Showing posts sorted by relevance for query pest management. Sort by date Show all posts
Showing posts sorted by relevance for query pest management. Sort by date Show all posts

Monday, May 17, 2010

Chinese GM Cotton increases Fruit Pest

I imagine there will be some hoopla over this new Science article, so here's the cliff notes version:




  1. Cotton bollworm was a serious pest in China and was controlled with pesticide sprays
  2. Transgenic Bt cotton was introduced as a better management strategy for bollworm
  3. In the absence of regular sprays, a minor pest (the mirid bug) has become a real problem
This isn't a genetic engineering story - it's an integrated pest management story.

Kudos to the Chinese ag scientists for being on top of this! I hope they can come up with some cheap and safe solutions for their farmers.

Monday, August 24, 2009

Corn v. Western Corn Root Worm

A group in Germany has recently used genetic engineering to integrate an ecologically-based pest resistance into corn.

They cut the gene for (E)-beta-caryophyllene synthase out of an oregano plant and pasted it into a corn plant. This allowed the corn to produce (E)-beta-caryophyllene, a volatile scent chemical. This chemical has been shown to attract insect-eating entomopathogenic nematodes, which arrive to feed on an important corn root pest, the western corn root worm. Fighting pests with their natural enemies is a tactic known as biological control. Biological control is one of the key components of IPM (integrated pest management), an ecological-based strategy that aims to reduce pests to an economically-acceptable level, as opposed to scorched-earth eradication.

The really neat part of this story is that old varieties of corn made this chemical naturally - and European varieties still do. It's a natural consequence of plant breeding that you only keep traits you value very highly (and can detect!). If you grew your breeding lines in a field without adequate populations of both the insect and the nematode, you'd have no way of knowing that some of your plants contained a resistance trait.

A similar story shaped the modern rose. In the Middle Ages, roses were largely appreciated for their scent, but as generations of plant breeders created bigger and more colorful flowers, the genes for scent were lost. A few laboratory groups are now working on restoring the rose's scent through genetic engineering approaches similar to the above.

It would take years to move this natural corn gene back into North American varieties with traditional breeding techniques. The same thing could be done in a few months with genetic engineering techniques, but would probably require years and millions of dollars worth of regulatory tests. Either way, I hope it happens. I'm a big fan of technologies that encourage farmers to tend to the ecological integrity of their farms. Biological control doesn't do any good if you kill all the good bugs.

Degenhardt et al. 2009. Restoring a maize root signal that attracts insect-killing nematodes to control a major pest. PNAS August 3.

Wednesday, February 10, 2010

Canada Bans Weed and Feed


"Pesticides should only be used when and where there is a need...

...fertilizer-pesticide combination products for lawn and turf uses do not support the goals of best practices for pest management in turf..." - Health Canada
I imagine this will discourage indiscriminate dumping of unnecessary chemicals onto lawns. Now if we could just get rid of lawns...

h/t: The Clueless Gardeners


* I love best agronomic practices!
**My dad's been using corn gluten on our old acre lot and swears by it for weed suppression. We never had any pest problems - maybe because there was such a huge amount of habitat for predators. We did once have serious infestation of yellow jackets in the front yard - but some gasoline and fire took care of them!

Friday, August 20, 2010

Evolving Pesticide Resistance

It's been estimated that genetic resistance to every pesticide that will ever be invented already exists in some microbe in some field, somewhere in the world (simply because there are so many individuals of each species). If you invent an incredible new spray that kills, say, Phytophthora infestans, you'd know that somewhere in the world there is a little P. infestans mycelium or spore that is already resistant. If you start spraying thousands and thousands of acres with your new pesticide, you may have a season or a few without late blight, but it's only a matter of time before this little guy gets into your field and finds a smorgasbord all for himself.

Wednesday, March 3, 2010

"We are as gods and HAVE to get good at it"

Stewart Brand, a founding member of the environmental movement, has a new book: Whole Earth Discipline: an ecopragmatist manifesto

It's a pretty provocative book. Brand seizes Green sacred cows and re-imagines our relationship with the Earth as active gardeners, not trespassing invaders. It's a welcome, positive change of perspective, heavily footnoted.* Here are some of his assertions:

Global warming is a bigger paradigm-shifting catastrophe than you realize. It will change everything.

Humans have been engineering the climate on a large scale for 10,000 years - early agriculture and fuel burning may have averted an ice age.

Rural life shouldn't be worshiped by Greens - dense cities are much more efficient, and therefore less damaging to the environment.

Slums in the developing world are vibrant communities that provide families with an invaluable stepping stone from hopeless rural poverty to economic self-sustenance. Slums shouldn't be bulldozed and replaced with subsidized housing - they should be encouraged to develop naturally and integrated into the legitimate political and economic networks of their adjoining cities.

Massive movement of peasants to urban areas has improved their lives, improved the lives of the few who remain to work the fields and now the rainforests are growing back faster than they are being cut down.

Our current population crisis is that the birth rate is TOO LOW
Most of the developing world has a rapidly aging population which will soon have too few productive workers to support it. The U.S. is an exception due to immigration, but this will end as immigration slows due to plummeting birth rates in developing countries like China and India. By 2050 Mexico will be grayer than the U.S.

Increasing urbanization of the U.S. is emptying out huge regions of the continent - the Great Plains from Montana to Texas may soon form the Buffalo Commons once envisioned.

Nuclear power is our ONLY hope for Green energy (and isn't as scary as people think).

Very few people were harmed in the Chernobyl meltdown and the contaminated land has now become an involuntary natural park full of (healthy) rare and endangered animals.

Stress from fear of nuclear contamination has literally harmed people more than actual radiation has - even (or especially) in the Chernobyl region.

Nuclear waste storage is not nearly as difficult as you think it is - if you used nuclear electricity for 80 years, your personal share of waste would be a ceramic-like solid the size of a soda can.

He also references an AWESOME video of Sandia National Lab engineers demonstrating the integrity of their nuclear waste containers by (failing) to smash them with crashing 18 wheelers and trains. Oh, and they propel these vehicles into each other with rockets (minute 4)...

My brother pointed out that the plentiful mustaches and Members Only jackets suggest that these containers are probably even stronger today.

North America was not "wild" when Columbus showed up - it was heavily managed by the American Indians - and we shouldn't hesitate to garden the planet.

40% of Eastern forest trees when Columbus arrived were chestnut - but these trees only occupied 7% before the American Indians' influence. Passenger pigeons only produced giant flocks due to this type of management.

Golden California hillsides are made up of invasive annual grasses - and were originally covered by perennial species. Oats, introduced by Spanish colonists in the south of the state had migrated north and were being eaten by the local Indians before the colonists got there.

Ecological communities aren't sacred assemblages - they're made up of organisms that are slowly migrating past each other as the climate constantly changes.

Planting pest-free plants in our gardens lowers insect populations and therefore removes food sources for birds. Predator-free deer herds destroy the understory, and therefore habitat and food for birds and small mammals. The presence of coyotes limits small animal kills of domesticated cats. The reintroduction of wolves to Yellowstone stopped elk from consuming all the seedlings, which allowed beavers to dam rivers and create wetlands. Harsh herbicides are sometimes the only way to deal with invasive plants. Zebra mussels reversed eutrophication of the Great Lakes and provided a strong base for a renewed food web that supports rare fish and wetlands. We should farm the oceans instead of hunting them...

Nature is a complicated thing. We should objectively and pragmatically pursue whatever methods generate and preserve biodiversity and charismatic organisms and ecosystems.



*I didn't bother to look up any of his sources but I'd be interested to hear if you do.
**Much of this is available as TED talks.

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