Jadhav, D R and Armes, N J and Bhatnagar, V S (2013) Incidence of Winter and Summer Diapause in Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) in Andhra Pradesh, India. Asian Journal of Agricultural Sciences, 5 (3). pp. 40-51. ISSN 2041-3890
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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.
| Item Type: | Article |
|---|---|
| Divisions: | UNSPECIFIED |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Heliothis armigera, monsoon, population dynamics, summer diapause, temperature, winter diapause |
| Subjects: | Others > Entomology |
| Depositing User: | Mr Sanat Kumar Behera |
| Date Deposited: | 22 May 2013 04:47 |
| Last Modified: | 22 May 2013 04:47 |
| URI: | http://oar.icrisat.org/id/eprint/6813 |
| Official URL: | http://maxwellsci.com/jp/abstract.php?jid=AJAS&no=... |
| Projects: | UNSPECIFIED |
| Funders: | International Crops Research Institute for the Semi-Arid Tropics, Natural Research Institute, UK, Department for International Development |
| Acknowledgement: | Financial support was provided in 1974-88 by the Farming Systems Research Program of ICRISAT Cropping Systems Entomology and 1991-96 by the Natural Resources Institute, UK, through adaptive research of the UK Government’s Department of International Development (DfID). Authors are grateful to Mr. K.V.S. Satyanarayana, M. Satyanarayana and G. Venkateswarlu for technical assistance. |
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