Blackish frass on the trunk and branches? Weak and lethargic growth? Sucker growth and sun scald cracks? Small greyish bumps in the bark and branches? You more than likely have a tree with gloomy scale insect. This pest will be the eventual demise of your prized landscape centerpiece.
Some damaging insects go unnoticed because they don't look like the bugs we have all come to either love or hate. Gloomy scale is one of those bugs (not even technically a bug). They don't have legs or wings, they are barely visible and are not among the usual suspects when we think of plant damaging pests. They, like other scales, are responsible for the slow, eventual death of our treasured landscape items. Fortunately, there is a newer insecticide that will perform genocide on these pests. An application to the trunk of the tree will give 100+ days of persistent residual...impossible for a new generation of gloomy scale to take place. This method will also reduce to near nothing the environmental impact like conventional insect control methods.
I am here to give you some good news: I can control this devastating pest. It requires one application per year, two years consecutive. The application is called a basal bark application. It is applied directly to the trunk of the tree, the lower branches and the trunk flare eliminating the need to spray the entire tree. The spray is soaked in to the bark and into the vascular system of the tree. One application persists for over one hundred days. Larger trees with thicker bark may need an additional application.
This application is pricey but it's cheaper than removing the tree and replacing it. Here is an example of the choices you have:
1) Gloomy scale control for one maple tree 12” diameter:
Approximately $160.00
2) Cut down and haul away maple $650.00
Grind stump, remove debris $240.00
Plant 8 ft. (2 in. caliper) $490.00
That is an investment north of $1,000.00. On top of that, you have to keep it watered through its establishment period which could be at least two years. It pays to care for the tree you already have.
Here are some pictures of gloomy scale:
https://www.google.com/search?hl=en&tbm=isch&source=hp&biw=1417&bih=641&ei=9hN5XoGTPI2JggfN95qoDw&q=gloomy+scale+on+maple&oq=gloomy+sca&gs_l=img.1.1.0l3j0i8i30l2j0i24l3.3885.12509..15875...0.0..0.80.695.10......0....1..gws-wiz-img.......0i5i30.YpBjO73QkQE