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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.
Adelgids are aphid like insects that suck the sap from conifers. Often covered in a white waxy material some also cause galling on host plants.
Agapanthus gall midge is a new species of fly affecting Agapanthus that can cause buds to become deformed and discoloured and fail to flower. It was first noticed in the UK in 2014 but may have been present for several years.
The metallic blue alder leaf beetle (Agelastica alni) feds on the leaves of alder trees. It has recently become re-established in some parts of England after an absence of more than 60 years.
Alder sucker is a common on alder but the damage caused is seldom serious.
The allium leaf mining fly was first detected in Britain in 2002, since when it has spread and become a problem for allium growers in much of England and parts of Wales. The larvae bore into the stems and bulbs of leeks, onions, chives and garlic with devastating consequences. Affected plants often develop secondary infections and rot.
The caterpillars of angle shades moth can feed on a wide range of wild and cultivated plants. They can be particularly damaging when they eat unopened flower buds.
Ants are abundant insects in most gardens and often cause concern, but they are usually a nuisance rather than a damaging pest.
Aphids are very common sap-sucking insects that can cause a lack of plant vigour, distorted growth and often excrete a sticky substance (honeydew) on foliage which allows the growth of sooty moulds. Some aphids transmit plant viruses which can be a problem on strawberries, raspberries, tomatoes, cucumbers, dahlias, tulips, sweet peas and many other plants.
The caterpillars of apple leaf mining moth feed within the leaves of apple, cherry, ornamental Prunus, hawthorn and birch. This results in long, narrow whitish or brown meandering lines in leaves.
Apple sawfly larvae can damage apple fruits at the fruitlet stage in late spring to early summer, usually affected fruits to drop off in June. This should not be confused with maggoty apples in late summer which are caused by the codling moth.
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