Pests and Diseases Viewer




Usually appear in

Spring to autumn

Back to Pests and Diseases

Caused By:-     Several species of aphids


This picture shows one of e winged aphid which will fly off to lay eggs on another plant.
Aphids suck the sap from leaves and stems and secrete honeydew which makes the leaves below sticky with honeydew which is the sugary sap of the plant. They attract ants and honeybees which feeds on the honeydew.
The honeydew often allows other dark fungus to grow on the leaves which can usually be washed off.
Aphids are often farmed by ants who often move aphids to other parts of the plant so that they can produce more honeydew which the ants feed on. There are many species of aphid, often with its own favourite host plants and individual life cycle. Greenfly and blackfly are the most familiar to gardeners, but there are also yellow, red, orange, brown and aphids that secrete a wooly protection. They are small (usually 2-5 mm long) bottle-shaped, soft-bodied insects and the females can give birth to live young when only a week old. Therefore the spread can occur very rapidly. When the aphid population is large the winged form may be produced which can then fly to new plants.
They generally over-winter as eggs but in mild winters adults may survive.
Another problem with aphids is that they can carry viruses and disease to healthy plants.
Aphids also tends to like the young soft leaves which can be exacerbated by using too much nitrogen feeding.
See also these other aphids Blackfly, Cypress, Green Spruce, Honeysuckle, Juniper, Lettuce Root, Lupins, Mealy Cabbage, Mealy Plum, Melon Cotton, Peach, Rose, Rosy Apple, Willow Bark Aphid, Wooly.


As an emergency quick solution I squish them between the fingers or wash them off with a strong get of water, then later spray with a knock down or systemic insecticide.
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.
Soap and detergent sprays can be effective, but remember that these simply wash off the greenfly, they often return and have another go! 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 tar wash or plant oil wash plants if possible as this will get rid of overwintering eggs.

P_aphids1 P_aphids2 P_aphids3 P_aphids4

Click picture to see larger view and more information   

Back to top