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THRESHOLD TEMPERATURES FOR THE EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE)1

Published online by Cambridge University Press:  31 May 2012

Wm. L. Putman
Wm. L. Putman
Affiliation:
Research Station, Canada Department of Agriculture, Vineland Station, Ontario
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Abstract

Some individual processes, e.g., moulting, in the development of Panonychus ulmi (Koch) can proceed at temperatures as low as 7.2 °C but not at 6.3 °C. the threshold for complete postovarial development lies between 9.2° and 11.7 °C. The threshold for deposition of viable eggs is between 10.7° and 11.7 °C, though some females eclosing at 7.2 °C lay inviable eggs at 9.8 °C. Experimental values obtained in the determination of threshold temperatures can be expressed as two temperatures: the permissive, the lowest experimental temperature allowing a particular process to proceed; and the inhibitive, the highest experimental temperature (below the permissive) preventing completion of the process. The actual threshold lies between these temperatures.

Type
Articles
Information
The Canadian Entomologist , Volume 102 , Issue 4 , April 1970 , pp. 421 - 425
Copyright
Copyright © Entomological Society of Canada 1970

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References

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