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Influence of temperature on larval defecation and its use in estimating canopy population size of pine sawflies (Hymenoptera: Diprionidae)

Published online by Cambridge University Press:  10 July 2009

J. Simandl
J. Simandl*
Affiliation:
Institute of EntomologyCzech Academy of Sciences, České Budĕjovice, Czech Republic
*
Dr Jiří Simandl, Institute of Entomology, Czech Academy of Sciences, Branišovská 31, 370 05 České Budĕjovice, Czech Republic.
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Abstract

The frequency of defecation in relation to constant0/simulated outdoor temperatures and larval age (instar) was examined under laboratory conditions in four species of pine sawflies (Diprionidae): Gilpinia frutetorum (Fabricius), Diprion pini (Linnaeus), D. similis (Hartig) and Macrodiprion nemoralis (Enslin). Defecation interval and total faecal production was regular under higher constant temperatures (higher production in younger instars, second and third) and production significantly decreased under varying air temperatures during the same period (24 hours) when larvae of younger instars were influenced more by lower temperatures. The influence of larval age (instar) on faecal production was insignificant if larvae were exposed to varying temperatures during 24 hours. Faecal production and temperature were positively correlated in each of the four species and instars tested, as well as in total (all the test species and instars combined). Implications of the results for estimating canopy larval density by frass-drop measurements in the field are briefly discussed.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 83 , Issue 2 , June 1993 , pp. 245 - 249
Copyright
Copyright © Cambridge University Press 1993

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