Brush pile bass tactics can be very tricky but yet very productive.  Since you are targeting fish that are holding in or around a tree, you must be very careful not to get hung up.  There are several different approaches that you can take when targeting these bass.  One tactic that anglers use primarily in the spring time are to horizontally pull soft plastics and jigs by the brush pile.  Like explained above, many bass will hold in the brush in shallower water during the spawning period.  Since these bass are very aggressive, they will attack these baits that are slowly going under them.  Another tactic that anglers like to use is to pull weed less worms and jigs directly through the brush.  The action of the bait catching on and then falling from the tree limbs makes it look very realistic.  Bass will often it attack the bait as it falls from the limbs.  The third tactic that some anglers use are to mark the brush pile with a marker buoy and they throw various crankbaits and jerkbaits around the brush.  Bass will see these baits flashing by and will think it is a baitfish.  This tactic can be used year round but it is necessary that you have good electronics to pinpoint the exact position of the brush pile.  The last tactic that is often used in the fall in winter is vertical jigging.  When the waters cool down, bass and other species tend to hold on structure for long periods of time.  Finding a brush pile with fish on it with your electronics and then sitting over it jigging with spoons and jigs can be very productive when the fish slow down.  No matter the tactic or the situation, brush piles are a great place to catch large quantities and good quality fish.