Cotton root rot has been reported in texas counties from the red river to the rio grande and from tom green county to the neches river.
Cotton root rot spore mat.
What can it be confused with.
Grapes with cotton root rot.
Avoid infested locations plant non hosts or resistant species.
Phymatotrichum root rot also known as cotton root rot and texas root rot is caused by the fungus phymatotrichopsis ominvorum.
As new plant species were brought into our area plant pathogens whether native or not have found their way in to our landscape as well.
Sclerotia germinate and produce strands that grow through soil and eventually contact roots.
Cotton root rot requires high heat conditions to flourish with a soil temperature of about 85 degrees f.
Thus cotton root rot is usually considered a warm weather disease.
To light tan sterile spore mat on the surface of the soil near the host but these mats are not common.
Fresh spore mat of cotton root rot fungus.
Spore mats and conidia.
Spore mat on the moist soil surface during the summer monsoon season.
Rapid wilting and death occurs in hot weather due to the inability of the host plant to take up enough water through its rotted roots.
Factors affecting the disease and fungal survival this fungus can survive many years in soil as sclerotia which can occur at depths of 7 feet.
The strands colonize the root.
Verticillium wilt sudden wilt and root rot due to excessive.
The fungus often forms spore mats on the soil surface during warm rainy weather.
Cotton root rot phymatotrichum omnivorum affects more then 2 000 plant species according to texas a m university.
The fungus thrives in clay loam soil conditions where ph is between 7 0 to 8 5.
Grape cotton root rot is active in the summer months when soil temperatures are at least 80 f.
40 c usually in the months of august and september.
This type of root rot disease is extremely difficult to control but the following information may help.
Spore mats around infected plants.
The fungus attacks more than 2 000 species of broadleaf plants but does not affect monocots grasses.
27 c and air temperature exceeds 104 f.
Spore mats are evidence of the fungal presence but currently spores are thought to have no function in the survival infection or spread of the po fungus.
Phymatotrichum root rot also known as cotton root rot or texas root rot is caused by the soil borne fungus.
Cotton root rot also known as texas root rot and by its scientific name phymatotricum root rot is caused by the the soil borne fungus phymatotrichum omnivorum and is responsbile for serious and usually fatal root rots on more than 2 300 species of plants.
One disease that has over 2 300 host species 1 800 dicots is known as phymatotrichopsis omnivora also referred to as cotton root rot texas root rot and ozonia root rot.
