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Mosquitoes' sweet tooth targeted Mosquitoes' sweet tooth targeted
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Mosquitoes' thirst for sugar could prove to be the answer for eliminating malaria and other mosquito-transmitted diseases, say scientists.Mosquitoes' thirst for sugar could prove to be the answer for eliminating malaria and other mosquito-transmitted diseases, say scientists.
A Hebrew University team were able to devastate a local mosquito population by spraying acacia trees with a sugar solution spiked with an insecticide. A Hebrew University team was able to devastate a local mosquito population by spraying acacia trees with a sugar solution spiked with an insecticide.
While blood is the main element of a female mosquito's diet, they also like to feed on plant nectar between meals. While blood is the main element of a female mosquito's diet, it also likes to feed on plant nectar between meals.
The study features in the International Journal for Parasitology.The study features in the International Journal for Parasitology.
Malaria kills over a million people a year and is second only to tuberculosis in its impact on world health.Malaria kills over a million people a year and is second only to tuberculosis in its impact on world health.
It is spread by female mosquitoes who need a meal of blood before laying their eggs, but derive much of their persistent energy from nectar snacks, taken from flowers and nectaries on plant leaves and stems. It is spread by female mosquitoes which need a meal of blood before laying their eggs, but derive much of their persistent energy from nectar snacks, taken from flowers and nectaries on plant leaves and stems.
Isolated oasisIsolated oasis
MALARIA 300 million clinical cases each year1 million deaths world-wide per yearA child dies of malaria every 30 secondsBiggest number of deaths occur among young children in AfricaMALARIA 300 million clinical cases each year1 million deaths world-wide per yearA child dies of malaria every 30 secondsBiggest number of deaths occur among young children in Africa
The Israeli team sprayed acacia trees in an oasis in the southern desert region of the country with a sugar solution containing the insecticide Spinosad.The Israeli team sprayed acacia trees in an oasis in the southern desert region of the country with a sugar solution containing the insecticide Spinosad.
They chose the oasis because there were few other plants in the area from which mosquitoes could obtain their favourite tipple.They chose the oasis because there were few other plants in the area from which mosquitoes could obtain their favourite tipple.
It was also home to a distinct and isolated mosquito population, so the effect could be monitored closely with only a minor risk of mosquitoes from neighbouring areas contaminating the results.It was also home to a distinct and isolated mosquito population, so the effect could be monitored closely with only a minor risk of mosquitoes from neighbouring areas contaminating the results.
After spraying, almost the entire local population of mosquitoes was wiped out. The few mosquitoes that were trapped after spraying were thought to be newly emerging adults.After spraying, almost the entire local population of mosquitoes was wiped out. The few mosquitoes that were trapped after spraying were thought to be newly emerging adults.
Lead researcher Professor Yosef Schlein said planting mosquito-attracting trees or bushes in suitable habitats, and spraying them with oral insecticide, could provide a relatively easy and cheap way to tackle the problem of malaria.Lead researcher Professor Yosef Schlein said planting mosquito-attracting trees or bushes in suitable habitats, and spraying them with oral insecticide, could provide a relatively easy and cheap way to tackle the problem of malaria.
He said the technique had particular potential in areas of limited plant growth, such as desert and savannah regions, particularly sub-Saharan Africa, where malaria is becoming a bigger threat.He said the technique had particular potential in areas of limited plant growth, such as desert and savannah regions, particularly sub-Saharan Africa, where malaria is becoming a bigger threat.
It might also have some use in areas with a greater variety of flowers, as mosquitoes are very fussy, and only visit a limited number of species.It might also have some use in areas with a greater variety of flowers, as mosquitoes are very fussy, and only visit a limited number of species.
Spinosad is an environmental "reduced-risk" oral insecticide that has little effect on other insects, birds and mammals.Spinosad is an environmental "reduced-risk" oral insecticide that has little effect on other insects, birds and mammals.
Pierre Guillet, of the World Health Organization's global malaria programme, said any strategy that could effectively kill, or the reduce the life expectancy of adult female mosquitoes had potential as a way to control the spread of malaria. Pierre Guillet, of the World Health Organization's global malaria programme, said any strategy that could effectively kill, or the reduce the life expectancy of adult female mosquitoes, had potential as a way to control the spread of malaria.
However, he said the research would have to be replicated before any firm conclusions could be drawn.However, he said the research would have to be replicated before any firm conclusions could be drawn.