Diseases caused by Sclerotinia spp., generally known as 'white mold', can affect hundreds of plant species including many important crops. The pathogens are favored by cool, moist conditions, but show surprisingly broad ecological distributions. 1 Several other Sclerotinia species cause diseases other than white mold.
Oxygen dissolves into water from two sources: the atmosphere and from plants in the water. The primary source of oxygen for a pond is from microscopic algae (phytoplankton) or submerged plants.In the presence of sunlight, these produce oxygen through photosynthesis and release this oxygen into the pond water.xygen dissolves in water at very low concentrations. Our atmosphere is 20% oxygen or 200,000 ppm but seldom will a pond have more than 10 ppm oxygen dissolved in itsâ water. Dissolved oxygen concentrations below 3 ppm stress most warmwater species of fish and concentrations below 2 ppm will kill some species.
Energy is obtained more efficiently in the presence of oxygen via the process called aerobic respiration. When there is no oxygen available to break the sugar molecules, some cells are still able to produce energy by the process called fermentation or anaerobic cellular respiration or anaerobic glycolysis.Certain organisms do not need molecular oxygen to produce the energy molecules called ATP.hen there is no oxygen available to break the sugar molecules, some cells are still able to produce energy by the process called fermentation or anaerobic cellular respiration or anaerobic glycolysis. Certain organisms do not need molecular oxygen to produce the energy molecules called ATP.