Wilson, A.G.L. and Lewis, T. and Cunningham, R.B. (1979) Overwintering and spring emergence of Heliothis armigera (Hubner) (Lepidoptera: Noctuidae) in the Namoi Valley, New South Wales. Bulletin of Entomological Research, 69 (1). pp. 97-109.
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Abstract
The overwintering of Heliothis armigera (Hb.) was studied in the Namoi Valley, north-western New South Wales, Australia. In field observations, over 80% of pupae formed during late April and May were found to be in diapause and did not resume development until September. Moth emergence from diapausing pupae occurred in a protracted period between September and November. Laboratory studies indicated the probability of two phases of diapause development, one completed under cool soil conditions of winter and a second requiring a temperature above about 17 deg C. The threshold of the second phase was higher than that for non-diapausing pupae and was not normally reached until late September. The times to diapause termination in populations of overwintering pupae were satisfactorily fitted to a geometric distribution, which was reflected in the protracted emergence period of moths in field cages. The limited availability of suitable host-plants for the overwintering generation and for emerging moths is discussed
| Item Type: | Article |
|---|---|
| Author Affiliation: | CSIRO Cotton Research Unit, PO Box 59, Narrabri, New South Wales, 2390, Australia |
| Subjects: | Plant Protection Soil Science and Microbiology > Soil Sciences |
| Divisions: | Sorghum |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 24 May 2012 10:30 |
| Last Modified: | 24 May 2012 10:30 |
| Official URL: | http://dx.doi.org/10.1017/S0007485300017934 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/5726 |
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