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
I have forgotten my password
Register for free to receive our newsletters, add comments to blogs/articles and to save content.
See what events are on near you and browse your bookmarked pages.
Cypress aphid is one of the causes of dieback on conifer hedges. It has become an increasingly problematic on conifer hedges since the 1980s, particularly on Leyland cypress.
Cypress aphid damage
Cypress aphid is a blackish brown sap-sucking insect that infests the stems of some hedging conifers (Cupressus species especially C. macrocarpa, Thuja occidentalis, Chamaecyparis lawsoniana and x Cuprocyparis leylandii) in early summer. This often causes a gradual drying up of the foliage.
There are a number of aphid pests of other conifers and aphid like adelgids can also affect these plants
A hedge that is cared for and pruned during the growing season will be more resistant to cypress aphid damage
Pesticides for gardeners (Adobe Acrobat pdf document outlining pesticides available to gardeners)
Damage is caused by greyish brown aphids that are active from May to November, reaching peak numbers in early to mid-summer.
Adelgids AphidsAphid predatorsBlackfly Chemical labels explained Chemicals: using a sprayer Chemicals: using safely and effectively Cherry blackfly Conifer aphidsConifer careConifers: brown patchesConifers: Pestalotiopsis diseaseCurrant aphids Currant blister aphid Fruit aphids Green spruce aphidHarlequin ladybird Hellebore aphids Juniper scaleLadybirds Leyland cypress: pruningLupin aphid Mealy cabbage aphid Pear bedstraw aphid Plum aphids Privet aphid Raspberry and blackberry aphids RHS statement on pesticides in horticulture Rose aphids Rose root aphid Rosy apple aphid Sooty mouldsWaterlily pests Willow bark aphid Woolly 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.