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Cypress Aphids



P_cypressaphids

Cypress Aphids

Usually appear in

Spring to Autumn


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Caused By:-     The Aphid Cinara cupressi

Description

This aphid pest is causes widespread dieback of several popular hedging Cupressus species including Monterey & Italian Cypresses, x Cupressocyparis leylandii (Leyland Cypress), Chamaecyparis lawsoniana, Lawson Cypress, and occasionally Thuja occidentalis (Eastern White Cedar).
Once the yellowing of the leaves is spotted the process is irreversible.
Cypress aphids cause damage by sucking cell sap from within plant leaves and causes patches of yellow foliage, which later turns brown and dies, from the base of the tree from late Spring to Early Autumn. Further branch die-back spreads upwards and to adjacent plants.
The aphids are are relatively large (2-4mm long) with pear-shaped grey to brown bodies and are difficult to see on the leaves.
Because of the recent changes in classification of C. cupressi as a species is composed of two separate species, C. cupressi and C. cupressivora, identifying the geographical range of the specimen is the most accurate way to determine classification. The two species range's only overlap in the UK.
Picture by William M. Ciesla, Forest Health Management International, Bugwood.org.
See also these other aphids Aphids, Blackfly, Green Spruce, Honeysuckle, Juniper, Lettuce Root, Lupins, Mealy Cabbage, Mealy Plum, Melon Cotton, Peach, Rose, Rosy Apple, Willow Bark Aphid, Wooly.


Control

Spray in early spring even if there is no visible sign of damage, it can be too late when signs of damage are visible.
Research has shown that aphids can quickly mutate to become pesticide-resistant. If using organophosphates or carbamates, rotate spraying between two or three different types.
Insecticidal soaps is another useful spray.
Encourage beneficial insects like Ladybirds Lacewings, Hoverflies, Spiders and Parasitic Wasps. in the garden These predators eat the aphids and keep this pest to a minimum.
Winter plant oil wash plants if possible as this will get rid of overwintering eggs.

P_cypressaphids P_cypressaphids2

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