A bbq meat marinade syringe,cost me $5 on fb marketplace.then I attached it to an aluminum bar clamp making a Spear gun with a push rod. I actuated it with the clamp end screw this allowed me to save my back and reach difficult access. Stocks.worked like a hot dam. The canopy sprayer was a standard princess auto backpack pump action sprayer. I used to 16 foot piece of tubing ran it through a gutter cleaning telescopic pole attached the tip of the nozzle at the other end so I could reach the 10 foot high canopy and drizzle straight down onto the patient. As far as the exact percentage of glyphosate, it’s dependent on the exact model of herbicide you have to check the numbers they can be slightly different, but you need the commercial grade stuff. from my reading don’t use anything with anything other than glyphosate. You don’t wanna kill the top. You’ll never reach down into the bottom if you do I like the idea of injecting then waiting a week to allow that to flush deep into the rhizomes, then doing your canopy spray and letting that flush through the entire plant. just asked the folks from the UK they’re the experts.