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The humidity responses of Trogoderma granarium Everts (Col., Dermestidae)

Published online by Cambridge University Press:  10 July 2009

U. Yinon  and
A. Shulov
U. Yinon
Affiliation:
Department of Entomology (Zoology 4), The Hebrew University, Jerusalem, Israel
A. Shulov
Affiliation:
Department of Entomology (Zoology 4), The Hebrew University, Jerusalem, Israel
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Extract

The humidity responses of Trogoderma granarium Events were tested in humidity gradients set up in choice-chambers, each comprising a petri-dish with the lower half divided diametrically into two compartments containing sulphuric-acid soluctions affording different relative humidities and surmounted by a copper-gauze platform on which the insects, released centrally, could move about. Counts of the numbers in either half of the arena were made at 15–minute intervals over two hours.

In a gradient of 20–80 per cent. relative humidity, at 20°C., the average count was significantly greater on the drier side than on the moister one for larvae and adults tested in groups and for larvae and adult males, but not females, tested singly; the response was greater when the insects were tested in groups. Antennectomised adults, tested at 25°C. in a gradient of 20–100 per cent. relative humidity, showed no response, although intact control beetles showed a significant perference for the drier side. When adults were tested in groups at 25°C. in a range of gradients, from 20–10 to 20–100 per cent, a preference for the drier side was invariably shown, the response tending to be greater and to occur more rapidly in larvae than in adults, and as the humidity gradient steepened.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 57 , Issue 3 , November 1967 , pp. 451 - 458
Copyright
Copyright © Cambridge University Press 1967

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