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J. Life Earth Science, Vol. 1(1): July 2005 pp.1-4 | |||||||||
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PREDATION OF THREE PREDATORS ON TWO-SPOTTED SPIDER MITE, TETRANYCHUS URTICAE KOCH (ACARI : TETRANYCHIDAE) |
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N. Naher, W. Islam and M. M. Haque* |
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Institute of Biological Sciences, University of Rajshahi,
Rajshahi 6205, Bangladesh
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Abstract The predation efficiency of Phytoseiulus persimilis Athias-Henriot, Stethorus punctillum Weise and Scolothrips sexmaculatus Pergande on Tetranychus urticae Koch was studied in the laboratory condition. An adult female P. persimilis, consumed 27.54 eggs, 18.12 immature and 11.32 adults of T. urticae / day but the male predator consumed comparatively fewer preys. An adult S. punctillum devoured 119.67 eggs, 73.67 immatures and 54.33 adults of T. urticae / day. The larvae of S. punctillum are also efficiently voracious as the adults. A larva of S. punctillum consumed 114.33 eggs per day. The adult S. sexmaculatus consumed 58.80 eggs, 38.47 immatures and 15.60 adults / day. The daily consumption of S. punctillum is higher than other two predators and differs significantly (P<0.001). The present results suggest that S. punctillum can effectively check the mite population.
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Key words: Tetranychus urticae, Two-spotted spider mite, Phytoseiulus persimilis, Stethorus punctillum, Scolothrips sexmaculatus.
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