Research Counterattack Against New Sorghum FungusBy Jim De Quattro
May 12, 1997
Sorghum ergot (UR-get), an emerging fungus disease, faces more scrutiny at the Agricultural Research Service. ARS has released $100,000 in funds to expand research against the disease, found this year in Puerto Rico and Texas.
Grain sorghum is the nations number two feed grain. Sorghum ergot mainly threatens hybrid sorghum seed crops. Texas is the worlds major supplier of hybrid sorghum seed, and U.S. sorghum winter-nursery programs are concentrated in Puerto Rico. First found in the western hemisphere in 1995, sorghum ergot raced through South and Central America and the Caribbean. Scientists found it in Puerto Rico in February and Texas in March.
Ergot infects only unfertilized ovaries of female sorghum flowers, just before the flowers are ready to accept pollen. The fungus multiplies rapidly, and infected flowers cant make seed. Instead, they exude honeydew, sticky droplets containing spores. Fungal structures are carried readily via harvested seed, wind, insects, machinery and people.
To combat the ergot, ARS will expand research at its Tropical Crops and Germplasm Research Laboratory, Mayaguez, P.R., and its Foreign Disease-Weed Research Laboratory, Frederick, Md. The research will be conducted in cooperation with Texas A&M University. The scientists will:
ARS scientists in Puerto Rico operate a World Wide Web site as an ergot resource for scientists, industry and growers. The site, which includes photos of ergot on plants, is at:
Scientific contacts: Morris Bonde, ARS
Foreign Disease-Weed Research Laboratory, Frederick, Md., phone (301) 619-2860,
fax 619-2880, firstname.lastname@example.org