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Buy the Stihl gas-powered leaf blower. Dont be a dummy and skimp on the CFM, buy the nice $700 one. Note the size of the opening whence flows the air.
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Visit your local grocer or produce stand and acquire some appropriately sized oranges, with a diameter to not quite overmatch the measurement from Step 1.
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Cram the orange in said opening and aim at the nearest wayward teen.
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Depress the trigger in an aggresssive manner. This is key. You do NOT want to half-ass it. Jam that fucker all the way down.
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Shoot some trees now so you can enjoy making marmelade-flavored havoc in peace; the teens having fled in panic.
Where on earth do you get that idea? Lower is more expensive, so unless youre a pro, you dont see them as often.