Ruqayyah Snyder
Australia is home to more than 30,000 known beetle species, and the African black beetle (Heteronychus arator) is one of them. This species of beetle is native to Southern Africa but has been present in Western Australia since the 1930s. The African black beetle is considered a pest as it damages pastures and grasses, turf, and horticulture crops. In this article, we will explore the African black beetle's diet and the impact it has on Australia's agriculture industry.
| Characteristics | Values |
|---|---|
| Type of beetle | African black beetle |
| Scientific name | Heteronychus arator |
| Colour | Chestnut to shiny black |
| Length | 10-15mm |
| Food | Adults feed on the stems of young plants, both underground and above the soil surface. They also attack several cereal crops, including barley, triticale, and wheat. |
| Larval food | Roots of perennial grasses and potato tubers |
| Pest status | Adults are considered pests, and they can cause significant crop damage. Larvae are less economically important but can still damage crops. |
| Regions affected | Western Australia, particularly the wetter coastal regions |
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What You'll Learn
African black beetles eat pasture grasses and horticulture crops
The African black beetle, native to southern Africa, has been present in Western Australia since the 1930s and is now found in the wetter coastal regions of mainland Australia, from Brisbane in the north to Melbourne in the south. It is a sporadic agricultural pest and can be found in Western Australia, South Australia, Victoria, New South Wales, and Queensland.
African black beetles are a significant pest in horticulture, forestry, and turf. They feed on and damage pasture grasses and horticulture crops. They are particularly attracted to grassy areas and those with heavy mulching. The adult beetles are the main pest stage, while the larvae are less economically important. However, both stages can be pests, and they can cause severe plant damage.
The adult beetles feed on a wide range of plants, including pasture grasses, particularly newly-sown ryegrass, and perennial grasses such as couch and kikuyu. They also attack cereal crops, including barley, triticale, and wheat, as well as irrigated and dryland summer forage crops like millet and maize. They can also damage turf and affect its health and appearance.
The larvae are soil-dwelling and typically present for only three to four months each year. They can damage turf and underground crops, particularly potato tubers. They prune or completely sever the roots of perennial grasses, and in severe cases, the pasture becomes patchy and can be rolled back like a carpet.
To control African black beetles, it is recommended to inspect susceptible paddocks prior to sowing and monitor crops and pastures for larval damage. Seeding at higher rates and sowing less favourable crops, such as legumes, oats, and lucerne, can help reduce damage. Removing kikuyu grasses before seeding is also important, as they are a favoured food source for the beetles.
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Larvae of African black beetles eat roots of perennial grasses
The African black beetle (Heteronychus arator), also known as the black lawn beetle, is native to southern Africa and has been present in Western Australia since the 1930s. It is now found in coastal regions of mainland Australia, from Brisbane in the north to Melbourne in the south, as well as in coastal areas of South and Western Australia.
African black beetles are primarily plant feeders, with a preference for food crops and grasses. They are considered pests in Australian horticulture, forestry, and turf. Both the adult beetles and their larvae are known to attack pastures and cereals. The adult beetles are the main pest stage and are economically significant due to the wide range of plants they attack, including perennial grasses.
The larvae of African black beetles, while less economically important, can still cause significant damage to turf and underground crops. They are soil-dwelling and typically remain in the larval stage for three to four months each year. During this time, they feed on the roots of perennial grasses, pruning or completely severing them. In severe cases with high larval populations, pastures can become patchy and easily removable, resembling a rolled-up carpet.
To manage African black beetle infestations, it is recommended to inspect susceptible areas before sowing and monitor crops and pastures for larval damage in late spring to mid-summer. Additionally, delaying autumn sowing, removing kikuyu grasses before seeding, and applying insecticides or biological controls can help reduce damage caused by both adults and larvae.
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Adult beetles eat foliage
Australian black beetles, or African black beetles, are native to southern Africa but have been present in Western Australia since the 1930s. They are commonly found in the wetter coastal regions.
The African black beetle is 10-15mm long, and when it first emerges, it is a rich chestnut colour that changes to a shiny black as it matures. The adult beetles are the main pest stage, while the soil-dwelling larval stage is present for only three to four months each year.
The adult beetles feed on foliage, often in a line across a field. They can cause significant damage to crops, and their presence may indicate likely future crop damage. It is important to monitor crops and pastures for larval damage, especially in fields with a history of beetle infestation.
African black beetles are a type of scarab beetle, and their life cycles can take more than a year to complete. The peanut scarab, another species of scarab beetle, has a similar life cycle. The adults emerge from the soil after heavy storm rain to feed on vegetation, and the eggs are laid under peanut seedlings. The larvae overwinter in the soil and pupate in the spring.
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Peanut scarab beetles eat vegetation and vegetation grown from peanut seedlings
Peanut scarab beetles, also known as peanut beetles, peanut bugs, moon dragons, or cancer beetles, are small, flightless, dark brown beetles. They are native to China but have been introduced to several other countries, including Australia. These beetles are considered pests to peanut crops and are commonly found in regions with ferrosol soils, such as the South Burnett, Atherton Tableland, and the Darling Downs in Australia.
Peanut scarab beetles feed on vegetation and vegetation grown from peanut seedlings. The adult beetles emerge from the soil after heavy storm rain in late spring or early summer and feed on the foliage of young plants. They can also attack the underground stems of plants, causing the central shoots to wither and the plants to die. The presence of these beetles in peanut crops indicates likely future crop damage.
The life cycle of the peanut scarab beetle can take more than a year to complete. The female beetles lay their eggs under peanut seedlings, and the larvae feed on the taproots of the plants, causing wilting and death. The larvae have a yellowish chitin shell that they molt several times as they grow, and they can reach a maximum size of 10mm. The pupal stage is critical, as the beetle is almost motionless and vulnerable to dehydration. The final adult stage is reached in about 77 days under ideal conditions, with the beetles measuring around 5mm in length and living up to 20 months.
To culture peanut scarab beetles, a substrate of raw peanuts, oatmeal, wheat bran, and dried bread slices is commonly used. Additionally, slices of vegetables and fruits provide the necessary water content for the beetles. Peanut scarab beetles are also used as food for fish, birds, and small reptiles, and their arachidonic acid content is considered beneficial.
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Eucalyptus tortoise beetles eat eucalypt leaves
The African black beetle, a native of Southern Africa, has been present in Western Australia since the 1930s. It is known to damage pastures and grasses, turf, and horticulture crops. The adult beetles feed on the stems of young plants, often killing growing points and causing the central shoots to wither and the plants to die. The larvae prune or completely sever the roots of perennial grasses, causing severe damage to pastures.
The Australian cowboy beetle, on the other hand, is not considered a pest. The larvae feed on dead and decaying wood, while the adults feed on nectar.
The focus of this discussion, however, is on the Eucalyptus tortoise beetle, which feeds on eucalypt leaves. The Eucalyptus tortoise beetle, also known as Paropis maculate, gets its name from its behaviour of pulling in its antennae when threatened and its distinctive shape. Both the larvae and adult beetles consume large amounts of young eucalypt leaves for many months of the year.
The Eucalyptus tortoise beetle, native to Australia, has become a pest of ornamental eucalyptus in southern California since its introduction around 2003. It is known as the Eucalyptus leaf beetle in this region, where it lacks natural predators or parasites. The Australian tortoise beetle, or Trachymela sloanei, is a nocturnal feeder, actively feeding at night.
The Eucalyptus tortoise beetle is a significant concern in New Zealand as well, where it is invasive and lacks natural enemies to control its population. This has resulted in an alarming population growth rate, with both the larvae and adult beetles contributing to the problem by feeding on young eucalypt leaves.
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Frequently asked questions
The African black beetle, found in Western Australia, is a pest that feeds on a wide range of plants, including pasture, barley, triticale, wheat, millet, maize, and potato tubers.
The African black beetle's life cycle can take more than a year to complete. The adult beetles are economically important as they attack a wide range of plants. The soil-dwelling larval stage is present for only three to four months each year and is less economically important, but the larvae can still damage turf and underground crops.
To control the African black beetle population, you can dig and sieve the soil to check for the presence of larvae and adults before planting. Monitoring crops and pastures in late spring to mid-summer is essential to prevent larval damage. If you find larvae, you can try picking them out and releasing them elsewhere.
