time ‘something’ is skeletonising my stags horn sumach. I presume it is an insect, but it must be either a swarm, or a very big one! should I spray it with insecticide? I am awaiting some castile soap from amazon to make my own spray. thanks for any advice.

Certified GKH Gardening Expert
It does appear that it could have been caused by an insect, but I would opt for a fungicide, as well! This will stave off any of the negative effects of the insects' feeding.
Be sure to visit our page on Garden Pests for more information:
https://www.gardeningknowhow.com/plant-problems/pests
https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

thanks again Bush Doctor, for your helpful reply.