|I have 3 magnolia bushes that have white
|Answer from NGA
July 12, 2010
|I'd use a soil drench such as Imidacloprid (Bayer Advanced Garden Tree & Shrub Insect Control Concentrate). It is 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.
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