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Get expert help from the RHS to deal with pests and other problems
Keep a watchful eye for signs of vine weevil beetles nibbling the edges of leaves and their grubs who will be munching on roots below the surface.
Hemerocallis gall midge can have a serious effect on the ability of daylilies to produce flowers. New to Britain in 1989, the midge is now widespread in England and Wales and is established in parts of Scotland.
Small sap sucking hemispherical scale insects can encrust the leaves and stems of a wide range of glasshouse plants.
Most hollies have some leaves infested with leaf miner. The damage can be unsightly but has little impact on the plant’s growth or vigour.
Holm oaks (Quercus ilex) are affected by several leaf mining insects. The most troublesome are two species of leaf-mining moths; Holm oak blotch leaf-miner (Phyllonorycter messaniella) and Holm oak linear leaf-miner (Ectoedemia heringiella).
Horse chestnut leaf-mining moth has spread rapidly across since it was first identified as present in Britain from Wimbledon in 2002. It had probably been present in that area for at least a year before it was discovered. The effect on the appearance of horse chestnut trees in the second half of the summer by the leaf-mining moth can be profound.
Horse chestnut scale became established in the London area in the 1960s and has since spread throughout England and into Wales. Although it is often noticeable on the trunks and branches of trees and shrubs, its presence does not cause serious damage. The heaviest infestations often occur on street trees or plants growing in sheltered places.
Hydrangea scale became established in the UK during the 1980s and has since become widespread in English gardens, it is also found in parts of Scotland and Wales.
The greyish-brown caterpillar like larval stage of iris sawfly can completely defoliate flag iris and other waterside iris in summer.
Small sap sucking juniper scale insects can encrust junipers (Juniperus species) and some other conifers such as cypresses (Cupressus and Chamaecyparis), Leyland cypress (x Cuprocyparis leylandii) and Thuya.
The caterpillars of laburnum leaf mining moth feed within the leaves of laburnum and occasionally lupins. This results in a brown circular blotches on the leaves.
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