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Type: Journal article
Title: Feeding and oviposition behaviour of a gall inducing species of Glycaspis (Synglycaspis) (Hemiptera: Psylloidea: Aphalaridae) and development of galls on the leaves of Eucalyptus macrorhyncha (Myrtaceae) in central western New South Wales, Australia
Author: Sharma, A.
Raman, A.
Taylor, G.
Fletcher, M.
Nicol, H.
Citation: European Journal of Entomology, 2015; 112(1):75-90
Publisher: European Journal of Entomology
Issue Date: 2015
ISSN: 1210-5759
1802-8829
Statement of
Responsibility: 
Anamika Sharma, Anantanarayanan Raman, Gary S. Taylor, Murray J. Fletcher, Helen I. Nicol
Abstract: Glycaspis (Synglycaspis) confined to Australia includes gall-inducing and lerp-forming species that are probably highly specific to different species of Eucalyptus subgenus Eucalyptus. Based on available information, their distribution appears restricted to temperate, south-eastern and southern Australia. This paper reports the biology of an unnamed (suspected new species) of Glycaspis (Synglycaspis) that induces spherical, ostiolate galls on the leaves of Eucalyptus macrorhyncha in central western tablelands of NSW. This species completes two generations in a year. Oviposition elicits a passive response in the leaves of E. macrorhyncha. In this work we demonstrate that the host tissue not only supplies water, but also nutrients to the developing embryo via the embedded pedicel. Feeding action of the first instar initiates the gall and morphogenetic gradients become apparent around the feeding site. These gradients direct gall growth. The gall attains its near final spherical shape during the second instar and this spherical gall remains plugged with sugary material, which all the immature stages secrete from the last abdominal segment. No significant gall growth occurs during the occupation of the gall by the third, fourth and fifth instars. The first and second instars feed on the newly differentiated parenchyma tissue in galls, whereas the third, fourth and fifth instars feed on phloem of galls. Consequently the multi-layer parenchymatous nutritive tissue that initially develops lining the chamber dries and shrivels, when the later instars inhabit galls. This shrinkage induces a gradual thinning of gall walls, which is also aggravated by modest expansive growth of the gall.
Keywords: Hemiptera; Psylloidea; Aphalaridae; Glycaspis (Synglycaspis); Eucalyptus; galls; cecidogenesis; host-specificity; nutritive cells; oviposition
Rights: Copyright of European Journal of Entomology is the property of European Journal of Entomology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use.
RMID: 0030027353
DOI: 10.14411/eje.2015.021
Appears in Collections:Earth and Environmental Sciences publications

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