> Scientists now believe most mosquitoes may have regained a 
> susceptibility to malathion. The reason, they say, is that it is
> difficult for a mosquito to block more than one type of pesticide.
> The trick is to try to nurture this susceptibility and breed the 
> vulnerability to at least one type of pesticide back into the
> population.
> So next year, in Harris County, Parsons said he has recommended 
> that the county rotate among spraying with malathion and two
> different types of pyrethrins. This targeted spraying should 
> extend the useful lifetimes of the chemicals.
> Scientists say an unfortunate byproduct of all spraying is that 
> the chemicals will eventually only kill those mosquitoes that have
> no resistance at all. With no reproduction from this desirable 
> group, then, it will become increasingly difficult to breed
> susceptibility back into the population. 
> "It's pretty well proven that dead mosquitoes can't reproduce," 
> Olson said. "That's an Aggie paradigm right there."

JE:-
In the end selective forces have to
become mutualised. Because it suits us
not to have any mosquitos around at all 
does not mean that it suits nature. 
The more we attempt to remake nature
just to suit ourselves the more nature fights
back on behalf of non mutualised species.
Like all wars, such a fight is not worth the 
cost. Slowly but surely we are learning that
we are only one part of an mutualised ecosystem 
that requires the Darwinian total fitness of every 
selectee within it to be selected to increase
and not decrease. We should expect more and 
more invasions of excessive human populations 
with deadly infections like AIDS viruses as we
make ecological war on nature forcing an absolute
fitness loss on unwanted species that are selected
to hit back. 

Regards,

John Edser
Independent Researcher

PO Box 266
Church Pt
NSW 2105
Australia

edser{at}tpg.com.au
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