Sheep Grazing Spotted Knapweed and Idaho Fescue

Long-term grazing effects on genetic variation in Idaho fescue

The effect of cattle grazing on the genetic structure of native grass populations has received little attention. We investigated the effect of cattle grazing on genetic variation in Idaho fescue (Festuca idahoensis Elmer) using ISSR (inter-simple sequence repeat) DNA markers. The ISSR markers are hypervariable and are generally interpreted as being selectively neutral. Idaho fescue tillers were...

Effects of Moisture and Temperature on Germination of Idaho Fescue

Germination response to varying temperatures and water stress levels during a 30-day incubation period was observed in 4 eastern Oregon collections of Festuca iduhoensis Elmer. Seeds were selected from the following habitat types: Artemisia trident&a ssp. wyomingensis/Festuca iduhoensis (ARTRV/FEID), Pinus ponderosa Dougl./Festucu idahoensis (PIPO/FEID). One stand of each habitat type was sampl...

Comparisons of Cattle Grazing and Sheep Grazing

Controversy has surrounded the possible differences in pasture production which result from grazing by cattle or sheep. Experiments conducted over the 1972-76 period show that pasture production under grazing by sheep is greater than under grazing by cattle under similar intensive managements. A change from sheep grazing to cattle grazing can cause a rapid deterioration in pasture production, w...

Idaho Private Rangeland Grazing—Lease Arrangements

Fungal endophytes in spotted knapweed influence its competitive interactions

Fungal endophytes in spotted knapweed influence its competitive interactions. Abstract Fungal symbionts are often overlooked in studies of plant invasion. Nevertheless, their role could be essential to the competitive success of the invader. We studied fungal endophytes in the widespread invasive Centaurea stoebe (common knapweed). A preliminary experiment showed that endophytes in roots of C. ...