Techniques to quantify the feeding activity of Nilaparvata lugens (Still) on rice varieties as based on honeydew excretion are described and their potential as a b.ioassa¥for.bioty~e identification are discussed. Honeydew, excreted on filter paper, was stamed Withnmhydnn and quantified by measuring the area (mm 2) or by weighing. Results were sati~fact<~ry b~t the methods were extremely tedious. Volumetric measurement of honeydew with rrncroplpettes was less sensitive.. The color intensity of one ILliter honeydew streaked on filter paper and treated With 0.001% ninhydrin was determined with a Fujiox™ Densitometer. The method was relatively simple and rapid and was sufficiently precise for biotype identification as based on differential feeding activity.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.