Abundance of white lace lerp psyllids on understorey and canopy river red gums and relationships with foliar sugars and tannins

Steinbauer, Martin J.; Tanha, Reza

doi:10.1111/afe.12528

Cited by 3 publications

(1 citation statement)

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“…Decreases in the abundance of this psyllid were found to correlate with increases in total phenolics. Recently, Steinbauer & Tanha (2023) identified vescalagin (an early‐eluting ellagitannin) as negatively correlated with the abundance of C. albitextura nymphs on both understorey and canopy Eucalyptus camaldulensis Dehnh. (Myrtaceae) hosts.…”

Section: Introductionmentioning

confidence: 99%

Host assessment and feeding behaviour of adult female Glycaspis brimblecombei on preferred and non‐preferred eucalypts

Tanha

Steinbauer

2023

Entomologia Exp Applicata

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Insect herbivores assess plants by integrating responses elicited by a variety of external and internal cues and signals mediated by physical and chemical traits. We investigated host assessment behaviours of adult females of the Eucalyptus‐feeding psyllid, Glycaspis brimblecombei Moore (Hemiptera: Aphalaridae), on 10 species and subspecies (comprising preferred and non‐preferred hosts) using video recordings, electrical penetration graph (EPG) technology, and histological examination of tissues surrounding secondary veins. Our video recordings indicated that the shortest first searching time (mean 7.5 s) occurred on preferred hosts. Females placed on novel (non‐preferred) hosts jumped off leaves in <10 s. We found that host acceptance occurred surprisingly rapidly after stylet penetration, e.g., between 7 and 11 s on preferred eucalypts, suggesting a strong role for gustatory cues. Our histological studies provided no evidence of physical barriers to phloem access. Females produced eight EPG waveforms, as observed for other psyllids and aphids, but the durations of PG (xylem activity) and PE2 (phloem ingestion), in particular, were unlike those recorded for any other hemipteran. On preferred hosts, phloem ingestion represented 21.5% (mean duration 4 h 18 min) of individual feeding bouts, whereas on non‐preferred hosts, there was almost no ingestion from phloem. Xylem ingestion on non‐preferred hosts represented 20.1% (mean duration 4 h 1 min) of feeding bouts, presumably to imbibe water. Thus, contrary to widespread belief, female G. brimblecombei did not feed exclusively from phloem even on preferred hosts, but also regularly ingested from the xylem. This is surprising considering that nymphs construct lerps consisting of approximately 16% sugars, and suggests that adults feed from phloem for shorter periods than offspring. Rapid assessment of hosts could also mean that positive stimuli induced by sugars are opposed by negative gustatory stimuli experienced in non‐vascular tissues. The most likely source of such stimuli are water‐soluble polyphenolic compounds that are widespread in cell vacuoles.

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Section: Introductionmentioning

confidence: 99%

Host assessment and feeding behaviour of adult female Glycaspis brimblecombei on preferred and non‐preferred eucalypts

Tanha

Steinbauer

2023

Entomologia Exp Applicata

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Leaf surface traits may influence host specificity in psyllids of Eucalyptus, Spondyliaspis cf. plicatuloides (Froggatt) and Glycaspis brimblecombei Moore (Hemiptera: Aphalaridae)

et al. 2023

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Spondyliaspis cf. plicatuloides and Glycaspis brimblecombei (Hemiptera: Aphalaridae) are invasive insect pests of Eucalyptus, native to Australia. The insects feed on eucalypt sap, and both psyllid species exhibit clear preferences for different species and hybrids of Eucalyptus. The objective of this study was to identify the constitutive morphological and phytochemical characteristics underlying these host preferences. Four preferred and eight non-preferred eucalypt hosts were selected for evaluation. Thirteen leaf morphological features of the 12 eucalypts were analysed. The non-polar and polar metabolites in and on the surface of leaves of each eucalypt species were extracted, and their chemical composition was analysed using gas chromatography coupled with mass spectrometry. The leaf volatile profiles of hosts and non-hosts of S. cf. plicatuloides and G. brimblecombei did not differ sufficiently to explain the host choices of the two eucalypt psyllids. The leaf polar metabolite profiles of the susceptible hosts of the two psyllids differed significantly but did not explain the host preferences of the two psyllid species. However, preferred hosts of S. cf. plicatuloides and G. brimblecombei had some leaf morphological features and wax metabolites in common. Our results show that particular combinations of leaf morphological features and wax metabolites might influence the host choice of eucalypt-feeding lerp psyllids, but no traits explaining the differences in host-selection behaviour between S. cf. plicatuloides and G. brimblecombei were identified.

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An annotated checklist with a key to the genera of Australian psyllids (Hemiptera: Sternorrhyncha: Psylloidea)

MARTONI,

BARTLETT,

MOIR

et al. 2024

Zootaxa

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The diversity of the psyllids of Australia reflects that of the plants of this country, with large radiations and ecological dominance of Myrtaceae (e.g., Eucalyptus), Fabaceae (e.g., Acacia), Casuarinaceae (e.g., Allocasuarina, Casuarina) and Scrophulariaceae (e.g., Eremophila, Myoporum). Within Australian ecosystems, psyllids are critical components of food webs, especially with respect to providing energy-rich resources for many species of birds and insects and, historically, humans. Furthermore, in horticulture, agriculture and forestry, some Australian psyllid species are considered pests, causing leaf senescence and ‘dieback’, leaf deformation and inducing growth of sooty mould, with some adventive species capable of acting as vectors of plant pathogens. Several species are considered beneficial, having been introduced as biological control agents of weeds. Additionally, some Australian psyllids have established in other countries, or in regions within Australia that are not within their natural range; while others have such limited geographical ranges that they are of conservation concern. Here we provide an updated checklist of the species of Psylloidea present in Australia and updated a previous key to their genera based on adult morphology. This is the first checklist of the Australian psyllids compiled since the most recent global taxonomic classification, and provides detailed information on biogeographical, ecological and anthropogenic aspects, including global distribution, host plant data, pest status, conservation status, parasitoids, predators, and biological control programs. Our checklist includes information on 66 genera and 450 species, 414 formally described and 36 awaiting descriptions. This represents an increase of almost 20% of species since the last published checklist of 2004, which reported 354 described and 21 undescribed taxa. Additionally, we summarise the available information on more than 150 undescribed taxa. Finally, we reported here more than 60 new records, between distributions and host plant associations.

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Abundance of white lace lerp psyllids on understorey and canopy river red gums and relationships with foliar sugars and tannins

Cited by 3 publications

References 73 publications

Host assessment and feeding behaviour of adult female Glycaspis brimblecombei on preferred and non‐preferred eucalypts

Host assessment and feeding behaviour of adult female Glycaspis brimblecombei on preferred and non‐preferred eucalypts

Leaf surface traits may influence host specificity in psyllids of Eucalyptus, Spondyliaspis cf. plicatuloides (Froggatt) and Glycaspis brimblecombei Moore (Hemiptera: Aphalaridae)

An annotated checklist with a key to the genera of Australian psyllids (Hemiptera: Sternorrhyncha: Psylloidea)

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