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Winter and Spring Distribution and Density of Banks Grass Mite (Acari: Tetranychidae) in Adjacent Wheat and Corn

Thomas O. Holtzer, Thomas M. Perring and Marshall W. Johnson
Journal of the Kansas Entomological Society
Vol. 57, No. 2 (Apr., 1984), pp. 333-335
Stable URL: http://www.jstor.org/stable/25084517
Page Count: 3
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Winter and Spring Distribution and Density of Banks Grass Mite (Acari: Tetranychidae) in Adjacent Wheat and Corn
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Abstract

Density of Banks grass mites (BGM) in corn was found to decline linearly with increasing distance from an infested, adjacent winter wheat field in June 1980. In 4 wheat fields with high densities of BGM along borders with harvested corn, active adult BGM were found at all sampling dates in Jan.-June 1981. Immatures were found only in Feb.-June samples. Intensive sampling of adjacent wheat and corn in June 1981 showed that BGM densities in corn decreased linearly with increasing distance from the wheat/corn border, whereas in the wheat no change was detected with distance from the border. Our quantitative results support previous observations suggesting that BGM colonies are initiated by active mites that have moved into a field rather than by mites that have survived within the field in a dormant state.

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