Growth, Development and Feeding Potential of Grubs of Chilocorlls infernalis Mulsant (Coleoptera: Coccinellidae) on the San Jose Scale, Quadraspidiotus perniciosus (Comstock)

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Authors

  • Department of En Torno Logy and Apiculture, Dr. Y.S. Pannar University of Horticulture and forestry Nauni, Solan-173230, Himachal Pradesh ,IN
  • Department of En Torno Logy and Apiculture, Dr. Y.S. Pannar University of Horticulture and forestry Nauni, Solan-173230, Himachal Pradesh ,IN

DOI:

https://doi.org/10.18311/jbc/2007/15041

Keywords:

Chilocorus Infernalis, Development, Prcdatory Potcntial. Quadraspidiotus Pernicioslis

Abstract

Chilocorus infernalis (Mulsant) completed egg, larval, prepupal and pupal devclopment in 7-8, 12-16, 1-3 and 7-10 days, respectively, on the San Jose scale, Quadraspidiotus perniciosus (Comstock) and required 27-37 (mean 32.8) days for adult formation with 64 per cent survival till adult stage at temperature regime of 16.5-320C and 52-79 per cent rclative humidity. The four larval instars, identified on the basis of width of the head capsule and body length and breadth, required 675-786 (average 732), 514-637 (563) and 183-252 (217) scale insects of I, II and III (adult) instar, rcspectively, and fourth instar grubs consumed 56.1 per cent of the total requirement. In mixed popUlation of the scale insect, mcan consumption by four consecutive larval instars was 26, 38, 56 and 120 scale insects with a mC'ln consumption ot' 8.7. ]2.6, 18.8 and 24.2 scales per day per grub; the overall larval requirement was 155-328 (average 240) scale insects. While III and IV instar grub preferred adult females, the I and II instar grub showed preference for II instar (female).