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Pythium aphanidermatum is a soil borne [1] plant pathogen. Pythium is a genus in the class Oomycetes, which are also known as water molds.Oomycetes are not true fungi, as their cell walls are made of cellulose instead of chitin, they are diploid in their vegetative state, and they form coenocytic hyphae (lacking crosswalls). [2]
The fungus can survive on infected tissues, in the soil, and on living plants. It affects young seedlings, mature plants, and fruit in the field or in storage. White mold can spread quickly in the field from plant to plant. It can also spread in a storage facility throughout the harvested crop.
After germination, transport plants to an area with a temperature of 60–70 °F (16–21 °C). Keep under light for at least 12 hours a day. Plant seeds 6 inches (15 centimetres) apart to prevent crowding. Remove deceased plants to promote growth for newly planted ones.
Rhizoctonia solani root rot on corn roots, magnified 0.63X. Damping off can be prevented or controlled in several different ways. Sowing seeds in a sterilized growing medium can be effective, although fungal spores may still be introduced to the medium, either on the seeds themselves or after sowing (in water or on the wind).
Sewage treatment plants mix these organisms as activated sludge or circulate water past organisms living on trickling filters or rotating biological contactors. [ 5 ] Aquatic vegetation may provide similar surface habitat for purifying bacteria, protozoa, and rotifers in a pond or marsh setting; although water circulation is often less effective.
Pythium. Pythium-induced root rot is a common crop disease. When the organism kills newly emerged or emerging seedlings, it is known as damping off, and is a very common problem in fields and greenhouses. [2]
Trichoderma spp. can also be pathogenic to plants. Trichoderma viride is the causal agent of green mold rot of onion. [ 12 ] A strain of Trichoderma viride is a known cause of dieback of Pinus nigra seedlings.
Achlya is a genus of oomycete (water mold), in the family Saprolegniaceae.The genus includes several plant pathogens including Achlya conspicua and Achlya klebsiana.Unlike many other microorganisms, cell expansion is governed by changes in cell wall strength rather than changes in osmotic pressure. [1]