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Glossary of plant terms

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European walnut aphid, Dusky veined walnut aphid

Affects walnut trees where leaves are damaged and sometimes also green fruits by sap-sucking insect pest; the leaves drop, fruit quality worsens.

aphid (greenfly, blackfly)

These are plant sap-sucking insects which are generally regarded a pest. They may have the common name of greenfly or blackfly and may mass on succulent leaves and apical buds on plants such as roses and honeysuckle. They feed using a stylet which is inserted into the plant tissue, and can exude sticky honeydew (which may be fed on by insects such as ants). They may transfer diseases from plant to plant as they feed. They do have natural predators such as ladybirds.

apple aphid

Damage to young growth on apple trees by sap-sucking insects.

beech woolly aphid

Aphids form dense colonies on shoot tips and underside of leaves.

black bean aphid

Insects mass on shoot tips and undersides of leaves.

cabbage aphid

Pest attacking Brassicas where leaves are deformed by sucking aphid, and spreading of viruses.

carrot aphid

Pest of carrots where damage caused by larvae, heart leaves are curled and the plants stunted.

Cedar aphid

Foliage become coated with a black sooty mould excreted by aphids. Foliage becomes brown and drops off.

conifer aphids

Colonies of insects develop on shoots, branches sometimes trunks. Leaves becomes sticky then a black sooty mould grows. The foliage becomes discoloured or mottled and may drop in severe case; this can happen very rapidly in hot weather. Damage is most apparent on base of tree.

currant blister aphid

Pest affecting red and white currants where upper leaves become twisted, blistered and often tinged red.

Cypress aphid

Sooty moulds develop on foliage and stems produced following sap feeding aphid during summer.

green peach aphid

A pest that in spring damages leaves and shoots by sucking sap; the leaves turn yellow and are shed and the pest spreads virus diseases.

green spruce aphid

The foliage develops a white-yellow mottling, turns brown and drops off during late winter.

honeysuckle aphid

Aphids form colonies on shoot tips and buds which can result in buds aborting and shoot tips drying up.

Juniper aphids

Leaves and stems become coated with black, sooty moulds. Heavy attacks cause yellowing and die-back in mid-late summer.

lettuce root aphid

Plants tend to wilt and make slow growth. When dug up, white, powdery wax can be seen on the roots and soil particles.

lupin aphid

Aphids live on undersides of leaves and flower spikes which become sticky honeydew excreted by pests. Plants may die.

mealy cabbage aphid

Damage occurs from early to late summer. Yellow patches appear on foliage between mid-spring and autumn, waxy grey insects feed on undersides of the leaves and growing tips. Affected leaves become distorted, paled and mottled. Dense colonies can build up rapidly, especially in hot years and go unnoticed on undersides of leaves. Young plants are very vulnerable.

mealy plum aphid

Shoot tips and fruit are invaded by powdery white aphids, these aphids hatch in early spring and colonies build up to damaging level by early summer. They produce large amounts of sticky honeydew, and this encourages a black sooty mould to grow.

melon cotton aphid

Aphids flock on foliage and flowers, sooty moulds then develop. Early death of blooms can occur.

pea aphid

Aphids infest pea plants during early summer.

peach aphids

Foliage becomes crinkled and curled with a yellow-green colour during late spring to early summer.

pear bedstraw aphid

Leaves at shoot tips become yellow-green and curled during the late spring. Sooty moulds grow on foliage.

plum leaf curling aphid

Foliage become tightly curled in the spring.

root aphid

Pest of a small range of plants including lettuces and auriculas which cause the plants to wilt and looks stunted; aphids found among roots.

rose aphid

An aphid that specifically attacks roses, sucking the sap of young shoots and buds, and distorting leaves and flowers. Control may be via an insecticide.

rose root aphid

Aphids suck sap from rose roots and lay eggs that cluster on stems.

rosy apple aphid

Pink-grey insects cluster on young foliage in spring. The leaves become curled and yellow.

Water lily aphid

Green-brown insects gather on lily leaves and flowers. Heavy attacks cause poor growths.

willow bark aphid

Aphids colonise bark, trunks and branches in late summer. Honeydew is excreted which makes stems sticky, and sooty moulds then can develop.

woolly aphid

A name for a species of aphid that has with a protective wool-like covering. It commonly infests apple tree bark where it swells and creates cracks that can lead to canker. Tar oil winter wash is a preventative control, and insecticide sprays may be applied onto the bark.

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