Lyla Lindsey
Australia has a large number of native fruit fly species, with over 150 species present in the country. Two of the most prominent species are the Queensland fruit fly, which is native to Eastern Australia, and the Mediterranean fruit fly, which is an introduced species found in Western Australia. These flies pose a significant threat to Australia's horticulture industry, which is valued at $13 billion, as they can attack a wide range of commercial fruit and vegetable crops. The Australian government has implemented various measures, such as the National Fruit Fly Strategy, to control the spread of these pests and protect the country's valuable horticultural sector.
| Characteristics | Values |
|---|---|
| Number of native fruit fly species in Australia | More than 150 |
| Number of native species that attack commercial crops | 1 (Queensland fruit fly) |
| Number of exotic species threatening Australia's horticulture industry | 3 (Mediterranean fruit fly, Melon fruit fly, Mexican fruit fly) |
| Impact of fruit flies on Australia's horticulture industry | $6 billion in 2016-17 |
| Impact of fruit flies on international trade | Reduction in capacity to trade in horticultural markets |
| Australian government's approach to managing fruit flies | Surveillance, interstate quarantine restrictions, biosecurity rules, funding for the National Fruit Fly Council |
| Climatic factors affecting fruit fly distribution | Arid and semi-arid climates do not support natural dispersal and establishment |
| Fruit fly activity | Tends to increase in spring with warm temperatures and suitable host plants |
| Common host plants | Summerfruit, apples, berries, tomatoes, mangoes |
| Identification features | Larvae (tiny white grubs), pin prick-sized holes or scars on fruit surface |
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What You'll Learn
Australia's strict biosecurity rules to keep exotic fruit flies out
Australia has over 150 species of native fruit flies, most of which do not attack commercial crops. The Queensland fruit fly is an exception, as it affects crops in Eastern Australia. To prevent its further spread, domestic quarantine restrictions are in place, and fruit and vegetables from affected areas must be treated for the Queensland fruit fly before they can be sent to other parts of the country. Travellers are also prohibited from transporting fruit and vegetables across state lines.
Australia also has strict biosecurity rules to keep exotic fruit flies out of the country. The Mediterranean fruit fly, for instance, is an exotic species that has been found in Western Australia. Biosecurity measures are in place to prevent it from spreading to other parts of the country.
The Northern Australia Quarantine Strategy (NAQS) has fruit fly monitoring arrangements in place in the north of the country, as it is challenging for non-experts to distinguish exotic fruit flies from native ones. The Torres Strait, a small but significant part of Australia, is close to New Guinea, a serious biosecurity risk. Exotic fruit fly species from New Guinea move into the Torres Strait seasonally, aided by wind, vessel movements, and unauthorised foreign fishing activity. The Torres Strait Exotic Fruit Fly Eradication Program targets three exotic fruit fly species.
To prevent the introduction of exotic fruit flies, Australia has guidelines for travellers and importers. Travellers must not transport fruit and vegetables across state lines, and non-commercial fruit and vegetables in baggage or hand luggage must be destroyed unless the traveller has a valid import permit. Imports of fruit and vegetables must be certified as grown in a fruit fly-free region or treated to kill maggots. Before importing, people must check the Biosecurity Import Conditions system (BICON). Additionally, anyone who suspects an exotic fruit fly outbreak should call the Exotic Plant Pest Hotline, and signs of exotic pests and diseases in imported goods should be reported.
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Native fruit fly species in Australia
Australia is home to more than 150 species of native fruit flies, most of which do not attack commercial crops. However, there are two notable exceptions: the Queensland fruit fly and the Mediterranean fruit fly.
Queensland Fruit Fly
The Queensland fruit fly (Bactrocera tryoni), also known as the Queensland fruit fly (Qfly), is endemic to Australia and occurs primarily in the country's eastern states, including Queensland, New South Wales, Victoria, and the Northern Territory. This species poses a significant threat to Australia's horticultural industry, as it attacks a wide range of commercial fruit and vegetable crops. Domestic quarantine restrictions are in place to prevent its spread to unaffected regions, such as South Australia and Tasmania.
Mediterranean Fruit Fly
The Mediterranean fruit fly (Ceratitis capitata), or Medfly, is an introduced pest species in Australia. It is currently found only in Western Australia, particularly in the southwest region. The Mediterranean fruit fly is another destructive horticultural pest that can damage a wide range of commercial fruit and vegetable crops. Biosecurity measures are in place to prevent its spread to other parts of the country.
In addition to these two primary species, other native fruit fly species are present in Australia, such as the melon fly (Zeugodacus cucurbitae), which is occasionally found in the Torres Strait and is subject to ongoing eradication efforts.
Fruit fly numbers tend to increase during spring, when temperatures are warm and suitable host plants are readily available. These include summer fruits, apples, berries, tomatoes, and mangoes. To prevent the spread of these destructive pests, Australia has strict biosecurity rules and quarantine restrictions, both domestically and internationally.
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The Queensland fruit fly
The female QFF lays eggs inside host fruits and vegetables, with each female depositing up to 100 eggs per day. The eggs are white, 1 mm long, and banana-shaped, developing into maggots (larvae) that feed on the fruit, causing it to rot from the inside out. The maggots then exit the fruit and burrow into the ground, where they pupate and transform into adult flies. This lifecycle can be completed in around 30 days under optimal conditions of 26°C.
QFF is native to northeastern Australia, but rising temperatures due to climate change have expanded its range to other regions, including Polynesia. They thrive in warm and humid climates, making eastern Australia, New Caledonia, French Polynesia, the Pitcairn Islands, and the Cook Islands particularly susceptible to infestations. The ability of QFF to adapt to different conditions and tolerate high temperatures contributes to their spread.
To manage and control QFF, Australia has implemented strict biosecurity measures, including the National Fruit Fly Management Protocol and quarantine areas. These protocols aim to prevent the spread of QFF by restricting the movement of host fruits and treating or removing potentially infested produce. Home gardeners are also advised to monitor QFF activity and employ control methods to protect their crops.
The impact of QFF is economically significant, with predictions of increased financial losses in the agricultural sector due to rising temperatures. The Queensland fruit fly is a destructive pest that requires ongoing management to minimise its detrimental effects on Australia's horticulture industry and homegrown produce.
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The Mediterranean fruit fly
The scientific name for the Mediterranean fruit fly is Ceratitis capitata. It is a small fly, about 1/4 inch in length, with a yellow and brown body. The thorax is blackish with silver markings, and the abdomen is tan with darker stripes. The wings are clear with two light brown bands and gray flecks near the base. The eggs of the Mediterranean fruit fly are small, white, and banana-shaped, while the larvae are white, legless, and carrot-shaped. The pupa is contained inside a shiny brown, hard casing.
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How to identify fruit flies
Australia is home to more than 150 species of native fruit flies, with the Queensland fruit fly and Mediterranean fruit fly being the most economically threatening to the country's horticultural industry. Fruit flies are a common pest, feeding and thriving on the yeast and fungi that cause the fermentation of overripe, rotting fruits, vegetables, and organic matter.
- The most visible sign of a fruit fly infestation is the presence of adult fruit flies. These are usually seen swarming around fruits and vegetables left out on kitchen or commercial countertops or in and around refuse bins.
- Adult fruit flies are small, typically measuring about 3 mm (0.125 inches) long. They have red eyes, a brown/tan thorax, and a black abdomen.
- Fruit flies are attracted to odours associated with the spoilage of fruits and vegetables. They can be found in homes, restaurants, bars, cafeterias, farmer's markets, trash receptacles, and recycling areas, among other places.
- Fruit flies have a rapid reproduction rate and a relatively short lifespan. Under ideal conditions, a fruit fly egg can hatch in about a day, and the entire life cycle from egg to adult can be as short as 18 days.
- Fruit fly larvae (or maggots) are worm-like and pale white or yellow in colour, growing up to 7-10 mm in length when mature. They are often found inside fruits and vegetables, causing them to rot.
- Fruit fly pupae are yellowish-brown and about 3 mm long.
- Fruit flies can also be identified by their eggs, which are tiny (0.5 mm long), yellow, and rice grain-shaped. However, these are difficult to see with the naked eye.
- Check the outside of fruits and vegetables for bruises or blemishes, which may indicate that they have been stung by a female fruit fly for egg-laying.
- Fruit flies can be prevented and controlled by reducing the presence of ripe fruits and vegetables, maintaining proper sanitation practices, and using fruit fly traps.
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Frequently asked questions
Yes, Australia has more than 150 species of native fruit flies.
The Queensland fruit fly and the Mediterranean fruit fly are the two main species threatening Australia's horticulture industry.
Fruit flies pose a risk to most commercial fruit and vegetable crops. They can cause rots and discolouration.
The importation of infested fruit is the most likely way that exotic fruit flies enter Australia.
