Evening times-Republican. [volume] (Marshalltown, Iowa) 1890-1923, 1905-07-15
Experiment Station at Ames
Sends Out a Bulletin on the
Subject
EASY ONE TO GET RID 6
Insect Readily Destroyed by tho Use
Of Any Of tho Parla Gree or Arson
icaI Poisons--lmportanc, Y Killing
Thorn to Preserve tho Trses--The
Iowa News.
Special to Times-Repnblican

Special to Times Republican,.
Ames, July 15.--The experiment sta
|stion OF the State College has just is
sued the following bulletin, giving
some interesting information regard
ing the cherry leaf slug and how to de-
stroy IT.:
The foliage on many Of the cherry
trees turnout the state lis being SER
iously injured by the cherry leaf slug.
The larval stage OF this insect Is
large greenish worm with Shiny cont
ing. somewhat resembling the snail.
These worms are ravenous eaters, ana
feed upon the tleshy tissue OF the leaf.
In many instances the heshy part Is
entirely removed, leaving only the larg-
er veins and skeleton work.
| The mature insect Is n black four
winged fly and Is a species of saw-fly.
| The females are provided With a pair
| OF saws, which are located In grooves
| under the abdomen and are used for
the purpose OF cutting Sits In the Leaf,
| In which the eggs are deposited. There
are two broods year, the first app
pearing in this region about the first oil
June and the second In August ana
September.
This insect is readily DESTROYED IN
the larva or worm stage and la rapid
~ gaining foothold In Iowa. not be-
cause Il Is so difficult to combat, but
largely because no effort IL heiny made
to hold II In check. 1t can ne easily
killed by spraying with paris green Or
other arsenical poisons. The paris
green may be applied as liquid. using
foun ounces OF the poison and eight
ounces of lime to each fifty gallons OF
water; or ia the form OF a dust, using
one pound OF the poison to twenty
pounds OF common flour or Stacked
lime. II the dust Is used 1t should be
applied early In the morning While tie
dew is on and the atmosphere Is QUIET.
With the late ripening varieties 1t Is
sometimes necessary to spray after the
fruit begins to color. 1t Is not advis-
able to use paris green at this stage.
as She fruit Is readily stained. and he'll
libof> should be used instead, as this
insect.side Is entire harmless to man.
The polssder soon loses its strength,
and care should be exercised to secure
the fresh article.
For the past two years the cherry
leaf spot disease has been unusually
prevalent In many sections, and where
the grower is equipped with spray
pump 1t will be advisable to use the
LIQUID spray and combine with ~ the
Bordeaux mixture, thus spraying for
the leaf spot and this insect at the
same time.
Many growers are Indifferent to the
presence of this insect because 1t does
not affect the fruit. 1t should be borne
in mind, however, that the leaf bears
very important part in the life work
OF the plant All Of the crude sap must
first go to the leaf system, where IT Is
worked over and ,digested, for 1t cannot
be used by the plant until this has been
DONE For this reason 1t is apparent
that good leaf system Is an absolute
essential to the welfare of the plant.
Infected plants will also be attacked
by second brood this season. This IS
sure to very seriously weaken the trees
and cut short next years fruit crop,
or many even kill the trees. Should
a severe winter or a dry summer fol-
low, these weakened trees are likely TO
perish In large numbers.