on my feijoa trees
lovely row of feijoas have a lot of lichen covering their trunks
and branches. The sprays available are all for deciduous trees.
How can we get rid of this please?
on trees do not actually damage the plant they are usually
a symptom of aging kind of like wrinkles! However, if you
want to remove them, you can try one of the commercially available
sprays. Most sprays that will kill off lichens are quite harsh and
are not particularly good for plants, hence the instructions to
use only on deciduous trees when they are dormant. You could try
diluting one of the sprays and trying it on a patch of lichen, leaving
it for a week or two and then checking to see what the effect was,
both on the lichen and your feijoa tree. If all seems well, then
continue the treatment. One other possibility is to cover the trunk
for a while with shade cloth. The lichens you are talking about
will be species that like a lot of sunlight. If you can cover them
they will eventually die.
by Dr Dan Blanchon from Unitec's Diploma in Sustainable Horticulture and Bachelor
of Resource Management.
with permission from NZOOM Home and Garden content,
from the previous
The views expressed here are not necessarily those of the RNZIH