Unfortunately there are two separate definitions of systemic, one that a substance disperses throughout the system but the def that applies to myclobutanil is the alternate one that simply means penetrating the tissue directly beneath the surface where its sprayed. Why science hasn't come up with two separate words is beyond me- I'm just a dumb farmer. Just prune the tree down to the reach of your sprayer, I say. Easier to manage anyway.

jennybog, I've experimented with and used TBHs before. You can find photos of my TGHs on the flickr photo website (under 'txbeeguy'). If you have specific questions, I'll be happy to try and answer them. You appear to have not kept bees before; if this is correct, I'd recommend you do a little reading first and find out about some of the 'technical' aspects of beehive design such as the important concept of 'bee space'. There are a few other important considerations that are different between the standard Langstroth hive design and TGHs.

yes, it is very possible. In fact alot of people do just that. Your bees may die out but in a good swarm year a swarm will move back in and replenish the hive. The problem that you will have in your area is africanized bees, which wave invaded Florida. You will need to become some what of a beekeeper to handle them and make sure that you don't create a safe haven for dangerous bees.

I saw my neighbor remove a large nest by putting on elbow length leather gloves and then he encased the whole nest in a plastic grocery bag and plucked it off the wall. Also, I don't know if it's too late once the queen gets established inside the nest, but I have great luck with trapping. You can use a plastic wasp trap they sell in hardware stores with a little fruit juice in it, I think mine were 2 for 6 dollars or something. Or you can make your own by cutting the top off a plastic soda bottle, invert the top so the spout is down inside, duct tape all around to hold it together, then pour in some juice. Like I say, I put out the traps in spring, so the nest never happens. I don't know if it's too late now that there is a nest. I also get them nesting in the ground, it looks like an anthill but the hole is bigger and perfectly round. I take the tops off my big Yankee Candle glass jars and plonk them down over the hole, or I cut small plastic Poland Spring water bottles in half and screw the halves into the ground right over the hole. I leave them on the ground for a week or so until there are no more wasps flying around them.