Evening star., 1933-08-26

Poison Ivy Le'' however. five leaf
lets to each compound leaf, Poison
ivy is spread by its seeds as well as
rapidly growing underground stems.
Control is difficult by mechanical
means as these underground stems
break off easily in the soil and
sprout again freely. Lately it has
been found that certain chem
leaves, not only destroys the green parts
but also works down into the under
ground stems and destroys the entire
plant. The only difficulty is that the
chlorate is equally effective on desirable
plants such as grass and Towering
plants and hence must be used with
care where ivy is close to useful plants.
The New Hampshire Station at Dur
ham recently published a circular on
the use of kainit, a potash fertilizer,
for destroying ivy If equally effective.
kainit would have an advantage over
calcium chlorate in that it would not
take the soil nearly so long to become
again fit for plant culture. Calcium
chlorate is sold under its own name and
also under proprietary trade names.
Like some other groups of plants, the
genus RhuS, to which the poison ivy
belongs, contains some harmless and
useful plants, for example, the smoke
bush so well known as an ornamental
shrub, and also the sumacs, known for
their beautiful leaves and fruits.
Shrubs Under Shade.
4 WRITER in Wisconsin Horticul-
n ture suggests the following list of
shrubs that will endure shade:
Wahoo Euonymus atropurpurens)
witch hazel. Hamamelis virginiana;
smooth hydrangea OHydrangea ar
borescens); honeysuckle, Lonicera spp;
matrimony vine Uycium halimifolium);
n1nebark (Physocarpus opulifolium)
common buckthorn (Rhamnus cathar-
tica); fragrant sumac (Rhus cana
denslS); Towering currant (Ribes odora-
tum); snowberry (SymphoricarpoS race
mosus): coralberry (Symphoricarpos
vulgaris), and mapleleaf viburnum
(Vlburnum acerifolium).
Some of these shrubs are we'll known
here, others are more strictly northern
In habitat, but there may be a sugges-
ton contained for the home gardener
who is contending with shade problems.
Cedar Rust.
THE common field Virginia cedar
innocently enough offers a real
menace to nearby apple orchards
and also to ornamental crabapples, such
as Bechtel's. A fungus disease, known
popularity as cedar rust makes its home
on both cedar and apple, living part
OF its life on the cecar and then
drifting through the air to the apple
foliage, where 1t raises pustule like
swellings on the under side of the leaf,
gradually killing the entire leaf and
causing it to turn yellow and drop. En-
tire orchards of apples may be practi-
cally defoliated. The disease could be
dar or apple, but here home owners
naturally object to the cutting of fine
old cedars about their homes and many
lawsuit has arisen on such grounds
The spores of cedar rust travel un-
usual distances in the air, making the
control problem exceedingly difficult.
japanese Beetles.
4 CCORDING to the Extension Ser
n ice News of the University OF
Maryland, Japanese beetles are
have not yet become sufficiently abund-
ant to cause extensive damage, despite
the fact that they have been in the
States for at least eight yearS. Traps
containing a supply of aromatic geran-
oil attract considerable number of the
beetles. Foliage may be protected by
spraying with lead arsenate with flour
added. Pyrethrum soap sprays are also
effective as contact insecticides. Lawns
may be protected by broadcasting
arsenate of lead at the rate of IS pounds
per 1000 square feet of lawn, but to
make certain even distribution, the ex-
tension service suggests mixing the
arsenate of lead with IS times its vol
ume Of sand, soil or other inert mate
rial.
Local gardeners have not an acute
Japanese beetle problem as yet, but it Is
well to prepare by keeping IN touch
with methods Of control of this om-
nivorous pest.
Garden Notes.
IRON the New Jersey Experiment
Station at New Brunswick there
L have recently appeared the two
following circulars: 1.-THE Care Of Ever
greens" and China Asters," both by