Abstract
Abstract Twentysix F, sorghum hybrids were evaluated in a 3 replication RCB design for resistance to sorghum midge (SM) in field trials at the Texas A&M University Agricultural Research and Extension Center, Corpus Christi, and the Texas Agricultural Experiment Station, College Station. The trial was composed of 17 hybrids with experimental Alines crossed to released Rlines, 3 resistant X resistant checks, 2 resistant X susceptible checks, and 4susceptible X susceptible checks. Seed was planted 7 Apr with 96.5 cm between row atCorpus Christi and 29 Apr with 76.2 cm between rows at College Station. SM were not controlled during sorghum flowering to place maximum pressure on resistance genes. Grain yields and SM damage rating of experimental Alines as hybrid seed parents were compared with those of the checks. Physiologically mature sorghum was rated for SM damage on a scal of 1 = 1-10, 2 = 11-20, up to 9 = 81-100% kernel loss. For grain yields, allpanicles pe plot(0.0025 ha) were hand harvested and threshed using a stationary plot thresher. Threshed grain weight was converted to kg/ha to obtain grain yield. ANOVA and LSD.05 were used to analyze data.
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