Journal of Entomological Research
SCOPUSWeb of Science
  • Year: 1998
  • Volume: 22
  • Issue: 4

Genetic variation in the density of settlement and initial mortality of nymphs in lac insects, Kerria spp. (Tachardiidae: Homoptera), thriving on Flemingia macrophylla - a promising bushy host

  • Author:
  • Y.D. Mishra1, A. Bhattacharya1,2, S.N. Sushil1,2, S. Kumar1, S.C. Agarwal1,3
  • Total Page Count: 3
  • Page Number: 381 to 383

1Division of Transfer of Technology, Indian Lac Research Institute, Namkum, Ranchi-834 010, Bihar (India).

2Division of Lac Production, Namkum, Ranchi-834 010, Bihar (India).

3Indian Lac Research Institute, Namkum, Ranchi-834 010, Bihar (India).

Abstract

Performance of different lac insect (Kerria spp.) stocks collected from different localities and host plant species were compared with respect to density of settlement and per cent initial mortality of nymphs on Flemfngia macrophylla - a promising bushy lac host The mean density of settlement varied between 57 and 175 nymphs per square centimetre of the shoot surface, whereas the per cent mortality ranged from 12.94 to 42.8. No correlation between the two traits was established. The genetic coefiicient of variance and heritability in the case of former was estimated to be 16.33 and 85%, whereas in the latter case it was 18.27 and 31.86%, respectively. This suggested independent genetic control of the two productivity linked biological attributes of these insects.