No-till pasture renovation can increase the quality and forage yield of underproductive pastures. Decreased erosion, lower costs, and less lost grazing time are advantages of no-till renovation compared to conventional renovation. Unwanted vegetation is first controlled with herbicides to decrease competition for introduced orchardgrass. Two field trials were conducted using...
Invasive plants have the capacity to transform landscapes and alter ecosystem function, causing significant economic and ecological damage. These effects include displacement and reduction of native flora and fauna, altered fire regimes, modification of biotic and abiotic soil properties, as well as local, regional, and global economic impacts. With such...
There is growing interest in using nutrient manipulations to control invasive
plants such as Brornus lectorurn L. (cheatgrass). Both labile (sucrose) and recalcitrant
(straw and sawdust) carbon sources are added to the soil surface to reduce plant
available soil N via soil microbial immobilization. However, the application rates
used in...
Stem rust, caused by the fungus Puccinia graminis subsp. graminicola, can cause yield reductions exceeding 90% on perennial ryegrass (Lolium perenne L.) crops grown for seed if not treated with fungicide in the spring. There is evidence that late-spring stem rust epidemics are initiated by populations that survived the winter....
A nifedipine sustained release dosage form was prepared by using hot-melt batch
coating. Substrates are sugar beads, mesh size 30-35. Stearic acid, Acid Triglyceride, and
carnauba wax were coating agents used to make single layer coated beads and multiple
layer coated beads containing nifedipine. Dissolution of nifedipine from the beads...
This study concerns factors affecting production and survival
of ascospores of Elytroderma deformans (Weir) Darker, a needle
cast of ponderosa pine (Pinus ponderosa Laws.).
The results show that summer cooling and a reduction in host
vigor delays and diminishes the number of fertile hysterothecia
produced. Evidence is offered for classification...
Competitive exclusion has been the mechanism hypothesized to account for the biological control of fire blight disease of pear and apple by the bacterium Pseudomonas fluorescens A506 (A506). Recent laboratory assays demonstrated, however, that A506 produces an antibiotic that is toxic to the fire blight pathogen, Erwinia amylovora, when cultured...
Lead (Pb) and cadmium (Cd) are naturally occurring heavy metals
which have been redistributed to a large extent by man in the environment.
These metals have certain common toxic sites of action on
biological systems of mammals. Simultaneous exposure to Pb and Cd
is highly probable due to common sources...
As species of ash trees become increasingly threatened worldwide by exotic pests and pathogens, it is important to develop descriptions of their ecologies that help guide the conservation and restoration of forests in which they are a major component. Oregon ash (Fraxinus latifolia) is a dominant tree species in wetland...