OXITEC sort du moustique !....
mardi 4 février 2020 -
OXITEC : Cette société fait encore parler d’elle il faut savoir que SNP est entré en contact avec cette firme de pointe en octobre 2012 dans le cadre de ce qu’on appelait à l’époque la lutte autocide ( aujourd’hui lutte TIS). Il aurait s’agit de mettre au point CRP génétiquement modifié. ..... pas très à la mode à ce moment-là en tout cas. C’est encore aujourd’hui le cas même sur certains affections extrêmement graves exemple le ZIKA on sent bien le discours officiel moins assuré.
Il s’agit ici d’un lépidoptère comme notre Paysandisia Archon qui pourrait être combattu de la même façon, d’autant que le programme Semiotrap qui est en phase de débriefing n’a pas permis de dégager d’autres moyens de lutte par utilisation de phéromones.
Diamondback moths are major crop pests around the world.
Genetically modified male diamondback moths designed to wipe out pest populations have been released in New York state. The field trial shows that these GM moths, whose female offspring die soon after hatching, could help control this major crop pest.
Oxitec, the British biotechnology company behind the trial, has already carried ou field trials of this method for controlling mosquitoes that spread diseases such as dengue. However, the moth field trial is the first for a crop pest, the company says
The larvae of the diamondback moth (Plutella xylostella) eat the leaves of brassic plants such as cabbage, kale, broccoli and oilseed rape (canola). The moths are a major pest worldwide, causing damage estimated at $5 billion a year.
To create its GM moths, Oxitec added two genes to moths that are still suscepti124 to pesticides. One gene simply codes for a red fluorescent protein, so the insects can easily be identified in the wild.
The other gene kills larvae soon after they hatch - but it switches on only in females. When male GM moths mate with wild females, all the female offspring die, but the males survive and pass the lethal gene on to their offspring.
Because half the offspring of the GM males die each generation, the lethal gene
should disappear after just a few generations. To continue to suppress wild
populations, more GM males would need to be released.
Read more : Modified maize that kills with RNA is given go-ahead in the U5
In field trials in August and September 2017 at the Cornell University Agricultural
Experiment Station in New York, between 1000 and 2500 males were released on
six separate occasions. The researchers then recaptured some of the moths to
confirm that they survived in the wild. They say the moths should be as
competitive with wild male moths in mating with females as they were in lab trial !
done in the US and UK.
As expected, the GM strain didn’t persist in the wild. "We did not detect any of
them hanging around," says Neil Morrison of Oxitec.
The company hopes to get approval to start selling its GM diamondback moths to
farmers in the US. It also plans to use the same technology to tackle other crop
pests, such as the fall armyworm.