Resistance of wild rices, Oryza spp., to the brown planthopper, Nilaparvata lugens (Homoptera: Delphacidae)

Of 36 wild rices screened, 19 accessions were resistant or moderately resistant to three biotypes of the brown planthopper, Nilaparvata lugens (Stal), and 9 were resistant or moderately resistant to at least one biotype. Resistant accessions were nonpreferred and N. lugens caged on resistant accessions had low food ingestion rates, slow nymphal development, reduced longevity, low fecundity, and consequently low populations. Two wild rice species decreased the percent hatchability of N. lugens eggs. Some moderately resistant accessions have tolerance to N. lugens , as indicated by low plant damage ratings and plant loss and high percentage N. lugens survival and weight gain. Wild rices are possible sources of new genes for N. lugens resistance.