Black Spots

Mon, 7 Aug 1995 08:04:00 -0400


The black spots on S.flava sound like sooty mould to me. Its
not harmful it just looks a little unpleasant and develops
on sticky drops of honeydew on the leaves. It can indicate
that you may have a pest problem, attacks by scale insect
often result in leakage of plant sap which becomes infected
with the mould.

If I remember correctly Adrian Slack blamed this condition
on poor air circulation in unshaded greenhouses. Whether
shading helps or not I dont know. In my own collection by
this time of year the pitchers are full to the top with
insects and starting to rot - so a bit of sooty mould can
hardly make the plants appearance any worse!

Hope this helps