Dothistroma, or needlecast fungus was accidently introduced into the NZ Pinus Radiata forests in the 1960's.
Extensive aerial spraying has been carried out now for many years.
Below are some photographs taken by Des Smith showing his part of the 1975 operation.
ZK-DDA on the military strip at Waiouru in 1975.
Above ZK-DDA reloading near Rotorua November 1975.
The Team line up at Kaingaroa in November of 1975. ZK-DDA nearest.
Above ZK-DDA on take off from the Iwatahi strip, 1975.
Two shots of ZK-DDA at work.
For a better understanding of Dothistrama go to the following link :-