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SOME OBSERVATIONS ON THE BIOLOGY AND BEHAVIOUR OF CAMNULA PELLUCIDA (ORTHOPTERA: ACRIDIDAE)1

Published online by Cambridge University Press:  31 May 2012

P. W. Riegert
P. W. Riegert
Affiliation:
Research Station, Canada Department of Agriculture, Saskatoon, Saskatchewa
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Abstract

A brief historical review of the occurrence of the clear-winged grasshopper, Camnula pellucida (Scudd.), is presented as well as recent information pertaining to the biology of its various life stages. In the egg stage, diapause is more successfully terminated by chilling at 5 °C for 70 days than at either 0 or −7 °C. Embryological development proceeded very favourably at incubation temperatures of 30 °C while 35 °C produced excessive mortality especially to pre-blastokinesis embryos. Most embryos in eggs of this species reach the same pre-blastokinesis stage of development more consistently every year than do those of other pest species of grasshopper in Saskatchewan. Thirty days of chilling at −12, −18, and −23 °C reduced the viability of the eggs by about 10, 20, and 50% respectively. Exposure to −29 °C killed all eggs in 3.5 to 5 hours.

The phototactic and thermokinetic reactions of nymphs and adults, leading to aggregation, basking, and dispersal, are discussed and compared with those of other species. Details of nymphal migrations are described and related to such meteorological factors as wind, temperature, and position of the sun. Some further details of mating and oviposition are described, especially aggregation on egg beds and oviposition in stubble fields. Observations of predation by sandhill cranes and skunks are also recorded.

Type
Articles
Information
The Canadian Entomologist , Volume 99 , Issue 9 , September 1967 , pp. 952 - 971
Copyright
Copyright © Entomological Society of Canada 1967

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