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Early in the morning of June 4, two twin-engine Beechcrafts lifted into the air on the Eastern Shore of Maryland.
Their goal: to head off swarms of Eastern Salt Marsh mosquitoes before they hatch. Their target: 200 acres of wetlands and salt marshes flooded by high tide and heavy rains. Their plan: to spray the area with a new larvicide, a pesticide targeted at the larval stage of insects, in hopes of reducing the potential population of adults, which bite fiercely and can carry diseasesincluding West Nile virusup to 20 miles away.
"These marshes in the Fishing Bay area are very productive," said Michael Cantwell, chief of mosquito control for Maryland's Department of Agriculture.
Fishing Bay is a small bay to the south and east of the Chesapeake. This year it produced what the department's chief entomologist was calling "a monster brood," with as many as a hundred larvae in a pint of water.
Once the floodwater recedes, larvae are left in isolated depressions that retain enough water to allow them to transform into adult mosquitoes over 7 to 14 daysdepending on the temperatureand swarm out of the marshes looking for a blood meal. That's the cycle Maryland mosquito control hoped to interrupt by using a very specific natural larvicide that has virtually no impact on other species.
Perennial Pests
Yes, it's that time of year again when whining mosquitoes zigzag and follow your breath until an annoying ritual takes place: They land, you swat, they die or fly away to lay eggs, you swell and itch.
Mosquito-control officials and other experts say it's almost impossible to forecast how good or bad a year will be in terms of mosquitoes. Too much depends on weather and timing.
While Maryland was targeting its monster brood, for instance, Texas mosquitoes have been mostly no-shows. Both are coastal states, which provide rich mosquito habitatTexas has the most varieties of any statethough the worst infested areas in the United States are the Florida Everglades and the Arctic National Wildlife Refuge in Alaska.
"We really haven't found very much this season," said Richard Duhrkopf, a biologist and mosquito researcher at Baylor University in Waco. "We had a very cold and very, very dry winter, so there were fewer adults around to get the population up and running. In Texas we're about a month behind."
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Hitting Mosquitoes Where It Hurts
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Newswise Researchers from North Carolina State University have developed a technique to control populations of the Australian sheep blowfly a major livestock pest in Australia and New Zealand by making female flies dependent upon a common antibiotic to survive.
Dr. Max Scott, professor of entomology at NC State, and his research team genetically modified lines of female Australian sheep blowflies (Lucilia cuprina) so that they required doses of tetracycline in order to live. Female blowflies that did not receive the antibiotic died in the late larval or pupal stages, before reaching adulthood. Several genetically modified lines lacking tetracycline showed 100 percent female deaths.
Scott says that the gene construct responsible for lethality in antibiotic-free diets is female-specific. Interestingly and unexpectedly, the genetically modified female larvae containing the tetracycline lethality genes also took on a crimson color due to overexpression of the linked red fluorescent protein marker gene. This allows scientists to tell which larvae will be females and which will be males.
Overexpression of the gene responsible for the reliance on tetracycline also seems to overexpress this marker gene, Scott says.
Since the females will die when not provided tetracycline in their diets, the males can be separated out in the larval stage. This is essential for a male-only genetic control program to reduce blowfly populations, Scott says, as fertile males would pass the lethality construct on to female offspring, which would die in the absence of tetracycline. Male larval offspring, however, would still be dangerous to livestock.
In the study, the researchers showed that the tetracycline gene construct also works in Drosophila, the fruit fly lab rat of the insect world that is a distant cousin of the sheep blowfly. This holds promise that the genetic system will function in the New World and Old World screwworm, two major livestock pests that are close relatives of the sheep blowfly. Scott is working with the U.S. Department of Agriculture to make male-only strains of the New World screwworm (Cochliomyia hominivorax).
The New World screwworm is a devastating pest of livestock that was eradicated from North and Central America by releasing sterilized male and female flies, Scott says. However, a male-only strain offers several advantages, including potentially more efficient population suppression for the ongoing program. Efficient genetic control systems have the potential to help eradicate some of the biggest problem pests across the globe, he said.
The research is funded by the U.S. Department of Agriculture, National Institute of Food and Agriculture and NC State.
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Researchers Develop Genetic Control Mechanism for Major Livestock Pest
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Could a cockroach survive a nuclear bomb?
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