Biosecurity fact sheet. The redheaded pasture cockchafer (Adoryphorus couloni) and the blackheaded pasture cockchafer (Acrossidius tasmaniae) have darker head capsules but are also easily confused. Blackheaded pasture cockchafers General unthriftiness of pasture, sometimes with sward uprooted by birds and stock. Any research with unregistered pesticides or products referred to in PestNotes does not constitute a recommendation for that particular use. Dissections of the adult beetles have shown they do not feed. Most damage becomes more obvious by May to early June. At about one year of age the larvae change to a creamy colour and move deeper into the soil in December and January to pupate in earthen cells. Government of South Australia PIRSA and GRDC. Tasmanian Department of Primary Industries, Parks Water and Environment. When fully grown they are 25 mm long. Copyright: © All material published in PestNotes is copyright protected by cesar and SARDI and may not be reproduced in any form without written permission from both agencies. Table 1. © cesar pty ltd
sustainability through science & innovation. Lifecycle, critical monitoring and management periods for the redheaded pasture cockchafer (Source: cesar and QDAFF). Fully-grown larvae are up to 30 mm long and curl into a ‘C‘-shape. April–October but especially April–June Redheaded pasture cockchafer and other root–feeding cockchafers. 2010. The main insect pests of perennial ryegrass in Australia are black field cricket, black headed pasture cockchafer, red headed pasture cockchafer, common army worm, common cutworm, pasture tunnel moth and cereal rust mite (Cunningham et al., 1994). Bailey PT. The damaging stage of the life cycle is the larvae stage, feeds underground on the roots of pasture species. Often both the red and blackheaded pasture cockchafers are present the same time in the same paddock. Redheaded pasture cockchafer. Redheaded pasture cockchafer damage showing patchy nature (Source: SARDI). Adult beetles are reddish-brown to black in colour, and are approximately 15 mm long and 8 mm wide. This activity either damages the very vulnerable grubs and/or exposes them to flocks of birds and other predators reducing their effects post-sowing. Low soil temperatures over the winter period slow down feeding activity. Above: Redheaded Cockchafer .
Figure 1 Photographer: Jon Augier Museums Victoria Figure 2 Department of Primary Industries, Parks, Water and Environment (Tasmania) Figure 3 Agriculture Victoria Figure 4 The South Australian Research and Development Institute (SARDI). Birds prey on larvae and are most valuable after cultivation. 2007. Other products may perform as well as or better than those specifically referred to. 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). Eggs are white, 2mm in diameter, oval-shaped when newly laid but become more spherical with age. Wheat has also been known to be stunted by this cockchafer. Rolling damp, but not too wet, pastures can be of use by re-establishing contact of the roots with the soil and killing larvae close to the soil surface. They tend to be more prolific on lighter sandy loam soils. The soil type at the site is a moderately acidic (pH 5.4 to 5.6) grey-brown clay loam. Roots in the top 10 cm of the soil are typically attacked. High numbers can also result in completely bare patches in the infested paddock from small isolated to very large areas. Roots in the top 10 cm of the soil are typically attacked. They remain at this stage until early the following summer. As larvae live entirely in the soil, chemical control is impractical particularly for the more damaging stages. Liming has been anecdotally linked to reduced cockchafer problems, although the results may be linked to long grass at beetle flying time and chance landing elsewhere. Redheaded pasture cockchafer is currently restricted to pastures in some areas on the Port Hills and Banks Peninsula, Canterbury, and also to amenity turf within Christchurch city This insect has a two-year lifecycle so serious damage may only occur once every two years The pupa is yellowish to gingery brown, 15 to 20mm long and forms in a cell constructed in the soil. Older larvae have six yellowish legs, a reddish-brown head capsule and a transparent body wall. Redheaded pasture cockchafers are a sporadic agricultural pest, and are native to south-eastern Australia. After a brief period of flight, they return to the pasture and burrow into the soil to mate and lay eggs. Adult is a dark reddish-brown to black beetle about 13mm long and 8 mm wide. The redheaded cockchafer has a life cycle of 2 years, most of it spent underground (Figure 3). Redheaded pasture cockchafers seem to favour egg laying in longer pastures in spring for increased survival of its eggs and young larvae. The Redheaded Pasture Cockchafer, Department of Primary Industries, Melbourne, Victoria, Agnote 1358. http://www.depi.vic.gov.au/agriculture-and-food/pests-diseases-and-weeds/pest-insects-and-mites/the-redheaded-pasture-cockchafer, Tasmanian Department of Primary Industries, Parks Water and Environment. Mapping redheaded cockchafer infestations in pastures - are PA tools up to the job? All stages except the beetle live their lives below the soil surface. Although typically found in higher rainfall areas, they tend to occur in higher numbers and are more of a problem in drier years. The new seedlings have little residual energy stored in their lower stems to aid recovery. And other root–feeding cockchafers in a substantial reduction in their lower stems to aid recovery known to be stunted this... Which of the life cycle is the main indication of their presence to aid recovery oval-shaped when newly but... They appear to be stunted by this cockchafer adult females to lay in with... 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