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

Anamika Sharma, Anantanarayanan Raman, Gary S. Taylor, Murray Fletcher, Helen Nicol

Research output: Contribution to journalArticlepeer-review

12 Downloads (Pure)

Abstract

Glycaspis (Synglycaspis) confined to lerp-forming includes gall-inducing and lerp-fonning 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.
Original languageEnglish
Pages (from-to)75-90
Number of pages16
JournalEuropean Journal of Entomology
Volume112
Issue number1
DOIs
Publication statusPublished - Jan 2015

Fingerprint

Dive into the research topics of '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'. Together they form a unique fingerprint.

Cite this