Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


Giant willow aphid found in Hawke’s Bay

Giant willow aphid found in Hawke’s Bay


Hawke’s Bay Regional Council is monitoring the spread of the Giant willow aphid after the insects were recently discovered on willows by most of our rivers.

“We are starting to find the Giant Willow Aphid, and getting reports of it being in a few locations so this bug is definitely in Hawke’s Bay. So far, it seems that not a lot is known about the insect, or just how badly it could affect the willows long term,” says Mike Adye, HBRC’s Group Manager Asset Management.

This aphid was first detected in New Zealand in December last year. Since its discovery the insect has been reported from Northland, Auckland, Bay of Plenty, Taranaki, Gisborne, Hawke’s Bay, Wairarapa and Tasman District.

Plant & Food Research and the Ministry of Primary Industries provided information to HBRC on the aphid, and HBRC Works Group staff went looking for signs of the insect along the rivers. HBRC is also getting more reports from members of the public.

Mr Adye says that the damage is currently only on a few individual trees but the insect has been found at most Hawke’s Bay rivers.

“This could potentially be another threat to our willow edge protection zones, so we will be taking a very keen interest in any new information released and particularly any control methods that may be available.”

From 2005 HBRC battled Willow sawfly, an insect which defoliated many of the willows used for flood protection alongside stretches of Hawke’s Bay rivers. HBRC spent $9M on remedial action to keep the flood protection up to a high level. New tree species were planted to withstand further sawfly infestations and to help protect the stopbanks. Trees planted to replace willows devastated by willow sawfly are now well established and the river protection is back to where it was before the pest devastated the willows.

Background information attached but in summary:

Tuberolachnus salignus (Giant willow aphid) is a very large aphid with a body length of 5.0-5.8 mm. Wingless individuals (Apterae) are mid-brown to dark brown with several rows of black sclerotic patches. The early season colonies appear in summer and are situated at the base of the willow trees, moving up the stems with increasing numbers. In summer, colonies formed by individuals dispersing from other infestations start higher on the stem, some up to 3.5 m from the ground. By late summer colonies can contain tens of thousands of individuals. Colonies persist through the autumn and although they decline in late autumn, they continue to feed on the stems after leaf fall and into winter.


Hawke’s Bay Regional Council is monitoring the spread of the Giant willow aphid after the insects were recently discovered on willows by most of our rivers.

“We are starting to find the Giant Willow Aphid, and getting reports of it being in a few locations so this bug is definitely in Hawke’s Bay. So far, it seems that not a lot is known about the insect, or just how badly it could affect the willows long term,” says Mike Adye, HBRC’s Group Manager Asset Management.

This aphid was first detected in New Zealand in December last year. Since its discovery the insect has been reported from Northland, Auckland, Bay of Plenty, Taranaki, Gisborne, Hawke’s Bay, Wairarapa and Tasman District.

Plant & Food Research and the Ministry of Primary Industries provided information to HBRC on the aphid, and HBRC Works Group staff went looking for signs of the insect along the rivers. HBRC is also getting more reports from members of the public.

Mr Adye says that the damage is currently only on a few individual trees but the insect has been found at most Hawke’s Bay rivers.

“This could potentially be another threat to our willow edge protection zones, so we will be taking a very keen interest in any new information released and particularly any control methods that may be available.”

From 2005 HBRC battled Willow sawfly, an insect which defoliated many of the willows used for flood protection alongside stretches of Hawke’s Bay rivers. HBRC spent $9M on remedial action to keep the flood protection up to a high level. New tree species were planted to withstand further sawfly infestations and to help protect the stopbanks. Trees planted to replace willows devastated by willow sawfly are now well established and the river protection is back to where it was before the pest devastated the willows.


Tuberolachnus salignus (Giant willow aphid) is a very large aphid with a body length of 5.0-5.8 mm. Wingless individuals (Apterae) are mid-brown to dark brown with several rows of black sclerotic patches. The early season colonies appear in summer and are situated at the base of the willow trees, moving up the stems with increasing numbers. In summer, colonies formed by individuals dispersing from other infestations start higher on the stem, some up to 3.5 m from the ground. By late summer colonies can contain tens of thousands of individuals. Colonies persist through the autumn and although they decline in late autumn, they continue to feed on the stems after leaf fall and into winter.
ends

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Scoop Editor "Ask me anything" : Scoop's 'Invisible Paywall'

Operation Chrysalis: The Final Countdown - Thanks & There's Still Time To Pledge

Phew! We are now counting down the hours to the end of this crowd-funding campaign at 11pm on Sunday. Thankyou to all those Scoop readers and supporters who have pledged already. You have been awesome. But this is not over yet. More>>

 
 

PARLIAMENT TODAY:

IPCA Reports: Significant Problems In Police Custody

In releasing two reports today, the Independent Police Conduct Authority has highlighted a number of significant problems with the way in which Police deal with people who are detained in Police cells. More>>

ALSO:

Inspector-General of Intelligence and Security: Inquiry Into GCSB Pacific Allegations

The complaints follow recent public allegations about GCSB activities. The complaints, and these public allegations, raise wider questions regarding the collection, retention and sharing of communications data. More>>

ALSO:

TPPA Investment Leak: "NZ Surrender To US" On Corporates Suing Governments

Professor Jane Kelsey: ‘As anticipated, the deal gives foreign investors from the TPPA countries special rights, and the power to sue the government in private offshore tribunals for massive damages if new laws, or even court decisions, significantly affected their bottom line’. More>>

ALSO:

Werewolf: The Myth Of Steven Joyce

Gordon Campbell: The myth of competence that’s been woven around Steven Joyce – the Key government’s “Minister of Everything” and “Mr Fixit” – has been disseminated from high-rises to hamlets, across the country... More>>

ALSO:

RMTU: No Public Submissions On International Government Procurement Deal

“The government is preparing to assent to the Government Procurement Agreement, a World Trade Organisation Treaty which opens up New Zealand Government contracts to foreign companies and closes the door on local businesses and their workers. However the Foreign Affairs, Defence and Trade Select Committee is refusing to take public submissions on the decision.” More>>

ALSO:

Gordon Campbell:
On Pacific Spying

So New Zealand spied on its friends and allies in the Pacific – and has not only been passing on the results to the NSA, but has apparently passed on the details of the Pacific’s relations with Taiwan to our other best friends, the Chinese. On the side, the Key government has also been using the security services to gauge the chances of Trade Minister Tim Groser landing the top job at the WTO... More>>

ALSO:

State Housing Transfer: Salvation Army Opts Out

The Salvation Army has decided against negotiating with Government for the transfer of Housing New Zealand stock.
More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news