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About Cottage Grove sentinel. (Cottage Grove, Or.) 1909-current | View Entire Issue (Oct. 28, 2015)
8A COTTAGE GROVE SENTINEL October 28, 2015 New insect pestering people and plants in Willamette Valley be reproducing on these plants. More likely the whitefl ies are moving on to them for winter protection. Comments and questions about the aggravating insect are trending on social media and lighting up the hotlines of Ex- tension’s Master Gardeners. “There are a lot of calls,” said Margaret Bayne, administrative specialist for the Master Gar- dener program in the Portland metro area. “We’re telling peo- ple not to worry and to wait for OSU and the Oregon Depart- ment of Agriculture to monitor it and make recommendations.” In addition to the large num- ber of whitefl ies fl oating around, people will begin to notice they secrete a substance similar to the honeydew produced by aphids. “It’s a sticky goo that can rain down on sidewalks and cars and be a real nuisance for people,” Rosetta said. “That will be what pushes people to ask about pes- ticides.” Chemicals won’t have much of an effect, however, because the plants get re-infested so quickly. “In one or two weeks it will look like you haven’t sprayed at all,” she said. “I don’t recom- mend spraying at this point. The plants like ash and ornamental pear where we’re seeing multi- ple life stages are all deciduous and the leaves will fall soon.” Until more monitoring is C louds of small white- winged insects fl ying around homes, gardens and even parking lots up and down the Willamette Valley have the pub- lic more than a little annoyed. “The ash whitefl y, which was fi rst detected last year, is becom- ing quite noticeable for most of us, particularly in the metro area, because they’re fl oating around in high numbers,” said Robin Rosetta, an entomologist with Oregon State University’s Extension Service. “Many are familiar with whitefl ies, but this is a new one. How impactful it will be is yet to be seen.” So far, limited plant damage has been detected in Oregon, according to Rosetta, though the ash whitefl y (Siphoninus phillyeae) can cause curled or stunted leaves and, in some cas- es, defoliation. The sap-sucking insect has a long list of plants it prefers. In California, where it showed up in 1988 and has largely disappeared due to an introduced parasitic wasp, there were about 40 host plants. In Oregon, they’ve been seen on Oregon ash, ornamental pear, hawthorn and fl owering quince. Other plants such as box- wood, barberry, rhododendrons and azaleas appear to attract the insect, but it doesn’t seem to done, recommendations are sparse. Using sticky traps may help, as well as raking up in- fested leaves. In California, the population of ash whitefl y declined by 99 percent within two years after the introduction of a parasitic wasp that is a natural predator, Rosetta said. She and offi cials at the Oregon Department of Agri- culture hope the wasp will show up in Oregon on its own, or that they can get regulations in place in the next two to three years to import the insect. “Bio-control is a pretty cool thing,” Rosetta said. “We have to be patient in the meantime. So sit tight.” Though other whitefl ies are common in Oregon, includ- ing the ubiquitous greenhouse type, the juvenile ash whitefl y is distinctive. The tiny eggs, which are laid on the under- side of leaves, are pale yellow Auto • Home • Life • Retirement PRACTICING THE ART OF TRANSMISSION REPAIR SINCE 1991 MAINTAINING YOUR VEHICLE AFFORDABLY (*'>8K<N8P9CM; :FKK8><>IFM< \i`bY\ejfe7XccjkXk\%Zfd WE LIVE IN THE SAME TOWN WE WORK IN “ NO MONKEY BUSINESS!” ERIK BENSON 541-942-2605 541-942-7672 Manual & Automatic Transmission Repair Tune ups 30-60-90K Services Brakes, belts, hoses and cooling system services Muffl ers & Custom Exhaust Drive-train repair such as clutches, u joints and differentials All makes and models. Call me today to discuss your options. Jfd\ g\fgc\ k_`eb 8ccjkXk\ fecp gifk\Zkj pfli ZXi%Kilk_`j#8ccjkXk\ZXeXcjfgifk\Zkpfli_fd\ fiXgXikd\ek#pfliYfXk#dfkfiZpZc\$\m\epfli i\k`i\d\ek Xe[ pfli c`]\% 8e[ k_\ dfi\ f] pfli nfic[ pfl glk `e >ff[ ?Xe[j# k_\ dfi\ pfl ZXejXm\% photo by Robin Rosetta Although the ash whitefl y showed up in Oregon in 2014, its population increased exponentially this year. e v i t o m Auto lties Specia Protect your world Patton’s Country Gardens and hatch into nymphs that are almost translucent at fi rst and then more opaque as they be- come covered in tufts of white wax, according to Rosetta. They develop into brown, egg-shaped young insects – called pupae – that can cause injury to the plant by sucking out its sap. As temperatures drop, the in- sects will become sluggish in their reproduction and activity and will largely disappear from sight with freezing weather. In spring, the whitefl ies start mul- tiplying more quickly and by late summer and fall numbers are high. 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