Sclerophthora macrospora
downy mildew, crazy top of maize
Phytophthora macrospora, Phytophthora oryzae, Sclerospora macrospora, Sclerospora oryzae, Nozemia macrospora, Sclerospora kriegeriana
Worldwide
AZ, AR, FL, IL, LA, MS, ND, RI, TN, TX
2023-08-21
fungus
Thailand
corn, rice, oat, barley, rye, sorghum, sugarcane
SCPHMA
8 Known Hosts
Avena sativa
oat
No
SCPHMA-4
Although this reference indicates oat seed is a pathway, no references with experimental data were found. This fungus appears to be a minor problem in oat.
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Hordeum vulgare
barley
No
SCPHMA-4
No references found indicating that seed is a pathway.
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Oryza sativa
rice
No
SCPHMA-4
No references found indicating that seed is a pathway.
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Saccharum officinarum
sugarcane
No
SCPHMA-4
No references found indicating that seed is a pathway.
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Secale cereale
rye
No
SCPHMA-4
No references found indicating that seed is a pathway.
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Sorghum bicolor
sorghum
No
SCPHMA-4
No references found indicating that seed is a pathway.
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Triticum aestivum
wheat
Yes
SCPHMA-4, SCPHMA-9
Seedlings from infected wheat seed became infected under laboratory conditions. However, this disease is economically unimportant (SCPHMA-10).
A direct visual method is described for corn.
Seed free from host debris s an important sanitation procedure.
SCPHMA-10
Richardson MJ, 1990. An Annotated List of Seed-borne Disease. International Seed Testing Association, Zurich, Switzerland
Bains SS; Jhooty JS, 1985. Seed transmission of Sclerophthora macrospora in wheat. Seed Research, 13(2):154-156
Wiese, MV. 1977. Compendium of Wheat Diseases. APS Press, The American Phytopathological Society.St. Paul, MN
Zea mays
corn
Yes
SCPHMA-2, SCPHMA-5, SCPHMA-6, SCPHMA-11
Seed is a known pathway for this pathogen. However, the disease is economically unimportant (SCPHMA-11)
Yes
Direct visual method
This method is the standard method of the NSHS
The direct visual method is a NSHS Standard Method
SCPHMA-8
Fungicde seed treatments
Infection declines significantly in storage .
SCPHMA-7, SCPHMA-2
Ullstrup AJ, 1970. Crazy top of maize. Indian Phytopathology, 23:250-261.
Cizmic´ I, 2007. Disease causal agents which are seed transmitted in maize, and maize seed treatment. (Uzrocnici bolesti koji se prenose sjemenom kukuruza i tretiranje sjemena kukuruza.) Glasilo Biljne Zastite, 7(5):282-290. (Abstract only)
LingXiao K; Panchi L; HongJie Z; XingMing Y., 1999. Preliminary studies on initial infection source of crazy top of corn. Acta Phytophylacica Sinica, 26:287-288. (Abstract only)
McGee, DC. 1988. Maize Diseases: A reference Source for Seed Technologists. APS Press, St. Paul, MN USA. 150 pp.
Seed Health Testing Method for Sclerophthora macrospora Mz 5.1 National Seed Health System, 2019. www.seedhealth.org
Segura GW, 1979. Corn seed treatments for possible crazy top control, 1978. Fungicide and Nematicide Tests, 34:158.
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