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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
Heritage Garage Doors and Windows Video - San Jose, CA Unite
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patio doors fitting In Central London & North South West East London - Video
patio doors In Central London North South West East London
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patio doors replacement In Central London North South West East London
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patio doors replaced In Central London North South West East London
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patio doors replaced In Central London & North South West East London - Video
A.B.E. Doors & Windows marks its fourth decade
Forty years after founder Jim Lett started A.B.E. Doors & Windows, the former one-man business now employs 23 people and may soon be hiring at least two more.
The company celebrates four decades of operation this month and Lett says its future is promising.
"Today about 75 percent of our business is residential and the rest is commercial and industrial work," Lett said. "We sell and install windows; residential entry doors, storm doors, patio doors, garage doors and openers and we still do basement doors. A lot of today's newer homes are built to be cost-effective but after people are in a while, we find they often want to upgrade to improve the look and energy efficiency."
Lett is training his son, Jim Jr., as the heir to the business and takes pride in the approximately 17-year longevity rate for the majority of his employees. The key, he says, is to take pride in the work and give the customer an excellent product at a fair price.
Lett began his business less than a week after graduating from Bloomsburg University while he was still living with his parents. He had a separate phone line installed in his bedroom, his mother would take messages during the day and his father guided him with pricing and training.
"I had wanted to start a business but I didn't have anything in mind," he recalls. "My dad worked for Wolf Distributors and met the people from Gordon Cellar Doors at a trade show and that was the start of the whole thing. I went down to the newspaper office, took out an ad and I was up and running."
Lett would install basement doors during the day and return phone calls or do estimates at night.
One year after starting, he learned that Frantz Garage Doors on Race Street in Hanover Township, Lehigh County, was looking for someone to install garage doors, so he added that to his offerings and within a few more years, he had signed PermaDoor, one of the pioneers in the steel entry door market.
"Those first three products were really just a matter of taking advantage of opportunities that presented themselves," he said. "That was pretty much my business plan at that time."
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A.B.E. Windows celebrates four decades, and other company news
When I open my patio doors and breathe in the delicious scent of my neighbour's mock orange, with its pretty white flowers cascading conveniently over my garden fence, I know that summer is really here.
The delicious smell of this flowering shrub may only last a couple of weeks but for me it's one of the most memorable events of summer and there are varieties to suit most gardens, from the golden mock orange Philadelphus coronarius 'Aureus', which can be used to light up the back of a mixed border, to the more compact P. 'Manteau d'Hermine', which grows to just 75cm (30in), bearing masses of heady cream flowers and ideally planted next to a seating area in a sheltered spot where people can enjoy its scent to the full.
Of course, on the patio you are spoiled for choice with scented plants. Those which will grow happily in containers include night-scented stocks, clove-scented pinks and scented pelargoniums in the Fragrans Group, which have leaves with the aroma of lemon, orange and mint.
Herbs too will provide you with scent as well as flavour, including lemon verbena, Eau de Cologne mint (Mentha x piperita f. citrata), lemon thyme and fragrant rosemary. All these need to be touched to release their fragrance.
Sweet peas will also grow happily in a pot, trained up a wigwam, to give you not only fragrance but plenty of colour as well. Cut the flowers regularly and put a bunch on your patio table or even indoors if you want the scent inside as well. Cutting is essential with sweet peas if you want more flowers to appear throughout the season, as, if you don't cut them, the flowers will form bean-like pods, which send a message to the plant that flowering is over.
If you're after low-maintenance scent, pots of lavender will provide you with plenty of fragrance as well as attracting bees, and just need shearing to keep neat immediately after flowering. However, keep heavier scents such as lavender separate from other scented plants as otherwise it will dominate the group.
Plants whose scents will blend together beautifully in the border include lilies, phlox, sweet Williams, nicotiana (tobacco plant), sweet peas and nepeta (catmint).
For optimum fragrance, go for old-fashioned varieties of nicotiana, such as N. alata, which folds up its petals during the day and comes to life only at night. Modern dwarf varieties may look better but they don't have as much scent.
Similarly, I prefer old-fashioned roses which are in a bed, as I've never found that patio roses give as much scent-wise. Among my favourite roses for the border is the David Austin English shrub rose, Rosa 'Gertrude Jekyll', which bears stunning large, rosette-shaped pink flowers and has an outstanding perfume, as well as strong stems and a neat, compact shape with flowers produced throughout summer. It can be grown as a climber, reaching a height of around 8ft, and will do well combined with clematis.
Of course, there's also a plethora of scented climbers which are ideal for positioning near a door or pathway, or close to opening windows where their fragrance can be enjoyed from inside too.
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Heaven scent