Scales - Knowledgebase Question

mentor, Oh
Question by mbocskey
April 27, 2010
How do I get rid of and treat scales on a Magnolia bush ?


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Answer from NGA
April 27, 2010

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You can apply horticultural oil to the plant, available at garden centers. The oil should be applied in late summer or early fall and will control pests by smothering them. If you apply it now, it can burn the leaves. An alternative is a systemic such as Imidacloprid (Bayer Advanced Garden Tree & Shrub Insect Control Concentrate), applied as a drench around the root zone of infested plants. This water soluble insecticide is taken up by the roots and transported throughout the plant where it is ingested by sap feeding insects. This provides a means of scale control without reliance on sprays. Best wishes with your magnolia.

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