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RESISTANCE OF THE AF‐28 SORGHUM VARIETY TO Contarinia sorghicola

The variety AF‐28 of Sorghum bicolor Pers and the hybrid R‐1090 were compared in relation to the sorghum midge, Contarinia sorghicola (Coquillet), (Diptera: Cecidomyidae) in two counties of the State of São Paulo. They were compared in seven successive monthly trials beginning in September 1972. Averages of 252 and 137 adult flies emerged per head of the hybrid R‐1090 in Campinas and Jaboticabal respectively, while 2.9 and 0.8 emerged from AF‐28. The damage was graded with a visual scale from 0 to 4. Average damage grades of 3.5 and 3.3 were attributed to the hybrid R‐1090 in Campinas and Jaboticabal respectively, while the variety AF‐28 had averages of 0.5 and 0.3, respectively.