Join the RHS today and support our charitable work
Free personalised gardening advice
RHS members get reduced ticket prices
RHS members get free access to RHS Gardens
Free entry to RHS members at selected times »
Reduced prices on RHS Garden courses and workshops
020 3176 5800
Mon – Fri | 9am – 5pm
Help us achieve our goals
Join the RHS today and support our charity
Beech red spider mite (Eotetranychus fagi) was first detected in Britain in 2004. It is specific to beech (Fagus sylvatica) and can cause extensive bronzing of the foliage.
Beech red spider mite
Spider mites are members of the Acari (mite) family Teranychidae. They generally live on the undersides of plants, where they spin webs and cause damage by puncturing plant cells to feed. Some spider mites feed on a broad range of plants others have a limited host range.
Beech red spider mite (Eotetranychus fagi) is specific to beech (Fagus sylvatica) and was first discovered in Britain in 2004. Adult mites are less than 1mm in length and despite its name are normally a pale greenish yellow.
Infestations cause fine pale yellow mottling (bronzing) of the upper leaf surface with damage particularly concentrated along the larger leaf veins. The undersides of the leaves have black excrement spots and are littered with cast mite skins and egg shells giving them a dusty appearance.
Beech grown as a hedge tends to be more vulnerable to this mite than standard trees.
It is likely to have several generations during the summer months and will overwinter on the bark as eggs.
Although the damage caused by the mites can look unsightly by late summer, it unlikely to affect the long term health of infested trees and can be tolerated. This is fortunate as the pesticides available to home gardeners are unlikely to be effected and it is not practical to spray large trees or hedges.
Chemical labels explained
Chemicals: using a sprayer
Chemicals: using safely and effectively
Glasshouse red spider mite
Grapevine blister mite
Fuchsia gall mite
Lime nail gall mite
Pear blister mite
Woolly beech aphid
the RHS today and get 12 months for the price of 9
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.