Tour participants watched a demonstration of how smoke is laid down by aerial applicators to test wind direction to mitigate off-target pesticide drift at Provine Helicopter, Inc., in Greenwood, Mississippi. (Photo credit: Delta Council) Leave a Reply Cancel reply Search Search for... Search Get New Posts in your Inbox! Enter your email address to subscribe to Entomology Today. You'll receive notifications of new posts by email. Email Address Get Certified!