Helicopter Spraying Christmas Tree Farm

My 4 month old son T.J. and I, watching out the window at the helicopter that comes and sprays the Christmas trees surrounding my house. I love living in the country, its very peaceful.....except for about 2-3 hours when this chopper comes around once a month to spray. The past couple of times this has happened has been at 6:30am. This time, thankfully, was at 12:30 in the afternoon. Although really annoying (it shakes the house), its kinda fun to watch.

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what are they spraying? why are you letting them do that so close to your home? do you think your not getting some kind of residuals from this?