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1 April 2014 Life Parameters of Tetranychus urticae (Acari: Tetranychidae) on Six Common Bean Cultivars
S. S. Modarres Najafabadi, R. Vafaei Shoushtari, A. A. Zamani, M. Arbabi, H. Farazmand
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Abstract

It is well recognized that the quality of host plants affects the development and survival of twospotted spider mite Tetranychus urticae Koch. The life table parameters of T. urticae, on six cultivars of common bean (Phaseolus vulgaris L.) (chiti Khomein, chiti Ks21189, red Akhtar, red Ks31169, white Pak, and white G11867) were studied at constant laboratory conditions (27 ± 2°C, 70 ± 5% RH and 16:8 L:D). Total development times of immature males and females were significantly influenced by bean cultivar. T. urticae laid significantly more eggs per day on red Akhtar (16.16) than on the other cultivars. The mean generation time ranged from 23.37 to 34.82 d, and a significant varietal effect was seen. Percentage of egg hatchability of twospotted spider mite ranged from 88.25 to 94.20%. The highest intrinsic rate of increase, was recorded on red Akhtar (0.269 ± 0.031) and the lowest value was obtained on white Pak (0.129 ± 0.048). In addition, net reproductive rate and finite rate of increase of the twospotted spider mite had the highest value on red Akhtar: 62.38 ± 1.05 and 1.30 ± 1.02, respectively. The lowest values of these parameters were recorded on white Pak as 26.11 ± 1.40 and 1.13 ± 1.10, respectively. Doubling time varied significantly on different cultivars and the lowest and highest values were obtained on red Akhtar and white Pak, respectively. Our findings revealed that white beans (Pak and G11867) were less suitable cultivars, suggesting that they are more resistant to the twospotted spider mite than the other cultivars.

© 2014 Entomological Society of America
S. S. Modarres Najafabadi, R. Vafaei Shoushtari, A. A. Zamani, M. Arbabi, and H. Farazmand "Life Parameters of Tetranychus urticae (Acari: Tetranychidae) on Six Common Bean Cultivars," Journal of Economic Entomology 107(2), 614-622, (1 April 2014). https://doi.org/10.1603/EC11205
Received: 25 June 2011; Accepted: 1 January 2012; Published: 1 April 2014
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KEYWORDS
common bean
fecundity
life table parameter
resistance
twospotted spider mite
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