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When mosquitoes go resistant to pyrethroids, bendiocarb will cost more

February 3, 2013 - 12:27 -- William Jobin

Jim Webb's forthcoming book on the history of the fight against malaria in Africa is a plea for all of us..... (for me that includes WHO and USPMI folks)..... to learn from history, especially the history of these clever mosquitoes who quickly learn to overcome any synthetic biocide produced by the chemical industry. He cites the experience in Turkey, Pakistan and Sudan where the malaria programs went through 8 major classes of biocides after DDT lost its effect..........

Now the same thing is happening with the synthetic pyrethroids like permethrin and lamda cyhalothrin, and nobody seems to notice. So in some places they are blithely switching to bendiocarb, as if it will last too. It won't. And not only does the spraying of houses lose its punch, the treated bednets will also lose their flavor, and mosquitoes will hang around them until they find a small tear............

And if you do the cost calculations, bendiocarb is more expensive than the pyrethroids, which were more expensive than fenitrothion, which was more expensive than malathion, which was more expensive than DDT.............

So who wins? The industries which manufacture biocides and can convince WHO and PMI to continue making the same error. Who loses? Us....................

What is the solution? Develop non-chemical methods of mosquito control. Environmental, biological, screens, etc.......... Is anybody in Geneva or Washington listening?

Bill, with hope for a Green future of suppressing malaria in Africa...............


I am one of those who wish for Green future.
Great thanks for useful information and news on Malaria.
I have been reading Malaria World for several months.

It is known that some bacillus strains are used as biolarvicide, and we recently developed bacillus thuringiensis strain D142 from “Bacillus natto” discovered in Japan. Applying it as larvicide., we confirmed high larvicide efficacy in labo:test conducted on aedes aegypti, culture concentration at 0.1ppm, 0.5ppm, 1ppm, the death rate was about 33%/1h, 80-87%/3h, 100%/6h respectively.
Another product that we invented is to inhibit the growth of mosquito larvae.

In the environmental management for malaria elimination, I think harmony with the earth is a key.
For more information, contact at:
Yoko Murayama, PHILIA Co.,Ltd.

Submitted by lutgen pierre (not verified) on

Well said William.

DDT was replaced by more expensive insecticides when its price had fallen in 1970 and malaria had been eradicated by IRS in North America and Europe.
Africans were left alone with malaria, or had to use more expensive products.
The claim that resistance to DDT was building up is non-sense. DDT is not an insecticide but a repellent, and that property remains as strong as ever.DDT has no toxicity at all for humans, none, while pyrethroids and bendiocard are poisons for children, pregnant women ... But you can make a lot of money with these products selling them together with bednets. Billions.

Submitted by Niranjala (not verified) on

I agree with Sri Lanka mosquito resistants are reporting against pyrethroid bed nets which distributed in 2012.still we are testing them by bednet biio assay.