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The ryegrass dominant pastures of the Cradle Coast region are susceptible to damage from pasture pests, three in particular: the black- headed and red-headed cockchafers (BHCC and RHCC) and corbie grubs. Severe damage where top soil is deeper than 6 inches & rainfall is 500mm plus. Redheaded pasture cockchafer. Adults prefer to lay in pastures with a denser cover. This should be repeated 10-20 times to get an estimate of larval numbers. After spending two years underground, adult life above ground is short-lived. Mickan F. 2008. They grow to around 30mm in length and are all white except for the hind quarter which is a little swollen and more greyish in colour because of the ingestion of organic matter in the hind gut (Figure 2). This activity either damages the very vulnerable grubs and/or exposes them to flocks of birds and other predators reducing their effects post-sowing. Adults emerge in August to early October, fly locally and lay eggs singly in the soil, preferably in pastures with a dense cover. In Victoria the redheaded cockchafer, Adoryphorus couloni, (Bermeister) is periodically a common pasture pest, in the south west, central Victoria and Gippsland regions. They tend to be more prolific on lighter sandy loam soils. CONTROL. Their gut contents can often be seen through the external covering in medium to larger larvae. In wet autumns, damage from heavy infestations may not be apparent as the soil remains wet enough for the root-shortened pastures to survive and eventually recover, albeit in a much-weakened state. Areas of dense cover are preferred as this apparently aids survival of young larvae during spring and summer. Our unmatched beaches boast beautiful barrier islands and bays dotted with majestic lighthouses, fishing villages and scenic views. Use a shovel to dig to at least 20 cm depth in suspected areas of pasture to determine which species has caused the damage or if it’s a combination of both. Lifecycle, critical monitoring and management periods for the redheaded pasture cockchafer (Source: cesar and QDAFF). There are currently no synthetic insecticides registered for control of redheaded pasture cockchafers. Adults are chunky reddish brown to … Adults can be confused with dung beetles. Pasture scarabs and Corbie grubs attack roots just below the ground. Victoria 3052 Australia, privacy policy & terms | legal terms & conditions Birds, parasitic wasps and flies are the most effective natural enemies. The Redheaded Cockchafer, Adoryphorus couloni (Bermeister), is periodically a common pest, especially in areas of south-west and central Victoria and Gippsland districts. Government of South Australia PIRSA and GRDC. Adults do not feed. PestNotes are information sheets developed through a collaboration between, http://www.depi.vic.gov.au/agriculture-and-food/pests-diseases-and-weeds/pest-insects-and-mites/the-redheaded-pasture-cockchafer, http://www.dpiw.tas.gov.au/inter.nsf/Attachments/MCAS-8AD34T/$FILE/redheaded.pdf. Any research with unregistered pesticides or products referred to in PestNotes does not constitute a recommendation for that particular use. There is an entomopathogenic nematode, Heterorhabitis zealandica, which is used for control in turf and nurseries. It is also a pest in NSW (particularly in the southern tablelands), South Australia (lower south-east region) and Tasmania (northern area). PestNotes may identify products by proprietary or trade names to help readers identify particular products. 2007. Table 1. Observations of heavier infestations have been noted in under grazed pastures compared to adjacent pastures which had been well grazed. These new plants may survive as weakened and sparser pastures prone to weed infestation or may often die. Newer cultivars with greater tolerance To date, no endophyte has been identified which offers plant protection from the redheaded pasture cockchafer. PestNotes are information sheets developed through a collaboration between cesar and the South Australian Research and Development Institute (SARDI). The grubs feed on organic and root material in the top 100mm of soil. Blackheaded pasture cockchafer larvae live in underground tunnels, and rainfall and heavy dews trigger the larvae to leave the tunnels and move onto the surface to feed. After a brief period of flight, they return to the pasture and burrow into the soil to mate and lay eggs. If redheaded pasture cockchafers are a continual problem, consider sowing tolerant pasture species such as phalaris, cocksfoot, tall fescue, lucerne or less palatable crops such as oats. Their body is white-grey when feeding and turns to creamy-yellow colour as they mature. This requires pastures to have 2.5 to 3 leaves before grazing and a grazing residual height of about 5cm between clumps after grazing. Differentiating between black and redheaded pasture cockchafers, Head capsule is shiny brown to black within hours of hatching, Tunnel visible with dirt mounds around the entrance, Grubs move off quickly if handled or disturbed (approx. redheaded pasture cockchafer, Adoryphorus couloni, Victoria, Australia References Rath AC, et al. Redheaded pasture cockchafers seem to favour egg laying in longer pastures in spring for increased survival of its eggs and young larvae. The cockchafer grub, which is the larval stage of the life cycle, are typical white curl grubs which tend to form a C-shape upon exposure or when handled. 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