Biological and population growth parameters of the melon aphid, Aphis gossypii Glover on cucumber plants grown at different vermicompost: soil ratios (Text in Persian)

Document Type : Research Paper

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Abstract

The melon aphid، Aphis gossypii Glover is one of the most important pests of vegetables in greenhouses. In this research، biological and population growth parameters of A. gossypii reared on cucumber cv Yalda cultivated at different ratios of vermicompost:soil (0:100، 10:90، 20:8 and 30:70%) were studied at 25±2°C، 55±5 % RH and L16:D8. The highest and lowest values of reproductive duration، adult longevity and life cycle period were estimated in control and 30% vermicompost treatment، respectively. The highest and lowest values of gross reproductive rate (GRR) and net reproductive rate (R0) of the melon aphid were obtained in control and 30% vermicompost، respectively. Intrinsic rate of increase (rm) at levels of 0، 10، 20 and 30% vermicompost were estimated to be 0.390، 0.361، 0.372 and 0.323 d-1، respectively. Differences in finite rate of increase (λ)، doubling time (DT) and mean generation time (T) of the aphid were not significant among treatments. Results of this research clearly revealed that the ratio of 30:70 (vermicompos: soil) can considerably reduce biological and reproductive parameters of A. gossypii in greenhouse cucumber.

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History

  • Receive Date: 31 May 2015
  • Accept Date: 31 May 2015

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