> The cited paper really stretches the facts in a lot of places. For
> example, it cites the action of neonics on termite susceptibility to
> fungi, but the authors apparently never read the original
> research--the neonics simply slowed their grooming of fungus spores
> from their skin. There was no immune suppression per say.
Maybe, but the article of cedric alaux shows a reduction in the activity of glucose oxidase (responsible for the sterilization of brood and food) and synergy with the opportunistic parasite nosema
> The authors refer to a study that showed neonic immune suppression in rates.
> In actuality, the paper states "Our results revealed that in 200 mg/kg
> body treated rats, there were significant decrease in mean values of
> total leukocyte count and relative lymphocyte count in rats." But
> look at the dosage! 200 mg/kg = 200,000 ppb dose to the entire rat body weight!
> This is far more than the typical 2-4 ppb exposure in pollen or
> nectar, so it is a stretch of the mind to consider it to be relevant.
Randy, don't you confuse a dose and a concentration?
Giving 200mg to 1 kg of rat is in fact giving 1-20ng to a bee (100mg) and if you look at the LD50 20ng/bee we have 90% mortality ... it is in the correct range of study
> The paper states that "The phenomena of insect and herbicide
> resistance have locked US farmers into a pesticide treadmill." This
> is certainly true, but has little to do with their hypothesis.
this is not an argument but a position against an intensive system that pushes farmers into a vicious circle .... The same applies when the authors speak bitterly of the prophylactic use (treated before the disease) rather than reactive (treated when the plant is sick).
>
> Then they make statements like: "The consequences of this novel mode
> of insecticidal action are that insects die in droves, not only at the
> time of application, but also weeks later due to chronic toxicity."
> But they say this with no supporting data, or even a reference!
hmmmm, should we really read again the studies on chronic toxicity?
> If you are interested, also refer to Suchail, S, et al (2004) In vivo
> distribution and metabolisation of 14C-imidacloprid in different
> compartments of Apis mellifera L. Pest Manag Sci 60(11):1056-62. She
> fed C14-labeled imidacloprid to honey bees and measured the amount of
> residual
> C14 over time. It quickly disappeared from the bees even in the
> absence of defecation, implying that it was broken down into CO2 and exhaled!
gloups, so you can use any toxic, it can be detoxified ... a little bit short as argumentation, don't forget that pesticides fields are mixed with substances that block detoxification with the effect that 1 +1 = 10 .
Kind regards,
Ghislain De Roeck,
Belgium.
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