Biology of the Sorghum Earhead Bug, Calocoris Angustatus (Hemiptera: Miridae) with Description of Various Stages

  • I. G. Hiremath
  • C. A. Viraktamath
Research Article


Detailed biology of the sorghum earhead bug, Calocoris angustatus Lethierry was studied at Dharwad, India during 1979–1981. Egg incubation and nymphal developmental period ranged from 5.6–11.0 and 10.0–17.0 days, respectively. The duration of first, second, third, fourth and fifth nymphal instars was 2.2 to 3.4, 2.3 to 3.0, 2.0 to 2.8, 2.0 to 3.0 and 2.0 to 2.7 days, respectively. The males lived for 8.9 to 17.6 days and females for 12.2 to 21.3 days. Fecundity varied from 57.7 to 267.1 eggs per female. Preoviposition, oviposition and post oviposition periods varied from 1.2 to 2.1, from 7.2 to 14.0 and from 5.0 to 15.8 days, respectively. All the developmental stages of the bug are described.

Key Words

Sorghum earhead bug biology Calocoris morphology genitalia 


La biologie minutieux de Calocoris angustatus Lethierry était étudiée pendant 1979–1981, à Dharwad, Inde. La période d’incubation et de développement variait entre 5.59 et 11.00 et entre 10.00 et 17.00 jours respectivement. La durée de I, II, III, IV, et V nymphal instars était de 2.00 à 3.44, de 2.07 à 3.02, de 2.00 à 2.83, de 2.00 à 2.98 et de 2.00 à 2.71 jours respectivement. Les mâles ont vit pour 8.91 à 17.65 jours et les femelles pour 12.16 à 21.28 jours. La fécondité a changé de 57.7 à 267.1 oeufs par femelle. Les périodes de preoviposition d’oviposition et de post oviposition variaient entre 1.20 et 2.12, entre 7.23 et 15.00 et entre 4.96 et 15.79 jours respectivement. Toutes les étapes développabies de la punaise, comprenant genetalia du mâle et de la femelle sont décrits. Un clé a reconnaitre les différents instars de la nymphe et son sexe est aussi donné.

Mots Clés

Sorghum earhead bug biologie Calocoris angustatus morphologie genetalia 


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Copyright information

© ICIPE 1992

Authors and Affiliations

  • I. G. Hiremath
    • 1
  • C. A. Viraktamath
    • 2
  1. 1.University of Agricultural SciencesDharwad-5India
  2. 2.College of Agriculture, GKVKBangalore-65India

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