No. In all likelihood, the birds’ death had a quite normal explanation. The weather. See my full article here:
and another of the media coverage, with links to some more examples of mass bird deaths.
But if you really want to go down the “chemtrail” route. Obviously if something were the result of spraying trails that are tens of miles long, a mile wide, and five miles up in the air, then the result would not be localized to one flock of bird in half a square mile.