insect on Norfolk pine
HAVE a small Norfolk pine tree in a large barrel on my front porch.
I live beside the sea but I seem to have a problem with some kind
of scale. My tree is starting to die from the bottom up. The scale
is yellow and black in colour and nothing I put on it seems to help.
Please help me save my tree - it was a present from my son.
AM assuming that your scale is the insect variety and not a fungal
lesion. Scale can be a real problem if it gets out of control. The
types of chemical you need to use are Yates Orthene, Confidor or
Conqueror Oil. The first two are systemic, so the insect takes it
up when feeding. The oil coats the insect and suffocates it. Reapply
the insecticide a couple of times to get rid of the scale completely.
Alternating the chemicals is a good idea so that the insects don't
build up a resistance. If your scale is of the fungal type you will
need to try Yates Bravo or Greenguard. If the fungal problem is
a severe case, then the plant may not be able to be saved. Check
the drainage and the position the pot is in - it may need to be
raised off the floor.
Gardener, Issue 102, 2002, Page 20
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.