Althaea hirsuta



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Overwintered Honey Bee Nucleus Colonies: Big Solutions in Small Packages


1 Beekeepers lose colonies every year. This reduces pollination income and honey production and increases the cost of re-establishing lost colonies. Beekeepers can minimize lost colonies by using good management practices; however, one important practice is to establish nucleus colonies (nucs) during the active bee foraging season. Overwintered nucs provide quick resolution for many beekeeping problems, are available when mated queens and bee packages are not commercially available, and can provide a valuable source of revenue. With proper use, nucs can help mitigate colony losses...

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Large Raspberry Aphid


1 Large Raspberry Aphid Amphorophora agathonica D. Lightle and J. Lee PNW 648 • August 2013 A Pacific Northwest Extension Publication Oregon State University • University of Idaho • Washington State University The large raspberry aphid, Amphorophora agathonica, is native to North America. It can be found throughout the northern United States and Canada on cultivated red raspberry and black raspberry, and on a variety of native Rubus species such as thimbleberry and salmonberry. It is not known to colonize commercial blackberries. Large raspberry aphid is notable as a...

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Predicting and Managing Gray Mold Rot of Pear in Oregon


1 Robert A. Spotts, professor emeritus, Mid-Columbia Agricultural Research and Extension Center, Oregon State University, Hood River, Oregon. Steve Castagnoli, Extension horticulturist, Hood River County Extension, Oregon State University, Hood River, Oregon. Predicting and managing gray mold rot of pear in Oregon Robert A. Spotts and Steve Castagnoli EM 9001 • Januar y 2010 Gray mold, one of the most serious decay problems for pear fruit in the Pacific Northwest, is estimated to cause about $6 million in losses to the pear industry each year due to fruit rot in storage. These...

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Are Your Weed control Products Damaging Nearby Vineyards?


1 Grapes are becoming an increasingly important crop in Oregon. There are more than 22,000 acres of vineyard planted in the state, from the Willamette Valley south to Medford and Ashland, along the Columbia Gorge, and into the Milton-Freewater area. There is also a small but growing interest in counties of Central Oregon. The farm gate value (the price of grapes when sold by the farm) is nearly $130 million annually, making grape production a significant agricultural commodity in the state. Over the past decade, grape growers have become increasingly concerned that herbicides used...

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Invasive Weeds in Forestland: Himalayan & Evergreen Blackberry


Invasive Weeds in Forest Land Himalayan Blackberry Rubus armeniacus (discolor) Evergreen Blackberry Rubus lacinatus EC 1594-E • September 2008 Himalayan blackberry, also known as Armenian blackberry, is a widespread invasive species in western Oregon and also grows in some eastern Oregon ripar- ian zones (Figure 5, next page). Commonly found in riparian areas, it also grows along roadsides and fence corridors and in open woodlands, logged areas, and other disturbed sites. It grows best on deep, fertile soils but can colonize a wide variety of sites if soil moisture is...

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Invasive Weeds in Forestland: Knotweeds


Invasive Weeds in Forest Land Knotweeds Polygonum spp. EC 1597-E • September 2008 Japanese knotweed Polygonum cuspidatum Giant knotweed Polygonum sachalinense Japanese–Giant knotweed hybrid Polygonum x Bohemicum Japanese and giant knotweeds were introduced to North America in the late 1800s as ornamentals but soon escaped into the wild. They are particularly invasive along streams, roadsides, and waste areas. Large, spreading patches of knotweed can completely dominate and displace native species in open sunlight. Erosion can increase on riverbanks or floodplains...

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Group Selection Cutting in Mature Douglas fir Forests


EM 9106 December 2014 Group Selection Cutting in Mature Douglas-fir Forests Tristan Huff matrix— In a group selection harvest system, the mature, retained portions of a stand. Group selection is a way to partially emulate older forest structure while still allowing for significant timber production. Under this silvicultural method, the forest is regenerated by cutting small patches within the matrix of the mature forest (Figure 1). This management style mimics the natural gap creation that takes place in old-growth stands as a result of windthrow, landslides, and root-rot...

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