leaves on cycad
leaves on my potted cycad are turning yellow. It's growing in full
sun and gets adequate water. Does it need feeding or repotting?
are several reasons why cycad leaves turn yellow. Check the undersides
and stems for scale or mealybug. If they are present, spray with
Confidor, Rogor 100 or Target. Avoid using spraying oil as it can
damage palm foliage and I suspect it may also harm cycads.
It could be that the
mix has run out of nutrients, so feed with a slow-release fertiliser
such as Osmocote or Nutricote. Follow the label directions and don't
overdo it. Alternatively, repot the plant into a larger container
with fresh mix.
Check the roots, too.
You may find mealybug there as well. If so, after repotting drench
the mix with a solution of the same spray. Or you may find some
roots are rotten. Trim off any dead roots, ensure the container
is free draining and repot into a fresh mix. Reduce the watering
frequency - only water when the surface of the mix has dried out.
To help prevent further rot you could drench the mix after repotting
with No Root-Rot, a fungicide for treating root diseases. It's available
in some garden centres.
Gardener, Issue 145, 2004, Page 26
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.