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Peronosclerospora sorghi (sorghum downy mildew )
Peronosclerospora sorghi
sorghum downy mildew
Sclerospora andropogonis-sorghi, Sclerospora graminicola var. andropogonis-sorghi, Sclerospora sorghi, Sorosporium andropogonis-sorghi
Worldwide
Primarily in the SE US, though reported in MN, MD, IL, IN, NM, NV
2022-05-24
fungus
Mexico, Korea
sorghum,corn
PRSCSO
Only tropical Peronosclerospora downy mildew known to occur in NA and EU
2 Known Hosts
Sorghum bicolor
sorghum
Yes
PRSCSO-4, PRSCSO-5
Mycelium may invade seed parts. Transmission is low and occurs when immature seed are planted immediately after harvest. Transmission was prevented by seed storage (>40 days) and seed drying to 9%. Oospores may be associated with seed or seed debris.
Yes
Visual examination, Wash test, Grow out, PCR
These methods have been validated or standardized. NSHS standard method for this pathogen in corn is the Grow out.
PRSCSO-1
Metalaxyl
The movement of this pathogen by seed is more of a problem in farmer saved seed. Routine seed conditioning and cleaning practiced by seed companies eliminates these sources.
PRSCSO-1, PRSCSO-3
PRSCSO-4
Bonde, MR. 1982. Epidemiology of Downy Mildews of Maize, Sorghum and Pearl Millet. Tropical Pest Management 28:49-60
PRSCSO-5
Adenle VO, Cardwell KF, 2000. Seed transmission of maize downy mildew (Peronosclerospora sorghi) in Nigeria. Plant Pathology, 49:628-634
PRSCSO-1
Peronosclerospora sorghi In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
PRSCSO-3
Odvody GN, Frederiksen RA, 1984. Use of systemic fungicides metalaxyl and fosetyl-Al for control of sorghum downy mildew in corn and sorghum in South Texas. I: seed treatment. Plant Disease, 68:604-607
Zea mays
corn
Yes
PRSCSO-4, PRSCSO-5, McGEE, ISFRPLD
Seed transmission is rare and only occurs on immature seed or freshly harvested seed that has not been dried., Oospores are not produced abundantly in corn.
Yes
Grow out
This is a standard method of the NSHS
Grow out is a standard method of the NSHS.
NSHSUSDA
Metalaxyl
The movement of this pathogen by seed is more of a problem in farmer saved seed. Routine seed conditioning and cleaning practiced by seed companies eliminates these sources. Normal seed practices such as drying (<20%) and seed storage for more than 40 days essentially eliminates seed transmission.
PRSCSO-1, PRSCSO-3
PRSCSO-4
Bonde, MR. 1982. Epidemiology of Downy Mildews of Maize, Sorghum and Pearl Millet. Tropical Pest Management 28:49-60
PRSCSO-5
Adenle VO, Cardwell KF, 2000. Seed transmission of maize downy mildew (Peronosclerospora sorghi) in Nigeria. Plant Pathology, 49:628-634
McGEE
McGee, DC. 1988, Maize Diseases; A reference source for Seed Technoligists. American Phytopathological Society, St. Paul, MN USA
ISFRPLD
NSHSUSDA
PRSCSO-1
Peronosclerospora sorghi In: Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
PRSCSO-3
Odvody GN, Frederiksen RA, 1984. Use of systemic fungicides metalaxyl and fosetyl-Al for control of sorghum downy mildew in corn and sorghum in South Texas. I: seed treatment. Plant Disease, 68:604-607
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