Study on the life table parameters of diamondback moth, Plutella xylostella (Lep., Plutellidae) on three plant hosts under laboratory conditions

Document Type : Research Paper

Authors

1 Former M.Sc. Student, Department of Plant Protection, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran

2 Associate Professors Department of Plant Protection, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran

3 Associate Professor Department of Plant Protection, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran

4 Assistant Professor, Department of Plant Protection, Isfahan Research Centre for Agriculture and Natural Resources , Isfahan, Iran

5 Professor, Department of Plant Protection, College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran

Abstract

Diamondback moth, Plutella xylostella (L.) (Lep.: Plutellidae), is the most destructive insect pest of cruciferous crops throughout the world. Crucifer production has been seriously affected by developing resistance of P. xylostella populations to a wide range of insecticides. In population studies, the knowledge of herbivore's population growth on different host plants is of prime importance. In the present study, the influence of host-plant species including rapeseed cv. Okapi, cauliflower cv. Arizona and Chinese cabbage cv. Hero on P. xylostella life-history parameters was studied in the laboratory condition (25±1°C, 70±10% RH and 16L:8D h photoperiods). The parameters longevity, the intrinsic rate of natural increase (rm), net reproductive rate (R0), mean generation time (T) and finite rate of increase (λ) were measured on these host plants. Differences between host plants for fertility life table’s parameters were analyzed using the Birch and Jack-knife methods. The results showed that there were significant differences for the studied parameters between host plants. The lowest and highest rate of P. xylostella regeneration occurred on rapeseed (63.67(♀♀/♀/generation)) and Chinese cabbage (86.08(♀♀/♀/generation)), respectively. Generation period of P. xylostella on rapeseed and Chinese cabbage was estimated 23.78 and 18.1 days, respectively. The lowest rate of finite population increase was obtained on rapeseed, 1.191(♀♀/♀/day), and the highest on Chinese cabbage, 1.279(♀♀/♀/day). The maximum and minimum time needed for doubling P. xylostella population were found on rapeseed (3.965 days) and Chinese cabbage (2.814 days). The highest and lowest intrinsic rates of population were on Chinese cabbage and rapeseed with 0.246 and 0.174 (♀♀/♀/day), respectively.
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Keywords

References

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Iranian Journal of Plant Protection Science
Volume 46, Issue 2 - Serial Number 2
Autumn & Winter
October 2015
Pages 277-284

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History

  • Receive Date: 18 December 2014
  • Revise Date: 04 September 2015
  • Accept Date: 12 September 2015

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