Abstract
HA79317-7 and Xiangwanxian-1 which have moderate resistance to BPH, were grown in about 6% of the hybrid rice area (36% of the Hunan rice area). One of HA79317-7’s parents is IR36; Xiangwanxian-1 is a cross with ASD7 (both IR36 and ASD7 carry gene bph 2). Most hybrid rice varieties appeared to be moderately resistant in the field. Most local improved varieties were susceptible to BPH. This investigation suggests that HA79317-7 and Xiangwanxian-1 and the hybrid combinations currently used, that are not known to have resistance genes, have not caused the phenotypic changes in N. lugens populations of Hunan.
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