Home           Contact us           FAQs           
 
   Journal Page   |   Aims & Scope   |   Author Guideline   |   Editorial Board   |   Search
    Abstract
2013 (Vol. 5, Issue: 3)
Article Information:

Incidence of Winter and Summer Diapause in Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) in Andhra Pradesh, India

Deepak R. Jadhav, Nigel J. Armes and Vinod S. Bhatnagar
Corresponding Author:  Deepak R. Jadhav 

Key words:  Heliothis armigera, monsoon, population dynamics, summer diapause, temperature, winter diapause,
Vol. 5 , (3): 40-51
Submitted Accepted Published
January 25, 2013 February 07, 2013 May 25, 2013
Abstract:

The incidence of winter and summer diapause was studied by large-scale field samplings of larvae and pupae of the cotton bollworm, Helicoverpa armigera (Hüb) conducted over a period of 13-years during winter and summer seasons in Andhra Pradesh, India. Induction of winter diapause was associated with cooler prevailing temperatures and shorter day lengths of <12 h in November-January. On the other hand, summer diapause was observed at temperatures >32°C during March-April resulting in greater adult emergence with the onset of the monsoon season during mid-June to early July. In summer, few alternate hosts are available for larvae to sustain by allowing local populations colonizing newly germinated host crops with the onset of the rainy season. In addition, the incidence of winter and summer diapause was higher in male pupae than females in the ratio of 4:1 and 3:1 (♂:♀), respectively. Diapause populations of H. armigera were most common in the cyclonic weather prevailed for several weeks during 1977-78 (15.11%) and 1995-96 (17.64%). Under these conditions, an average of <4% and <6% of pupae entered winter and summer diapause, respectively and was associated with severe outbreaks of H. armigera in subsequent seasons. Higher populations of H. armigera on pigeonpea and chickpea entered winter diapause on pigeonpea and chickpea and summer diapause on irrigated maize, pigeonpea, chickpea and a common weed host, Datura metel.
Abstract PDF HTML
  Cite this Reference:
Deepak R. Jadhav, Nigel J. Armes and Vinod S. Bhatnagar, 2013. Incidence of Winter and Summer Diapause in Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) in Andhra Pradesh, India.  Asian Journal of Agricultural Sciences, 5(3): 40-51.
    Advertise with us
 
ISSN (Online):  2041-3890
ISSN (Print):   2041-3882
Submit Manuscript
   Current Information
   Sales & Services
   Contact Information
  Executive Managing Editor
  Email: admin@maxwellsci.com
  Publishing Editor
  Email: support@maxwellsci.com
  Account Manager
  Email: faisalm@maxwellsci.com
  Journal Editor
  Email: admin@maxwellsci.com
  Press Department
  Email: press@maxwellsci.com
Home  |  Contact us  |  About us  |  Privacy Policy
Copyright © 2009. MAXWELL Science Publication, a division of MAXWELLl Scientific Organization. All rights reserved