Lyla Lindsey
Christmas beetles are a type of scarab beetle native to Australia. They are known for their vibrant colours and metallic sheen, ranging from golden brown to green, violet, and opal. With around 35 species across the country, they are a common sight during the summer, especially around Christmastime, as their name suggests. The adult beetles feed primarily on eucalyptus leaves, while the larvae, or babies, consume plant roots and decaying organic matter.
| Characteristics | Values |
|---|---|
| Number of species in Australia | 35-36 |
| Number of species in New South Wales | 21 |
| Number of species in Sydney | 8-10 |
| Food | Eucalyptus leaves, peppercorn tree foliage, plant roots, grass, decaying organic matter |
| Larvae food | Grass and plant roots, surface roots of eucalypts, roots of native grasses |
| Colours | Gold, brown, green, yellow, pink, violet, opal |
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What You'll Learn
Christmas beetles eat eucalyptus leaves as adults
Christmas beetles are a type of scarab beetle native to Australia, with around 35 species found across the country and 21 of them in New South Wales. They are known for their vibrant, metallic colours, ranging from golden brown to green, with some even exhibiting violet hues or an opal-like sheen. The adult beetles emerge during the summer, usually around Christmastime, and are attracted to lights.
Adult Christmas beetles primarily feed on eucalyptus leaves, particularly those at the top of the trees. They have a preference for open woodland habitats over forests and are often found in large numbers decorating gum trees. Their spiky legs help them grip onto the leaves as they eat.
The larvae of Christmas beetles, known as curl grubs, feed on grass and plant roots, as well as the surface roots of eucalyptus trees. They spend about a year developing in the soil before hatching at the end of spring, coinciding with the emergence of adult beetles around Christmastime.
The presence of Christmas beetles during the festive season adds to the cheer and joy of the holidays for many Australians. However, there are concerns about their declining numbers due to factors such as habitat loss, urban expansion, and drier spring weather.
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The larvae eat grass and plant roots
The diet of Christmas beetle larvae, or curl grubs, consists of grass and plant roots, as well as the surface roots of eucalypts. They spend a year developing in the soil, eating decaying organic matter and plant roots, particularly those of native grasses and other vegetation. The larvae hatch at the end of spring, and the adults emerge in the summer, usually around Christmastime.
The larvae are white and C-shaped, and they live just underneath the surface of the soil. They can be found in forests and woodlands, particularly in southern and eastern Australia.
To ensure a healthy food source for Christmas beetle larvae, it is important to keep your lawn well-nourished and watered. This will help the grass stay healthy and provide ample food for the baby beetles.
The adult Christmas beetles primarily feed on eucalyptus leaves, especially those at the top of the tree. They are also known to consume the foliage of introduced species, such as the peppercorn tree.
The most commonly seen species of Christmas beetle is Anoplognathus pallidicollis, which is brown in colour and grows up to 2 centimetres in length. It is found along the east coast of Australia, from Queensland to Victoria and some parts of South Australia.
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They are attracted to bright lights at night
Christmas beetles, native to Australia, are nocturnal insects that are attracted to bright lights at night. They are most active during the warmer months, particularly during the festive season. Their attraction to lights can be attributed to a combination of factors, including the light's brightness, colour temperature, and emitted heat.
Firstly, the brightness of the lights plays a role in attracting Christmas beetles. These beetles, with their shimmering metallic bodies, are drawn to well-lit areas, especially during hot summer nights in Australia. The contrast between the dark night sky and the bright lights may be a factor in their attraction.
Secondly, the colour temperature of the lights can also play a part. While traditional incandescent bulbs emit light across various spectra, including ultraviolet (UV) light, which insects like Christmas beetles can see and are attracted to, LEDs emit little to no UV light. Therefore, the type of lighting used can influence the number of beetles attracted.
Additionally, the heat emitted by certain types of lights may be a factor in attracting Christmas beetles. Many insects, including beetles, are drawn to the warmth generated by incandescent bulbs during chilly evenings. LED lights, on the other hand, produce minimal heat, making them less attractive to these insects.
The combination of these factors can influence the behaviour of Christmas beetles and their attraction to bright lights at night. While LED lights may be less attractive to beetles, other types of lights that emit UV light and heat may be more enticing.
To minimise the attraction of Christmas beetles to lights, the use of LED lighting is recommended. Additionally, turning off outside lights or closing blinds can signal to the beetles that it's time for them to move on.
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They are found in southern and eastern Australia
Christmas beetles are found in southern and eastern Australia. They are a type of scarab, and are large and chunky with metallic brown, yellow, or pink colours. They are easy to spot, with shimmering metallic bodies.
The most commonly seen species of Christmas beetle is Anoplognathus pallidicollis. It is brown in colour and grows up to 2 centimetres. It is found along the east coast of Australia, from Queensland through to Victoria and some parts of South Australia.
Christmas beetles emerge in early spring and are associated with Christmas. They are found in forests and woodlands, and prefer open woodland to forest. They thrive in pastures wherever trees have been left in place. They are a feature of the eastern Australian experience, with some common species being given English names, such as the Washerwoman and the rarer King Beetle.
The total number of Christmas beetles reported in the Sydney area has declined over the years as the grassy woodland areas are used for housing. An important habitat for them, the Cumberland Plain woodland, was once widespread in Western Sydney, but less than 10% remains.
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Their numbers are declining
Christmas beetles, a group of iconic Australian insects, are large, colourful beetles that emerge annually around Christmastime. They are noisy and clumsy fliers and are an important food source for birds, wasps, and possums.
While there is no formal monitoring program, scientists suspect that Christmas beetle numbers are declining. There is no long-term population data for any Christmas beetle species, but many people, including some experts, remember there being more Christmas beetles in the past. Anecdotal evidence suggests a compelling decline. For example, in the 1920s, they were reported to drown in huge numbers in Sydney Harbour, with tree branches bending into the water due to the weight of the massed beetles. Such a sight would be unimaginable today.
There are several factors that could be contributing to the decline in Christmas beetle numbers. One factor is habitat loss. Sydney, for instance, has experienced significant urban development, with the beetles' former habitat now replaced by brick, concrete, and tarmac. Additionally, the reduction of native woodlands, especially near cities and towns, has meant that beetles have fewer places to feed. Long droughts and dry conditions can also make it harder for their babies to hatch.
To address the decline in Christmas beetle numbers, efforts can be made to conserve and restore their native habitats. This includes preserving and planting native eucalypts and maintaining healthy, well-nourished lawns with native grasses. These simple actions can provide a diverse food source and habitat for Christmas beetles, ensuring their survival and allowing future generations to enjoy their annual appearance.
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Frequently asked questions
Christmas beetles in Australia eat eucalyptus leaves, peppercorn tree foliage, and the roots of grass and plants.
Christmas beetle larvae, often called curl grubs, eat plant roots and decaying organic matter.
Christmas beetles have shimmering metallic bodies and are often brown, yellow, pink, green, violet, or opal in colour.
