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Local dispersion and damage of Corymbia citriodora subsp. variegata (Myrtaceae) regrowth by eriophyid mites (Acari: Eriophyoidea).

Nahrung, H.F. and Waugh, R. (2009) Local dispersion and damage of Corymbia citriodora subsp. variegata (Myrtaceae) regrowth by eriophyid mites (Acari: Eriophyoidea). Systematic and Applied Acarology, 14 (1). pp. 19-29.

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Organisation URL: http://www.acarology.org
Publisher URL: http://www.nhm.ac.uk/hosted_sites/acarology/saas/

Abstract

Eriophyid mites (Acari: Eriophyoidea: Eriophyidae: Rhombacus sp. and Acalox ptychocarpi Keifer) are recently-emerged pests of commercial eucalypt plantations in subtropical Australia. They cause severe blistering, necrosis and leaf loss to Corymbia citriodora subsp. variegata (F. Muell.) K.D. Hill & L.A.S. Johnson, one of the region's most important hardwood plantation species. In this study we examine the progression, incidence and severity of these damage symptoms. We also measure within-branch colonisation by mites to identify dispersive stages, and estimate the relative abundance of the two co-occurring species. Rhombacus sp., an undescribed species, was numerically dominant, accounting for over 90% of all adult mites. Adults were the dispersive stage, moving mostly within branches, but 12% of recruitment onto new leaves occurred on previously uninfested branches. Damage incidence and severity were correlated, while older leaves had more damage than younger leaves. "Patch-type" damage was less frequent but was associated with higher mite numbers and damage scores than "spot-type" damage, while leaf discoloration symptoms related mostly to leaf age.

Item Type:Article
Corporate Creators:QPIF
Additional Information:© Systematic & Applied Acarology Society
Keywords:Eucalypt; forestry pests; spotted gum; Australia; Rhombacus; Acalox ptychocarpi; arthropod pests; branches; dispersal; leaves; trees.
Subjects:Science > Zoology > Invertebrates > Insects
Plant pests and diseases > Individual or types of plants or trees
Science > Invasive Species > Animals
Forestry
Deposited On:30 Nov 2009 05:19
Last Modified:18 Apr 2011 05:37

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