Project reference: 1999-05
Pest Detection Surveys by Low Level Helicopter Flights
Project description:
Pest detection surveys in forests are currently undertaken using a combination of high-altitude aerial surveys, drive-through surveys and random plotting. lt has been suggested that additional survey methods could be used. Possibly, low level helicopter surveys could replace or enhance drive-through surveys, particularly for forests in remote locations, or with poor road access.
The feasibility of low level helicopter surveillance was investigated by conducting a pilot trial at Woodhill Forest in December 1998. The objectives of the trial were to quantify the probability of detecting an exotic pest or disease using low level helicopter surveys, examine their cost and efficiency, and develop methodologies for use in a follow-up trial.
Results from the pilot trial did not preclude the potential of using helicopters for pest detection surveys but indicated that more work needs to be carried out on distance and efficiency interactions, and on efficiency using different types of symptoms. Problems encountered with navigation and symptom distribution could be overcome in a second trial.
It is proposed to carry out a trial to examine the effectiveness of low level helicopter surveys by determining their efficiency of detection, and cost, compared with drive-through surveys. At least three observers would be used to test observer efficiency. Infection centres would be simulated by painting the foliage of groups of trees, or artificially defoliating trees, and flight lines would follow easily navigable features such as main roads with symptoms placed at various distances from these roads. This would provide information on efficiency at various flight line distances and allow a full cost/benefit analysis to be carried out. A report describing the results with recommendations would be written.
Research Provider:
Forest Research
