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Studies on lucerne flea, Sminthurus viridis (L.) (Collembola:sminthuridae) and other Collembola in the Tasmanian culture steppe

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Ireson, J (1990) Studies on lucerne flea, Sminthurus viridis (L.) (Collembola:sminthuridae) and other Collembola in the Tasmanian culture steppe. PhD thesis, University of Tasmania.

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Abstract

Studies on the lucerne flea, Sminthurus viridis (L.) and other Collembola
of the Tasmanian culture steppe covered two main aspects. These were (i)
investigations into the biological control of S. viridis in pasture with
particular reference to mite predators and (ii) the identification,
distribution, phenology and pest status of other Collembola inhabitating
the culture steppe, particularly the species of pastures and field crops.
(i) Biological control of S. viridis
gurveys of the distribution of S. viridis and the predatory bdellid mite,
Bdellodes lapidaria (Kramer) showed that the mite was uncommon in parts
of north-west Tasmania where the pest status of S. viridis was high.
Additional investigations at monitored sites in north-west Tasmania where
B. lapidaria was present failed to indicate any significant predator-prey
relationship between B. lapidaria, S. viridis or other surface-active
Collembola. Data obtained on the distribution and phenology of other
species of predatory mites from the families Bdellidae, Parasitidae and
Anystidae also provided no evidence that any of these were having a
significant impact on S. viridis populations. The poor control of S.
viridis by established predators led to the initiation of a programme to
introduce another predator of S. viridis, the bdellid Neomologus
capillatus (Kramer) from Europe. The predator was successfully
established in north-west Tasmania where B. lapidaria is uncommon.
.(ii) Identification, distribution, phenology and pest status of
Collembola in the Tasmanian culture steppe.
Surveys and population monitoring at selected sites in improved pastures
enabled the identification of 51 surface-active species from 6 families
and 10 euedaphic species from 3 families. Comparison of the fauna of
both the high and low rainfall pasture ecotypes of the State showed that
most surface-active species occurred in both ecotypes, although
differences between the two were reflected by differences in the
adaptability of some species as revealed by variation in their
frequencies of occurrence and phenology. Species were shown to have
regular annual cycles, however, there was variation in patterns of
seasonal periodicity, and temperature and rainfall were shown to have a
significant impact on populations.
Surveys of field crops resulted in the identification of 26 surfaceactive
species and only two of these were not collected from pasture.
Differing preferences by some species for either the crop or pasture
habitat were noted and there was an indication of differing preferences
by some species for crops in high and low rainfall areas. Field and
laboratory studies on the pest status of Collembola in field crops showed
that S. viridis was the most injurious, although field damage by the
garden springtail, Bourletiella hortensis (Fitch) and root-feeding
Onvchiurus spp. was recorded.
A key is given to the species identified in the study including separate
keys to Onychiuridae and Hvpocrastrura spp.

Item Type: Thesis (PhD)
Keywords: Lucerne flea, Collembola
Copyright Holders: The Author
Copyright Information:

Copyright 1990 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Chapter 3 appears to be the equivalent of a peer reviewed version of the following article: Ireson, J. E. (1982) A re-examination of the distribution of the pasture snout mite, Bdellodes lapidaria (Kramer) (Acari: Bdellidae) and the lucerne flea, Sminthurus viridis (L.) (Collembola: Sminthuridae) in Tasmania. J. Aust. ent. Soc. 21: 251-255. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."

Date Deposited: 19 Dec 2014 02:33
Last Modified: 11 Mar 2016 05:55
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