Identification of Sources of Resistance to the Beanfly and Two Other Agromyzid Flies in Soybean and Mungbean12

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Abstract
A total of 6775 soybean and 3713 mungbean accessions was screened for resistance to the beanfly, Ophiomyia phaseoli (Tryon), and 2 other agromyzids, O. centrosematis (de Meijere), and Melanagromyza sojae (Zehntner), in mass screening trials during 2 yr. Since no immune accessions were found in the preliminary screening, we did a directional selection and screened the least affected entries a 2nd and 3rd time. We selected 16 soybean and 28 mungbean accessions that were least affected. When tested at 6 locations around Taiwan, 4 soybean and 3 mungbean accessions were least affected at all locations. These soybean accessions were highly resistant and mungbean accessions were moderately resistant to all 3 species. These accessions are now being used to breed resistance into high yield potential commercial varieties of these crops.

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