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Effect of Cotton Cultivar on Performance of Aphis gossypii (Homoptera: Aphididae) in Iran

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Abstract:

Cotton aphids, Aphis gossypii Glover (Homoptera: Aphididae), obtained from cotton, Gossypium hirsutum L., fields in the Gorgan region of northern Iran, were colonized on ‘Varamin’ cotton plants in a growth chamber. The development, survivorship, and life table parameters of the cotton aphid were evaluated at 27.5 ± 1°C, 65 ± 10% RH, and a photoperiod of 14:10 (L:D) h of artificial light on five commonly growing cotton cultivars: Varamin, ‘Sealand’ (relatively resistant cultivar), ‘Bakhtegan’, ‘Sahel’ (both relatively susceptible cultivars), and ‘Siokra’ [resistant to Bemisia tabaci (Gennadius)]. The developmental times of immature stages ranged from 4.6 d on Bakhtegan and Varamin to 6.3 d on Sealand ,whereas the immature survival was 97.5 to 65% on Sahel and Siokra, respectively. On average, there were 28.7, 28.3, 23.5, 20.1, and 16.8 nymphs produced per female on Sahel, Bakhtegan, Varamin, Sealand, and Siokra, respectively. The intrinsic rate of natural increase (rm) for cotton aphids on Sahel was the highest, whereas the values for rm varied from 0.284 (nymphs per female per d) on Siokra to 0.368 on Sahel. Jackknife estimates of generation times (T), net reproductive rate (R0), doubling time (DT), and finite rate of increase (λ) on these cultivars were as follows: 9.79–10.84 d for T, 9.23–23.81 nymphs per female for R0, 2.17–3.19 d for DT, and 1.28–1.38 nymphs per female per d for λ. Cotton aphid performance was at its highest on Sahel and lowest on Siokra.

Keywords: Aphis gossypii; cotton aphid; cotton cultivar; life table; plant resistance

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/0022-0493-99.5.1820

Publication date: October 1, 2006

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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