Plant Age Effect on the Level of Resistance of Rice “IR36” to the Green Leafhopper, Nephotettix virescens (Distant) and Rice Tungro Virus

Authors

H. R. Rapusas, International Rice Research Institute
E. A. Heinrichs, International Rice Research InstituteFollow

Document Type

Article

Date of this Version

2-1987

Citation

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

doi: 10.1093/ee/16.1.106

Comments

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

Abstract

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.