Wind speed has to be very low to ensure Bt is accurately applied to designated areas and no drift occurs. No rain within 24 hours of application increases the efficacy of the Bt. Remember, Bt is non-toxic to people, pets, birds, fish and most insects. Back to index What to Expect During Aerial Spraying When Mother Nature gives the go-ahead, airplanes will begin flying at dawn about 50 feet above the tree canopy. The effect is startling and can be frightening to some people.
Planes fly at dawn, because usually there is very little wind in the early morning.
The planes will fly until wind speeds increase. Planes may fly again in late afternoon if wind speeds are low and humidity is high. The spray can be accurately turned off and on to avoid opted out properties. Airplanes may fly over opted out properties, but no Bt will be applied. The media will be notified of the approximate date spraying will begin, so check the media in early May.