Video | Business Headlines | Internet | Science | Scientific Ethics | Technology | Search

 


Introduced insects not such a pest


Introduced insects not such a pest


Lincoln, New Zealand 14 January 2014... Concerns are often raised about the introduction of non-native insects around the world to control weeds, citing the risk the introduced insects may cause to other desirable plant species. Yet a new study suggests there may not be as much evidence for this concern as people perceive.

An international collaboration - including Max Suckling of Plant & Food Research in Lincoln, New Zealand and René Sforza of the European Biological Control Laboratory in Montpellier, France - has completed a study on the effects of all recorded cases since the 1800s of insects as weed biological control agents thanks to funding from an OECD Fellowship and as part of NZ’s Government funded Better Border Biosecurity programme (www.b3nz.org(http://plantandfood.us5.list-manage.com/track/click?u=1b46d14e528ad30bae8b3663c&id=70ffed9fa9&e=5b367992d8) ).

The research characterised the magnitude of unwanted effects by these insects on other plants using a five step scale adapted from invasive species biology and looked at 512 cases of deliberately introduced biocontrols dating back more than 150 years.

Dr Suckling said “A total of 43 weed biocontrol insects worldwide have been reported to feed on non-target plants after release, but the real surprise comes when you look at the level of this feeding and what little effect it is having on the plants, compared with calls for concern about biosafety in the scientific literature”.

The study particularly looked at whether insect feeding affected the reproductive rate of the non-target plant and discovered decreases in plant reproduction in non-target plants to be very rare.
The scientists found only four insects causing plant populations to decline significantly anywhere.

“Weeds are a major long term drain to our quality of life. Our concern is that worry about biosafety needs to be tempered with the benefit scenario. Our analysis shows that as far as is known, weed biological control agents have historical had an excellent biosafety track record, with more than 99% of cases avoiding significant non-target impacts on plant populations” says Dr Suckling.

“Biological control of weeds through the introduction of specific insects is an environmentally sustainable solution compared to chemical sprays and an area of science we aim to investigate further” notes Dr Sforza, currently visiting New Zealand on an OECD Fellowship for biological control.

The study estimates that in the nearly 85 year history of weed biological control in New Zealand, 34 % of insects deliberately introduced against weeds have worked successfully, in some cases with real benefits. Two key success stories have occurred from insects introduced to control St John’s Wort and Ragwort, with long-term ecosystem recovery over large areas.

The study notes that in future it is expected that even fewer non-target impacts and greater benefits can be expected due to improved science and increased incorporation of wider societal values and that suitably-screened organisms can be released with a very high degree of specificity against weeds. The research paper is available online in PLoS ONE (10.1371/journal.pone.0084847).

View the research paper online
PLoS ONE – article by Suckling and Sforza,
What magnitude are observed non-target impacts from weed biocontrol? (http://plantandfood.us5.list-manage1.com/track/click?u=1b46d14e528ad30bae8b3663c&id=5f3a0792d9&e=5b367992d8)
10.1371/journal.pone.0084847 (http://plantandfood.us5.list-manage2.co

ends

© Scoop Media

 
 
 
 
 
Business Headlines | Sci-Tech Headlines

 

Bad Day For Rope: Donaghys Job Losses Another Blow To Dunedin

The loss of 30 jobs from Donaghys rope and twine factory is yet another blow to the people and economy of Dunedin, says Dunedin South Labour MP Clare Curran. More>>

ALSO:

Oil: 2014 New Zealand Petroleum Summit

Simon Bridges: Our abundance of energy and minerals resources provides us with unique opportunities to build the New Zealand economy.

Over the past three years the Government has made significant changes to how the sector is regulated. More>>

ALSO:

WWF Report: Solutions In Reach; World Biodiversity Suffers Major Decline

Global wildlife populations have declined by more than half in just 40 years as measured in WWF's Living Planet Report 2014. Wildlife's continued decline highlights the need for sustainable solutions to heal the planet... More>>

ALSO:

Scoop Business: NZ Dollar Catches Breath After "Goldilocks" Slump

The New Zealand dollar edged up following its dramatic slump yesterday after the Reserve Bank confirmed speculation it intervened in the currency market last month and PM John Key suggested a “Goldilocks” level far lower than at present. More>>

ALSO:

Biosecurity: Kiwifruit Claim To Hold Officials Accountable For Psa

Kiwifruit growers have joined forces to hold Biosecurity NZ accountable in the courts for its negligence in allowing 2010’s Psa outbreak that devastated New Zealand’s kiwifruit industry and exports. Foundation claimants representing well ... More>>

ALSO:

Poison: Anglers Advised Not To Eat Trout In 1080 Areas

With the fishing season opening in just a few days (1 October 2014), anglers are being warned by the Department of Conservation(DOC) not to eat trout from pristine backcountry waters and their downstream catchments, where the department is conducting 1080 poisoning operations. More>>.

ALSO:

Get More From Scoop

 
 
Computer Power Plus

Standards New Zealand

Standards New Zealand

Mosh Social Media
 
 
 
 
 
 
 
 
Sci-Tech
Search Scoop  
 
 
Powered by Vodafone
NZ independent news