14 ~ Friday, September 12, 1986 - North Shore News

TREE AND other landscape plants
are not always adversely affected
by air pollutants from the fuels,
smelter, or smog that seem to be
pervasive in our world.

Many plants actually filter
gaseous pollutants and help cleanse
the air.

And, according tc a US.
Department of Agriculture study
being quoted by the American
Association of Nurserymen, in cer-
tain instances the plants may actu-
ally convert the pollutant to a
nutrient.

Sulfur dioxide, for instance, is
quickly oxidized (changed chemi-
cally) to sulfite sulfur and then to
sulfate sulfur, which can be used
as a plant nutrient. As a nutrient,
the sulfate can end up in the
plant’s roots where an added plus
is that this pollutant-turned
nutrient may then be taken up by
neighboring vegetation.

The research in question was
conducted by plant physiologist
Bruce R. Roberts with USDA's
Agricultural Research Service,
Delaware, Ohio, who says that
some trees and shrubs absorb
pollutants through the stomata.

Tree Talk
By Brian Fisher

YOU MAY have noticed
browning leaves or die back
on your own cherry trees or
cherry trees, in your
neighborhood; particularly
the ornamental varieties.

This blight is generally caused
by fungus and it should be treated.
If it is not dealt with, it may ad-
vance and cause further damage.

All dead fimbs and branches
should be remov-d and all debris
raked up and removed. The tree
should thea be sprayed with
Benomyl. a wettable powder
available at your focal garden
shop.

Benomy! is a systemic fungicide
and should be used as per the label
instructions. Two or three treat-
ments, about two weeks apart
should solve the problem.

With some of the ornamental
cherries, particularly those of the
“weeping’’ varieties, and younger
trees especially, we have seen cases
of bacterial canker,

The symptoms are similar but in
addition to the leaf and twig die
back, gummy deposits appear on
the branches and stems. In this
case, prune out as many of the
dead branches and cankers as
possible, below the diseased area.

Disinfect your pruning tools
after each cut. Copper spray now,

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at leaf drop and again in the early
spring before bud break may bring
this disease under control. ae = : PERCEPT z

This will also help protect the ee
trees from other canker disease. 2
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Watch the trees for signs of insects
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as well.

Insects tend to attack trees that
are weakened or unhealthy. Ef in-
sects (aphids, mites, etc.) are pres-
ent; the tree should be treated for

#1083 Roosevelt Crescent
: North Vancouver (2 blocks behind the Avalon Hotel}

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