Kansas Phytopathological Notes: 1968

Sill, W. H.; Hansing, E. D.; King, C. L.; Dickerson, O. J.; Stuteville, D. L.; Schafer, J. F.; Edmunds, L. K.; Willis, W. G.; Paulsen, Avelina Q.

doi:10.2307/3627657

Cited by 2 publications

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“…In Kansas, SDM was first found in Republic and Riley counties in 1967 and 1968 at the same time as an epidemic was occurring in the corn and sorghum production regions of Texas (5,9,14,16). Subsequent economically serious outbreaks occurred in Kansas in 1978and 1979and in Nebraska in 1987 (8,16).…”

Section: Introductionmentioning

confidence: 99%

Screening Exotic Sorghum Germplasm, Hybrids, and Elite Lines for Resistance to a New Virulent Pathotype (P6) of Peronosclerospora sorghi Causing Downy Mildew

Radwan

Perumal

Isakeit

et al. 2011

Plant Health Progress

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A recent outbreak of sorghum downy mildew (SDM) in Texas has led to the discovery of both metalaxyl fungicide resistance and a new pathotype, P6, in the causal organism Peronosclerospora sorghi. New and alternate sources of host plant resistance are needed for successful management of SDM. To identify sources of resistance, a total of 333 (242 minicore lines representing diverse germplasm from India, 67 commercial hybrids from Kansas, and 24 elite breeding lines from Texas) were inoculated in the greenhouse. Using an established sandwich inoculation technique, artificial inoculation of test lines with P. sorghi conidia, resulting in < 10% infection, were scored as “resistant.” Fifty-two minicore and 20 accessions from Kansas exhibited ≤ 10% infection and were selected as resistant. Out of 52 resistant minicore accessions, 28 were photoinsensitive. Eleven of 20 commercial hybrids from Kansas showed zero percent infection. Thirteen of 24 elite breeding lines from Texas were also resistant. In this study, resistance sources for the new P6 SDM pathotype were identified. The diversity among these materials is expected to provide different single-gene sources as well as quantitative sources of SDM resistance for use in breeding programs. Accepted for publication 13 January 2011. Published 23 March 2011.

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Section: Introductionmentioning

confidence: 99%