Dark Knight Blue Mist Spirea with brown spots - Ask Extension
Full name: Caryopteris clandonensis Dark Knight Blue Mist SpireaThe plant was very healthy when I bought it. I planted only two weeks ago, in an ar...
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Dark Knight Blue Mist Spirea with brown spots #460658
Asked June 08, 2018, 10:12 AM EDT
Full name: Caryopteris clandonensis Dark Knight Blue Mist Spirea
The plant was very healthy when I bought it. I planted only two weeks ago, in an area with sun from the morning to about 2 pm. The soil is quite alkaline, a soil test shows pH is in the range of 8.0 (please see attached picture). Water it regularly, once a day.This morning I noticed there are brown spots on the leaves (please see attached picture). Please advice what the problem is, and how I may protect my plant.
Frederick County Maryland
Expert Response
These spots are made by the feeding of a four-lined plant bug, a common occurrence this time of year. Because there is only one generation of this insect a year, it is not around long and its damage is minimal, no treatment is necessary. New growth covers the spots.
Here is more info: http://extension.umd.edu/hgic/plant-bugs-flowers
ECN
Here is more info: http://extension.umd.edu/hgic/plant-bugs-flowers
ECN
