Breakdown of resistance to sorghum midge, stenodiplosis sorghicola

Sharma, H.C. and Mukuru, S.Z. and Manyasa, E. and Were, J.W. (1999) Breakdown of resistance to sorghum midge, stenodiplosis sorghicola. Euphytica, 109 (2). pp. 131-140.

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Abstract

Sorghum midge (Stenodiplosis sorghicola) is an important pest of grain sorghum worldwide. Several sources of resistance to sorghum midge have been identified in the world sorghum germplasm collection, of which some lines show a susceptible reaction in Kenya. Insect density damage relationships were studied in a diverse array of 10 midge-resistant and midge-susceptible sorghum genotypes, and variation in association of glume and grain characteristics with expression of resistance to sorghum midge. AF 28 and IS 8891 showed resistance to sorghum midge both in India and Kenya; DJ 6514 and ICSV 197, which are highly resistant to sorghum midge in India, showed a susceptible reaction at Alupe, Kenya. Sorghum midge damage in general was greater in Kenya than that observed in India at the same level of midge density suggesting that the breakdown of resistance in Kenya is due to factors other than insect density. Glume length, glume breadth, and glume area were positively associated with susceptibility to sorghum midge at both locations. However, under natural infestation, the correlation coefficients were stronger in India than in Kenya. Grain mass at 3 and 6 days after anthesis was positively associated with susceptibility to midge in India, but did not show any association with midge damage in Kenya. Grain growth rate between 3 and 6 days after anthesis was more strongly correlated with susceptibility to midge in Kenya than in India. Variation in the reaction of sorghum genotypes across locations may be partly due to the influence of environment on association between glume and grain characteristics with susceptibility to sorghum midge, in addition to the possible differences in midge populations in different geographical regions

Item Type: Article
Author Affiliation: International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Andhra Pradesh 502 324, India
Subjects: Plant Protection > Pests
Crop Improvement > Genetics
Crop Improvement > Plant Breeding
Divisions: Sorghum
Depositing User: Mr B Krishnamurthy
Date Deposited: 08 Mar 2011 22:39
Last Modified: 08 Mar 2011 22:39
Official URL: http://dx.doi.org/10.1023/A:1003724217514
URI: http://eprints.icrisat.ac.in/id/eprint/1608

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