Aerial agriculture to the rescue

Across Australia, aerial agriculture aircraft have proven invaluable in fighting fires, plagues and oil spills. Pilot skill and aircraft manoeuvrability and adaptability have made air ag planes an essential resource in combating threats to Australia's agriculture and environment.

Listed below are some of the problems that aerial ag aircraft and pilots help to solve.

Locusts:

  • Locust plagues can devour crops at an enormous rate and the highly mobile nature of swarms and their ability to migrate over large distances means that virtually all agricultural areas are at risk from damage.
  • Aerial agricultural operators are essential to Australia's fight against plague, migratory and spur-throated locusts with aerial spraying of insecticide as the principal method of control. Swarms are sometimes located in rugged terrain and must be stopped before they reach cropping areas. Ag aircraft are rigged to disperse the appropriate chemicals in a professional and accurate manner and are the quickest and most efficient means of attack.
  • Air ag operators carry out spraying under contract to the Australian Plague Locust Commission and various State Government agencies. Differential Global Positioning Satellite (DGPS) units are also fitted to spray aircraft to ensure the precise application of insecticide within the target area.

Fire-bombing

  • Ag pilots and aircraft have played a vital role in fire fighting in Australia for the last 50 years. The experience and training of ag pilots is valuable in fire fighting, as is the manoeuvrability of the plane. Experience in low-level flying, topdressing and flying in less than ideal conditions gives air ag pilots ideal skills for fire-bombing work.
  • The rapid response capacity of the fixed wing aircraft together with its cost-efficiency makes it a useful fire-fighting tool
  • Dropping foam to suffocate the fire or retardent to prevent fuel from burning, ag pilots can fly 10 to 20 metres above the blaze, controlling the drop to suit the conditions. Most contracted ag aircraft have sophisticated, computer-controlled fire doors that can drop the load onto the fire within seconds, split it over different areas or string it out to create a containment line.
  • Aggressive initial attack makes fire-bombers an essential part of the coordinated fire response. Agricultural aircraft in fire-fighting also help protect houses, sheds and on-the-ground firefighters from dangerous and difficult to control conditions. Millions of dollars of assets and environment have already been saved by the use of ag aircraft in this role across Australia.
  • Aircraft are particularly helpful with small fires, such as lightning strikes, when a fast initial response can stop the fire's progress. Aircraft can also reach rough and remote terrain to control the fire until ground units arrive.

Mice and rat baiting

  • The day-to-day checks and controls applied to aerial agriculture have prepared operators and pilots for distribution of a number of chemicals and baits, including mouse and rat bait.
  • Bait is dropped from about 20 metres and can cover large areas very quickly, targeting mice with four grains per square metre - killing at least four mice per square metre. GPS systems are used to mark the target area and report on drop areas.
  • Bait contains sterilised wheat grains, coated in zinc phosphate powder and encapsulated in sunflower oil.
  • Air ag is also being used to trial rat baits, which use a higher dose of poison of four grains per paper satchel.

Oil Spills

  • Australia has used aircraft to combat oil spills since the late 1970s.
  • Dispersants are dropped on the oil spill to reduce the size of oil drops so that they may be more readily consumed by bacteria and to decrease or prevent the spill's impact on the shoreline, birds and marine life.
  • Ag aircraft and pilots are perfectly suited to controlling oil spills because there is a wide spread of operators within striking distance of the coast and the aircraft are already rigged for chemical spraying.
  • The aircraft are able to reach and negotiate oil spills with greater speed and efficiency than boats, which have limited operational ability.

Fire Ant baiting

  • Air ag plays a vital role in the baiting of the South American Fire Ant (Red Imported Fire Ant) which was detected in Queensland in 2001 and destroys crops and native fauna and can have a sever impact on human lifestyle.
  • Agricultural helicopters will spread fire ant baits across 80,000ha per year. Two helicopters will spread the bait four times a year over 20,000ha of land which cannot be accessed by foot - that is, properties of 10ha or more or with inaccessible areas such as bushland or steep slopes. A further 20,000ha will be baited four times per year by hand.
  • With the majority of baiting to occur in sensitive urban environments, strict environmental management systems are required. To ensure that all stakeholders including the public were satisfied with the safety of the operation, the highest standard of environmental management, ISO14001, has been implemented.
  • The ant baits are made of methoprene, a substance normally used to treat mosquitoes and safe for use around watercourses. The baits are in the form of corn grit and sterilise juvenile fire ants to prevent reproduction. The fire ant population therefore crashes dramatically and the infestation is contained. The bait is spread at a rate of 2kg per hectare via helicopters which carry up to one tonne - covering an area of 500ha per load.