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Life history and population dynamics of the mycophagous mite Tarsonemus granarius Lindquist (Acarina: Tarsonemidae)

White, N.D.G. and Sinha, R.N.

1981 - Volume: 22 Issue: 4 pages: 353-360


Population increasing reproductive rate food granary conditions


Mites of Tarsonemus granarius Lindquist were reared individually at 300C and 90 % relative humidity (RH) on the fungus Alternaria alternata.(Fr.) Keissler. A life table was constructed; the intrinsic rate of increase was 0.162 ~ offspringN/day, net reproductive rate was 5.42 times and mean generation time was 10.43 days; fertilized eggs developed into females (arrhenotoky) and unfertilized eggs developed into males. Populations of T. granarius on agar slants inoculated with A. alternata were observed weekly for 8 weeks at 300 , 250 , and 200C; 90 % and 75 % RH. The number of eggs and sex of the offspring were determined. Populations increased most rapidly at 300C and 90 % RH. Fungi of three species of the Aspergillus glaucus group were found to be an inferior food-source for T . granarius. Population fluctuations of T. granarius under granary conditions were observed at monthly intervals for 21 months in a circular metal bin containing 45.72 tonnes of rapeseed which was stored for 5 years.

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1981 White, N.D.G. and Sinha, R.N.
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