Over this season I've narrowed down my black locust tree to having possible locust borer problems. I used an insecticide tree and shrub drench in June after seeing the tale tell signs, with a ring of wood dust on the ground.
There are little holes sporadically through the tree trunk and branches, and a few small limbs broke from the damage caused. They gave way after some stronger winds, which would have normally held up okay.
This weekend I noticed them crawling all over the the tree (Which seems common for this species in late August and September). Is it better to cut this tree down in November, or spray it with Sevin and try to save it? Will Sevin 500 work? I read Carbaryl is effective and there is a Sevin with Carbaryl in it, but only available for purchase over Amazon or online. No local hardware stores carry it, just the Sevin 500 series. Carbaryl seems to have some possible harmful side effects to humans (more than most chemicals used in insecticides) so I am thinking that's why Sevin with Carbaryl isn't readily available in my local hardware stores, like the Sevin 500.
I've had a previous question for more details earlier in the season: Tree not getting leaves in one section