Grain Storage Fungi Associated with Mites1

Authors: GRIFFITHS, D. A.; HODSON, A. C.; CHRISTENSEN, C. M.

Source: Journal of Economic Entomology, Volume 52, Number 3, June 1959 , pp. 514-518(5)

Publisher: Entomological Society of America

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Abstract:

Grain-infesting mites Acarus siro and Tyrophagus castellanii were found in some abundance in samples of commercially stored wheat, the moisture content of which ranged from 13.5 to 15%, which is the range of moisture content at which fungi in thc Aspergillus glaucus group arc likely to predominate. These mites, when developing in moldy grain, picked up spores of the storage fungi and carried these spores on the outside of their bodies, in their digestive tract, and in their feces. As they entered clean grain they inoculated it heavily with spores of these fungi, and later they fed to a considerable extent upon the fungi that developed. They preferred certain fungi to others, and preferred those members of the A. glaucus group, such as A. amstelodami, A. repens, and A. ruber, which thrive in grain of which the moisture content ranges from 18-15%, to A. candidus, A. ochraceus, and A. flavus, which require a higher moisture content. The mites not only sought out the preferred fungi, when given a free choice, but also digested a considerably greater percentage of spores of these fungi than they did of the nonpreferred fungi, which seems a sound biological basis for preference. It is likely that whenever heavy infestations of these mites are found in grain, there will be damage not only from mites feeding on the embryos of the kernels, but also from the storage fungi that accompany them.

Document Type: Research Article

Publication date: June 1, 1959

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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