Survey of Sorghum Earhead Bug and its Natural Enemies in Karnataka

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Authors

  • All India Co-ordinated Sorghum Improvement Project, University of Agricultural Sciences, Dharwad (Karnataka) ,IN

DOI:

https://doi.org/10.18311/jbc/1989/4202

Keywords:

Calocoris angustatus, Natural Enemies, Sorghum.

Abstract

Survey of sorghum earhead bug Calocoris angusiatus Lethierry and its natural enemies conducted for three years (1977-80). In sorghum tract consisting of eight districts in Karnataka revealed the presence of the bug and involvement or only one species with colour variation in all the districts. The bug population was more in Kharif season in Mysore, Bijapur, Chitradurga, Bellary, Dharwad and Belgaum districts compared to other districts. During summer, maximum Incidence was seen at Mysore (16.55 bugs) whereas during Rabi season it was highest in Bijapur (24.00 bugs). The natural enemies found In the survey were Camponotus compressus (L.), Camponoius Paria, Emery, Rhinocoris fuscipes (F.), Geocoris tricolor (F.), Erythraeid mite; Hierodula sp., 16 species of spiders and the entomogenous fungus Cephalosporium. The predatory potential of R. fuscipes, G. tricolor, Hierodula sp., and spiders was assessed under laboratory conditions.