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Resistance in bloomless and sparse bloom sorghum sorghum bicolor to greenbugs schizaphis graminum



Resistance in bloomless and sparse bloom sorghum sorghum bicolor to greenbugs schizaphis graminum



Environmental Entomology 10(6): 963-965



Four bloomless (bm-bm) and 3 sparse-bloom (h-h) sorghum entries were evaluated for resistance to biotype C of the greenbug, S. graminum (Rondani), in field tests at Stillwater, Oklahoma [USA], in 1975 and 1976, and the results were compared with those from 7 greenbug-susceptible and 2 greenbug-resistant lines with bloom (Bm). Both bloomless and sparse-bloom entries reduced the reproduction of greenbugs and damage from natural infestations; reproduction and damage were not reduced when greenbugs were confined to small leaf cages. Results of tests in large cages suggested that the resistance in bm-bm and h-h lines may not be effective in seedling sorghum or against the apterous form of the greenbug. Nonpreference was suggested as the mechanism of resistance.

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Accession: 006320224

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