Consumption, Digestion and Utilization of Sunflower Leaves by Helicoverpa armigera (Hiibner) Treated with Nuclear Polyhedrosis Virus


Affiliations

  • Central sugarcane Research Station, Pune, 412 102, India
  • MPKV, Rahuri, India

Abstract

Effect of three doses of nuclear polyhedrosis virus viz., 5.40 × 108, 5.40 × 105 and 5.40 × 103 polyhedral occlusion bodies (POBs/ml) on consumption, digestion and utilisation of sunflower leaves by 8 days old larvae of Helicoverpa armigera (Hiibner) was studied for a period of 5 days, The food intake, faecal matter production and weight gain of virusfed larvae were significantly lower than those of healthy ones on the fourth and fifth day of inoculation and showed dose-dependent tendency, There was weight gain by both control and virus-fed larvae up to third day, after which the virus-fed larvae lost weight in contrast to gain in weight by control larvae. The approximate digestibility did not show effect due to virus infection. The growth rate, gross and net efficiency of food utilisation were altered during the virus infection.

Keywords

Approximate Digestibility, Consumption Index, Gross Efficiency, Growth Rate, Helicoverpa armigera, Net Efficiency, Nuclear Polyhedrosis Virus.

Subject Discipline

Entomology

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