Identification of QL-3 Sorghum, a Source of Resistance toPeronosclerospora sorghi

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Abstract
In 3 yr of testing in India, Botswana, Venezuela and the USA, a selection of the Australian sorghum (S. bicolor) line QL-3 remained free from symptoms of sorghum downy mildew when exposed to oospores and conidia of P. sorghi in field trials. The QL-3 resistance remained effective when inoculated with conidia of the fungus by 4 techniques that resulted in the breakdown of resistance of other field-resistant cultivars. QL-3 was developed first in Australia for resistance to the sugarcane mosaic virus, but this resistance to the virus was also effective in Asia, Europe and the Americas. The QL-3 selection represents a valuable source of combined resistance to 2 important pathogens of sorghum.

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