cheapbag214s
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 Posted: Fri 15:59, 30 Aug 2013 Post subject: borers in St-spun2 |
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borers in St
The emerald ash borer was reunited Wednesday with an old nemesis in the homeland included in Minnesota's tries to impede the tree killer,[link widoczny dla zalogowanych].
State Department of Agriculture scientists released nearly 2,500 stingless Chinese wasps onto infested ash trees in Langford Park in St. Paul's St. Anthony Park neighborhood. More releases are planned at four sites in Minneapolis over the summer.
The gnat-size wasps are the natural predator to the ash borer within their native Asia. Here,[link widoczny dla zalogowanych], scientists call the wasps a "biocontrol agent." A large number of them will be let loose on trees come july 1st.
Monika Chandler,[link widoczny dla zalogowanych], biological control program coordinator, said since the state didn't have to pay for the wasps,[link widoczny dla zalogowanych], the price is minimal. "They work for free," she said from the wasps. "Once you get your bugs available, they're self-sustaining."
In contrast,[link widoczny dla zalogowanych], department spokeswoman Liz Erickson said,[link widoczny dla zalogowanych], the cost to reduce or treat infected trees in the Twin Cities could be a minimum of $1.5 billion from 2009 to 2015.
Chandler said the wasps were studied extensively to ensure their release wouldn't create an unintended deleterious effect of their own,[link widoczny dla zalogowanych]. But scientists will require many years of results and focus before they can determine whether the wasps save trees.
In China,[link widoczny dla zalogowanych], the wasps have been in a position to kill from 30 percent to 90 % of ash borer larvae each year.
Other control methods, for example preemptive elimination of trees and treatment,[link widoczny dla zalogowanych], will still be used. "It's something we aren't likely to eliminate,[link widoczny dla zalogowanych], unfortunately,[link widoczny dla zalogowanych]," said Geir Friisoe, director from the plant protection division in the Agriculture Department.
Minnesota is releasing three species of wasps that either attack the borer in the larval stage under the bark or reach eggs in bark crevices.
Given their petite size and lack of stingers,[link widoczny dla zalogowanych], the wasps aren't likely to harm humans or even the environment, according to the department.
"Millions of biocontrol agents happen to be released,[link widoczny dla zalogowanych], and we've had no problems whatsoever," Chandler said, referring to containment of other invasive species.
Moments before the initial wasp release Wednesday,[link widoczny dla zalogowanych], Chandler stood aside a sprawling,[link widoczny dla zalogowanych], billowy ash. The tree won't make it, Chandler said,[link widoczny dla zalogowanych], and can fall,[link widoczny dla zalogowanych], be stripped and studied for ash borer and wasp penetration.
Since the metallic green ash beetle was accidentally introduced into the Usa,[link widoczny dla zalogowanych], it has killed millions of trees in 15 states. The borer larvae kill by tunneling into ash trees,[link widoczny dla zalogowanych], then feeding on and disrupting the flow of nutrients. They leave tell-tale one-eighth inch D-shaped exit wounds in the bark and serpentine tunnels underneath it. The borers are active from May to September.
Minneapolis plans to release wasps at Tower Hill Park, two sites about the East River Parkway and something along West River Parkway.
The wasps come from a farm in Brighton,[link widoczny dla zalogowanych], Mich., where the state has released wasps to quash an infestation there.
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