have had a really bad infestation of scale this summer. It took
me a while to realise what was happening, and as a result, we lost
three pittosporums - two young plants and one tree that was 2m tall.
We almost lost a lillypilly tree as well, but after a harsh prune
and lots of spraying, I think we are getting on top of it. My question
is, how do I ensure I get rid of it all? And is there any way to
stop it happening again? I find your column very helpful - and as
a new gardener, I need all the help I can get.
is a real threat to plants if the infestation is severe. You are
on the right track though, by pruning the trees to thin them out
and get more air circulating. Make sure all of the clippings were
removed or burnt, as the insects will travel onto other plants from
Continue spraying until
you have eradicated the pests and make sure to alternate your insecticides.
Use Yates Orthene, Conqueror Oil or Confidor and use the spraying
oil at either its winter or spring strength when needed. Orthene
and Confidor are systemic, whereas the Conqueror Oil will smother
Gardener, Issue 95, 2002, Page 22
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.