GENET archive


2-Plants: Bt potatoes to be released in New Zealand

genet-news mailing list

-------------------------------- GENET-news --------------------------------

TITLE:  Chemicals losing out to genetics
SOURCE: The New Zealand Herald, by Simon Collins
DATE:   Apr 20, 2003

------------------ archive: ------------------

Chemicals losing out to genetics 

Scientist Tony Conner hopes that McDonald's and Kentucky Fried Chicken made
a big mistake when they decided three years ago to stop buying genetically
modified potatoes.

As soon as he is allowed to after October, Conner plans to seek approval for
farm trials of potatoes containing two new genes taken from the bacteria
Bacillus thuringiensis (Bt) - the same bug that has been sprayed on West
Auckland to kill the Australian painted apple moth.

He's gambling that, unlike McDonald's and KFC, New Zealand potato farmers
will be keen to plant Bt-infected potatoes because they will be resistant to
another alien invader, the potato tuber moth.

"Bt cotton, maize and canola are available overseas," he says. "Bt potatoes
have been largely withdrawn from the US market because McDonald's said they
don't want genetically modified French fries, despite the fact that they
already use Bt soy oil in their salad dressings. KFC said the same."

The result is that New Zealand is now "as far ahead as anyone" with tuber
moth-resistant potatoes. Conner believes they will allow farmers to cut back on
the chemical sprays which control the moth at present.

Lincoln University Professor Alison Stewart, who heads a new bioprotection
technologies research centre which Conner has joined, says similar biological
controls - genetically modified or not - will increasingly replace chemicals
to control pests and diseases.

Non-chemical techniques hold enormous promise for all farmers, including
organic growers for whom "biological" controls mean acceptable "natural"

But genetically modifying plants to fight diseases is quite another matter.
Come October, when the present moratorium on genetically modified (GM) field
trials comes off, Conner's moth-resistant potatoes look like being the first
test of the new regime.

To those in China or India who see GM foods as their best hope to feed
growing populations, fighting pests and diseases might seem of marginal benefit.
Yet for New Zealand to help in feeding the world, and to protect our
environment, pests and diseases loom large.

The painted apple moth, which threatens our vast forest plantations, is just
one sign of our vulnerability.

Beekeepers are still struggling with the Varroa mite. A lettuce aphid has
forced farmers to abandon thousands of hectares of lettuces. A fungus, onion
white rot, threatens the viability of Pukekohe onion farms.

Larger pests endanger our livestock. Our possums carrying bovine
tuberculosis are up to 20 times more numerous on each hectare of land here than they are
in their native Australia, where predators keep them in check.

Stoats threaten to wipe out the kaka and our national symbol, the kiwi.

"Remaining populations of kaka around the country are just a shadow of what
they used to be and are showing 90 per cent-plus males, because the kaka nest
in the holes of trees where stoats eat the females," says Forest and Bird
conservation manager Eric Pyle.

"Predation of kiwi chicks by stoats is running at 95 per cent. Unless we
find better ways to control stoats, we are going to lose the last populations of
kiwi and kaka. We have a world-leading pest problem of a scale and dimension
that no other country has."

Controlling it is expensive. The painted apple moth campaign is costing $90
million. The Government spends $45 million on possum control and another $15
million on researching better methods to do the job.

In the last year for which figures are available, 1998, we slapped on 3300
tonnes of pesticides. More than 85 per cent of the world's 1080 poison, about
2.5 tonnes a year, is used in New Zealand to kill possums.

Many developed countries, including Australia, have adopted strategies to
reduce pesticide use. In Denmark, the Government set a target in 1996 of
halving pesticides in a decade, boosted research and appointed advisers to work
with farmers, funded by a tax on pesticides. The target was surpassed and they
are now cutting use even further.

In New Zealand, the last study found: "The gross quantities of pesticides
used in NZ annually have remained relatively constant with the totals in
1985-96 averaging 3700 tonnes [of] active ingredient per annum." The figures were
around 10 per cent less in 1983 and 1998.

"In this country people are scared to do anything that makes us look like we
are not clean and green," says Dr Meriel Watts of Pesticides Action Network.
"Actually we have a serious problem but we are in denial about it."

A year ago this week, the Ministry for the Environment launched a discussion
paper, Towards a Pesticides Risk Reduction Policy for New Zealand. This week
the ministry analyst in charge of the policy, Ian Cairns, said: "That work
has ceased. It's been overtaken by the hazardous substances strategy."

Amendments to the Hazardous Substances and New Organisms (Hasno) Act are due
in Parliament at the end of this month, mainly to provide for the conditions
under which GM organisms will be approved for field trials or release after
October. Pesticide provisions will now be tagged on.

"What it's shaping up to is there have been arguments from business about
Hasno creating excessive barriers to the registration of chemicals," Cairns
says. "The solution to that is to look at possible improved pathways through the
legislation ... It's going to make it easier ultimately in the next two to
three years to bring in new and more modern pesticides."

But while the politicians procrastinated, farmers have already started to
change. Over the past 10 years, driven by European Union requirements, the
kiwifruit industry has changed to the "KiwiGreen" system which has cut the
average number of across-the-board chemical sprays from eight a year to three.

"If they do require spraying, they use Bt," says Cathy McKenna of
HortResearch, Te Puke. Bt, being bacteria rather than a chemical, counts as
"biological" control and can be used even by the 5 per cent of kiwifruit orchardists who
have gone totally organic.

Her Hastings colleague, Dr Jim Walker, says apple growers have cut their use
of across-the-board chemical insecticides by 95 per cent since 1996, with
organic orchards now up to 9 per cent of the total. A Californian parasite,
Pmac, has been imported to attack the apple-eating mealy bug.

HortResearch has also hit on the ingenious idea of spreading female hormones
of moth pests through an orchard to confuse the male moths. In West
Auckland, to complement the aerial spraying, it has released 20,000 male painted
apple moths sterilised by irradiation. They are mating with the female moths who
do not know the males are sterile, so they are failing to breed.

"We are over-flooding the wild moths by a ratio of at least 80:1," says the
institute's biosecurity leader, Dr Max Suckling. "The trap catch was zero
last week, so the population has been seriously reduced. As the density gets
lower, the ratio of our sterile males increases."

Philip Manson, science manager of the Wine Growers' Association, says
vineyards have cut back on chemicals and switched to "greener" Bt. "Our slogan is,
'New Zealand wine, the riches of a clean, green land,"' he says. "In a
vineyard today you will see a lot more understorey plants that are there to provide
alternative food sources for the beneficial insects."

Professor Steve Wratten, another member of Stewart's National Centre for
Advanced Bio-Protection Technologies, has planted flowers between the vines at
Marlborough's Seresin Estate. Bugs that used to eat the grapes now feast on
pollen and nectar in the flowers instead.

Taranaki farmer Russell Jordan, who chairs the Vegetable Federation's fresh
vegetable sector, says vegetable growers are switching to Bt sprays such as
Dow Chemicals' 'Success'. "Organophosphates, which were like a shotgun that
blasted everything, were used because there was nothing else," he says. "But
public pressure is slowly starting to get them replaced."

He is less sure whether farmers will take up Conner's Bt-modified potatoes
or Crop and Food Research's other disease-resistant GM crops including onions,
peas and brassicas such as broccoli, cauliflower and Brussels sprouts.
"Growers may well be reluctant to use it [GM] because of consumer resistance, but
its acceptance will probably be pretty quick in other countries around the
world," he says.

Historically, biological methods have had some spectacular successes.
Ragwort and St John's wort were both classed among New Zealand's worst four weeds
early in the 20th century. Imported beetles have knocked them back to the
point where neither is now considered a problem.

Landcare Research expert Lynley Hayes says scientists have introduced six
new bugs since 1989 to replace chemical sprays for gorse, with only limited
success so far.

Landcare is about to apply to the Environmental Risk Management Authority
(Erma) to bring in a South African leaf roller caterpillar to attack a yellow
daisy-like weed called bone-seed.

Another crown institute, AgResearch, has brought in tiny wasps from Europe
and South America to attack grass-eaters such as the clover root weevil and
the Argentine stem weevil.

Its biocontrol science leader, Dr Stephen Goldson, is working with the
British Army to adapt a military sensor to look for unwanted bugs coming over the

Landcare, AgResearch and Australian scientists are all working on various
biological methods to control possums. Landcare has brought in carrots that
have been genetically modified in the US to make possums infertile when they eat

AgResearch is trying to genetically modify a worm in the possums' bodies to
produce a protein that will damage their growth, life or reproduction. "We
have worked out the genetic techniques to modify it," says its science general
manager, Dr Paul Atkinson. "What we don't have is certainty that the public
would accept that. It will be five or 10 years before we would be ready to
deploy it."

In the Green camp, Watts welcomes most of the thrust towards biological
controls - but not modifying plants genetically to resist disease. She points to
a US study showing that genes inserted into crops to make them resistant to
Monsanto's Roundup weedkiller have spread into 200 weed species.

"They have had to return to weedkillers that are a lot more damaging than
Roundup was, such as Paraquat," she warns.

However, cabinet papers published on Thursday argue that such risks can be
limited by setting conditions on GM crop releases, such as specifying where
they can be planted and how far away they must be from non-GM crops.

Conner and Stewart both see GM crops as only part of integrated pest

Their new centre, though based at Lincoln University, includes scientists
from four other universities and six research institutes.

The Government is giving it $2.7 million a year for the next six years, plus
money to buy equipment and build a $3.5 million climate-controlled
greenhouse or "biotron" at Lincoln.

"We have been working in silos for 10 years on different developments. The
aim is to break down all those barriers, from organics to high-tech
biotechnology," says Stewart.

"The philosophy is, let's understand more about the underlying molecular
basis of how pests and diseases cause damage, and see if we can come up with
innovative ways of the plant being able to suppress them.

"Some may be transgenic crops. Or it might be another idea that involves no
GM technology at all."



Hartmut Meyer       to contact me from Apr 22 - Apr 27
Kleine Wiese 6       please use:

+++ GMX - Mail, Messaging & more +++
Bitte lächeln! Fotogalerie online mit GMX ohne eigene Homepage!