An adult five-spined bark beetle.
Galleries in pine bark made by Ips Grandicollis larvae.
The five-spined bark beetle (Ips grandicollis) is an established pest in Queensland's pine growing regions. It is usually a secondary pest, managed through good silvicultural practices. Beetle populations are also under biological control by two introduced parasitoid wasps.
Although Ips grandicollis is generally a secondary pest, it is important to manage it because it vectors blue stain fungi, which can severely affect the value and aesthetic qualities of milled timber.
Other names: Five-spined beetle, eastern five-spined engraver
Occurring in Queensland. These two species mainly attack the stumps or roots of dead trees, slash that is in contact with the ground, or large areas of clear fell residue:
Exotics. Bark beetles include some of the most destructive forest pests overseas, and many pose significant biosecurity threats to Australia. Some of the most important of these pests are:
There are concerns about the effects of climate change on this pest. Ips populations elsewhere in Australia are associated with large-scale tree mortality of drought-stressed pine trees. In Queensland in 1994, Ips grandicollis caused $10 million damage to fire damaged trees at Beerburrum. It is likely that the incidence of drought and fire will increase with the effects of climate change, meaning that management of this pest may become more important in the future.
Recently, Ips has been recorded attacking the trap trees used in monitoring and biological control programs for sirex wood wasp in NSW. This is preventing sirex from attacking the trap trees, and so it is reducing the effectiveness of these programs. Detecting sirex early and implementing biological control is essential for preventing sirex wasp outbreaks. Research funded by the National Sirex Coordination Committee and the ARC is examining ways to manage this problem.