ISSN 1362-1971
An international journal of the Systematic and Applied Acarology Society, published since 1996
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ISSN 1362-1971 An international journal of the Systematic and Applied Acarology Society, published since 1996 [Aims] [Editors] [Content] [Subscriptions] [Contact details] [Society Homepage] |
Systematic & Applied Acarology
(2009) 14, 19–29.Local dispersion and damage of
Corymbia citriodora subsp. variegata (Myrtaceae) regrowth by eriophyid mites (Acari: Eriophyoidea)HELEN F. NAHRUNG
1 & RACHEL WAUGHHorticulture and Forestry Science, Queensland Department of Primary Industries and Fisheries, Gate 3 80 Meiers Road,
Indooroopilly, Queensland, 4068, Australia
1 Author for correspondence. E-mail: helen.nahrung@dpi.qld.gov.au; Telephone: +61 7 3896 9781; Facsimile: +61 7 3896 9567Abstract
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.Key words:
eucalypt, forestry pests, spotted gum, Australia, Rhombacus, Acalox ptychocarpiReferences
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