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Two species of green shield bugs now occur in Britain. The common green shield bug (pictured above) is native to Britain, and of widespread occurrence, but the southern green shield bug is a recent arrival from elsewhere in Europe that became established in the London area in 2003.
These bugs are sap-sucking insects that can be found on a wide range of plants. The adults, when viewed from above, have a distinctive shield-like shape.
The southern green shield bug (Nezara viridula) became established in the London area in 2003.
The native common green shield bug is harmless, so control measures are not required.
If the southern green shield bug becomes a problem it may be necessary to spray with deltamethrin (Bayer Sprayday Greenfly Killer) or lambda cyhalothrin (Westland Plant Rescue Fruit & Vegetable Bug Killer), but check the instructions to make sure that the type of edible plant you are spraying can be treated with one of these pesticides.
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
Common names Common green shield bug and southern green shield bugScientific names Palomena prasina and Nezara viridulaPlants affected Common green shield bug: various plants. Southern green shield bug: runner bean, tomato and raspberry; also found on the seed heads of ornamental plants, including Caryopteris, Hibiscus, Agapanthus and VerbenaMain symptoms No damage is caused by the common green shield bug. The southern green shield bug may cause distorted bean pods and damaged fruitsMost active April to October
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© The Royal Horticultural Society 2011 / RHS Registered Charity № 222879/SC038262