What's New in Biological Control of Weeds?, Issue 61
In this issue
How Cost-Effective Is Successful Weed Biocontrol in New Zealand?
A recent economic analysis by Simon Harris (Harris Consulting) and Simon Fowler looked at whether it has been cost-effective to release biocontrol agents against weeds in New Zealand.
New Agent Approvals
The Environmental Protection Authority (EPA) has approved an application to release the lantana leaf rust (Prospodium tuberculatum) and the lantana blister rust (Puccinia lantanae) in New Zealand.
Changes to Pages
If you are making an effort to keep your copy of The Biological Control of Weeds Book – Te Whakapau Taru up to date you need to go online and download some new and revised pages.
Biocontrol Agents Released in 2011/12
Seven species have been released this year at 138 sites around New Zealand.
Who Is Eating Our Agents?
When new agents establish themselves on host plants, they enter existing food webs and their effectiveness can be influenced by the presence of other species, either native or exotic. Interactions can occur between different insect species or can involve larger predators, and because they are not always obvious, they have not been well studied.
Never a Dull Moment with Woolly Nightshade!
A number of additional species have been found attacking woolly nightshade (Solanum mauritianum) in New Zealand since we undertook comprehensive surveys of its natural enemies in 2000/01.
Secrets of Wild Ginger Revealed
The two problematic species in New Zealand are known as kahili ginger (Hedychium gardnerianum) and yellow ginger (H. fl avescens).
Key Hurdle Cleared for Alligator Weed Project
The only aquatic weed we have attempted to biocontrol in New Zealand is alligator weed (Alternanthera philoxeroides).
International Effort Underway against Tutsan
Tutsan (Hypericum androsaemum) is an invasive weed that originates from Europe and has become a significant pest in the North Island.
Spotlight Finally on Privet
Privet (Ligustrum spp.) has a large native range, across Europe to eastern Asia and south to Queensland, Australia. There are approximately 40 species, but only four have been introduced to New Zealand: tree privet (L. lucidum), Chinese privet (L. sinense), common privet (L. vulgare), and Californian privet (L. ovalifolium).
Ecofriendly Agapanthus – Myth or Reality?
The typical large-growing form of Agapanthus, A. praecox subsp. orientalis, has become a weed that is increasingly worrying some regional authorities and environmental organisations.
Most biocontrol agents become active during spring, making it a busy time of year. Some activities that you might want to fit in over this time include ...
Who’s Who in Biological Control of Weeds?
Summary of biocontrol agents.
Recent staff publications.