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Eucalyptus is often affected by eucalyptus sucker. Although unsightly the damage caused is not usually serious and can be tolerated.
Eucalyptus sucker (Ctenarytaina eucalypti) on eucalyptus
There are several species of sucker or psyllid that can be encountered by gardeners, they are sap sucking true bugs. Eucalyptus sucker feeds on eucalyptus it is similar in appearance to aphids and up to 2mm long, with grey and orange-yellow nymphs and darker adults. Both adults and nymphs can be found clustered on the shoot tips during the summer.
This Australian insect became established in Britain during the 1920s and is now of widespread occurrence in the UK on Eucalyptus species.
Shoots where eucalyptus sucker is feeding are often sticky with honeydew and contaminated with sooty moulds. This insect overwinters as adult insects, they lay eggs on shoot tips from February onwards. There are two or three generations a year.
The damage this insect causes is usually only minor and treatment is not usually necessary. This is fortunate as large trees cannot be effectively treated.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
Chemical labels explained
Chemicals: using a sprayer
Chemicals: using safely and effectively
Eucalyptus gall wasp
RHS statement on pesticides in horticulture
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