Q. I have two bamboo plants. One has a much smaller leaf than the other. One is a tree-like plant in the corner of two walls, and the other is a screen behind a small wall, which acts as a partition. I have noticed that the leaves on both plants have a very shiny sticky substance on. What is it and why is this happening?
-Warwick, United Kingdom
A. Without seeing the plants or photos it is difficult to say what types of bamboo they are. A sticky substance at this time of year tends to be honeydew left by aphids or scale insects, although usually they don’t attack bamboo.
Are they healthy otherwise? Are there any overhanging trees that may be depositing honeydew on them? Is the sticky substance all over, or is it a “track” of stickiness?
If you could answer those questions I may be able to help further.
Claire Brown, Plant Passion
Advising gardeners & enhancing gardens in the Guildford and Horsley, UK area
Another answer!
A. The primary source of stickiness on plants is Aphids…any sign of an infestation? If not, keep an eye on the plant and if it seems like the plants are suffering, you can treat for aphids (insecticidal soap is good). In the meantime, try spraying it off with a hose.
Barbara Emerson, Have Green Thumb
Manchester, Massachusetts
