Seasonal Population Fluctuations of Cotton Bollworm, Helicoverpa armigera (Hubner) in Relation to Biotic and Abiotic Environmental Factors at Raichur, Karnataka, India


Affiliations

  • National Bureau of Agriculturally Important Insects, Bangalore, Karnataka, 560024, India
  • Shrimathi Indira Gandhi College, Tiruchirappalli, Tamil Nadu, 620002, India
  • Shrimathi Indira Gandhi College, Department of M.C.A., Tiruchirappalli, Tamil Nadu, 620002, India
  • Indian Institute of Horticultural Research, Bangalore, Karnataka, 560089, India
  • Agricultural Research Station, Department of Entomology, Raichur, Karnataka, 584101, India

Abstract

An attempt was made to study the effect of abiotic and naturally occurring biotic factors on Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae) with cotton as a model crop system. The results revealed that Chrysoperla sp. (carnea-group) (r = 0.344) was positively correlated with pest incidence and the weather parameters like maximum temperature (r = -0.309) and rainfall (r = -0.288) were negatively correlated with pest incidence. It was observed that post-monsoon season was most favourable for pest occurrence and it was more when the crop was in flowering and boll formation stage. Spiders and Chrysoperla sp. (carnea-group) were positively correlated with pest incidence during winter.

Keywords

Helicoverpa armigera, Cotton, Season, Spiders, Chrysopids.

Subject Discipline

Entomology

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