Pests and diseases on Junipers

by Gail Theron

Junipers are relatively tough and hardy as far as attacks from fungi and insects are concerned and this in itself creates a problem in that I tend to neglect them in any "inspection round" assuming all to be well. Because the foliage is usually quite compact and dense the "pesties" realty go to town and have a ball, undetected.

I have had the following problems:

Leaf scale

Small white scales on the upper and under surface of the leaves. Oleum or folithion is the remedy used at weekly intervals for 3 - 4 weeks.

Red spider

A microscopic sucking insect leaving leaf looking "salt and peppered." Metasystox, a systemic insecticide is good used once and then 3 weeks later. Folithion is a contact spray and one or two applications would be necessary at weekly intervals. The damaged leaves will never recover.

Woolly aphids

A cotton wool and web-like appearance indicates that this is present. The same treatment as for red spider applies.

Mealy bug

Bugs visible, often hide in bark in all nooks and crannies - same treatment as above.

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Random Bonsai Tip

To thicken thin branches make a cut just below the branch or a bud on the branch. The sugars produced in the leaves of the tree move down to the roots through the phloem, this flow of sap is interrupted by the cut and the accumulation of sugars above the cut increases the vigour as it is used by the bud, forcing it into action. As soon as the wound heals the normal sap flow resumes.