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Factors Influencing the Orientation and Rates of Activity of Dendroctonus ponderosae Hopkins (Coleoptera: Scolytidae)1

Published online by Cambridge University Press:  31 May 2012

R. F. Shepherd
R. F. Shepherd
Affiliation:
Department of Forestry of Canada, Forest Research Laboratory, Calgary, Alberta
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Abstract

The tactic and kinetic responses of adult Dendroctonus ponderosae Hopkins were studied under varying conditions of light, temperature, humidity, gravity, and with different visual forms. Newly emerged adult Dendroctonus ponderosae Hopk. were attracted by high light intensity and utilized spot sources of light and surrounding objects, but not polarized light, for orientation. Flying adults were positively phototactic unless warmed above 35 °C; egg-laying adults were negatively phototactic. High temperatures and light intensities increased the frequency of flights. The beetles were negatively geotropic but this could be masked by the attraction to light. Dark objects on a light background were attractive; the size of the object was important while the shape was not.

Temperature influenced orientation to some extent but its influence on rate of activity was far more pronounced; rate of walk followed a linear relationship with temperature. Humidity also affected orientation and rate of walk to some extent, although its effect was usually masked by other environmental factors.

Type
Articles
Information
The Canadian Entomologist , Volume 98 , Issue 5 , May 1966 , pp. 507 - 518
Copyright
Copyright © Entomological Society of Canada 1966

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