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Patterns of Resistance in Sorghum to the Sorghum Midge¹

The sources of resistance to midge, Contarinia sorghicola (Coquillett), in sorghum [Sorghum bicolor (L.) Moench] have a need to be characterized so that different types may be consolidated and/or integrated into an effective selection program. Two separate sets of sorghum parents, F₂, F₃, and selfed backcross generations, (F₁₂PF₁)S and (F₁P₂)S, were grown on a Tifton sandy (fine-loamy, siliceous, thermic Plinthic Paleudult) in five-replicate field experiments in 1971 and evaluated for resistance to sorghum midge. No simple inheritance pattern was evident, but the resistance of sorghum line SGIRL-MR-1 was determined to be inherited as primarily recessive. F₂ progenies from nine crosses and their reciprocals were grown in replicated tests in two or more years during 1979–1981. Results revealed significant differences in resistance to the sorghum midge between progeny of reciprocal crosses. The resistance of the lines PI383856 and SGIRL-MR-1 seemed to be inherited differently. The resistance in PI383856 tended to diminish in crossbred progenies when the line was used as a female and resistance in all SGIRL-MR-1 crosses tended to be recessive. Therefore, PI383856 or SGIRL-MR-1 should have utility in breeding for resistance by alternate crossing or backcrossing and selfing during selection. Resistance in PI383856 and SGIRL-MR-1 should be combined into a common source that might be more stable and have a higher level of resistance to sorghum midge damage than either line alone.

Key Words: Host plant resistance • Sorghum bicolor (L.) Moench • Contarinia sorghicola Coquillett • Reciprocal differences

² Research, geneticist and research entomologists, Southern Grain Insects Res. Lab., USDA-ARS, Tifton, GA 31793. Reprints purchased by USDA for official use only.

Received for publication October 3, 1983.