Pests and Diseases Viewer

Juniper Aphids



P_junipaphids

Juniper Aphids

Usually appear in

Spring to Autumn.


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Caused By:-     Various species of Cinara aphids.

Description

Aphids are insects that suck the sap from any trees it lives on.
In the case of juniper there are at least five Cinara species that attack juniper depending on where in the world the tree is located. These are Cinara cupressi C. fresai C. juniperi C. piceae and C. pinea.
The excretion of sugary honeydew may also led to the formation of various moulds which turn the leaves black.
Ants will also farm the aphids for the honeydew.
The young shoots are usually affected and they may turn brown and die back.
The aphids can hatch from eggs or be live birthed which enable them to rapidly infest a large area quickly.
Picture by Edward H. Holsten, USDA Forest Service, Bugwood.org.
See also these other aphids Aphids, Blackfly, Cypress, Green Spruce, Honeysuckle, Lettuce Root, Lupins, Mealy Cabbage, Mealy Plum, Melon Cotton, Peach, Rose, Rosy Apple, Willow Bark Aphid, Wooly.


Control

Washing the aphids from the leaves with a strong water jet will work, but it is almost impossible to eject them all. Encourage natural predators and parasites like birds, ladybird beetles, lacewings, and parasitic wasps will keep the aphids in check. Spraying with an insecticide will often eradicate them, but there can be more than one generation per year and spraying may need to be repeated. Often too high a nitrogen fertiliser may exacerbate the situation as the aphids prefer the softer young shoots.



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