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.
Koi Pond Aeration. Aeration is the term that we use to mean adding air to the water. Since air contains 22% oxygen, aeration adds oxygen to the water. There are a number of very essential pieces of equipment to consider when planning a pond. None more so than a good reliable quality air pump.oi Pond Aeration. Aeration is the term that we use to mean adding air to the water. Since air contains 22% oxygen, aeration adds oxygen to the water. There are a number of very essential pieces of equipment to consider when planning a pond. None more so than a good reliable quality air pump.