Abstract:
Stem borer (Scirpophaga innotata) and brown planthopper (Nilaparvata lugens) are known as
important pests in rice plants that attack plants from the nursery until just before harvest. Efforts to
introduce new high-yielding varieties need to be carried out to provide farmers with references to
varieties that are resistant or not to pest populations in the field. This study aims to look at the
population levels of stem borer and brown planthopper pests at different planting ages for several
test varieties. The method used wasa randomized block design with 6 varietal treatments (IR14, IR15,
IR16, IR18, IR19, IR20) and 3 tests with sampling intervals every week until 77 days afterplanting
(HST). Data were analyzed using the Analysis of Variance (Anova) method and the Least
Significant Difference Test (LSD). The results showedthat the highest population of stem borers
was found in plants aged 63 HST, namely 8 individuals/clump, while the lowest average population
was found in plants aged 49 HST, namely 1 individual/clump. While the highest brown planthopper
population was found at 77 HST, namely 10 individuals/clump, for the lowest population average
at 63 HST, namely 4 individuals/clump. Populations of stem borer and brown planthopper in fact
preferred rice varietyIR14 with the highest population, while rice variety IR18 had the lowest
population.
Keywords: Nilaparvata lugens, population, rice varieties, Scirpophaga innotata.
