Entomology, Department of


Date of this Version



Environmental Entomology 16:1 (February 1987), pp. 106–110.

doi: 10.1093/ee/16.1.106


Copyright © 1987 Entomological Society of America. Published by Oxford University Press. Used by permission.


Plant age of a moderately resistant rice cultivar, “IR36,” had a distinct effect on the level of Nephotettix virescens (Distant) resistance. Plants at 10 d after sowing (DAS) were preferred over those at 20, 40, or 60 DAS. N. virescens survival, growth index, and adult weight were higher on plants 20 DAS than on plants 40, 60, or 80 DAS. Although the total amount of honeydew excreted was similar for “IR36” plants of all ages, the reaction of honeydew on filter paper treated with bromocresol green indicated that feeding in the nutrient-rich phloem was highest on the younger plants. Tungro virus transmission was related to extent of phloem feeding, and the percentage of infection was highest on young plants.