Milford chronicle., 1926-05-21
GRAPES SHOULD BE SPRAYED
EARLY 70 COMBAT DISEASE

With the more or less rapid de-
velopment of the grape buds within
the past few days timely suggestions
relative to the spraying program
have been sent from the office or
County Agent Russell r. Wilson to
all the grape growers for the pur-
pose of again calling their attention
to the importance of putting on the
first application of Bordeaux spray
when the new growth on the vines is
from one-half to three-fourths OF an
inch in length.
Laboratory experiments in addl-
ton to field observations and demon
strations conducted by Dr.. Thos. f..
Manns of the University of Delaware
Experiment Station in cooperation
with County Agent Russell 2. VIII
son in Kent county during the past
five or six years have shown con-
clusively that the early infection OF
the canes is the source of the over
wintering of the several grape dis
eases such as black rot, anrhracnose
dead arm, bitter rot, and ripe rot'
1t is of great importance, therefore,
that the vines be given delayed
dormant spray Of Bordeaux MIXTURE
using the 6-10-50 formula, at the
time this new growth becomes eX-
posed to the spores that are dls-
charged by these various funSuouS
diseases. This early spray IS especl-
ally timely in those vineyards tnaI
show very heavy 'carry-oVer OF
any or all of these diseases on Iast
seasons canes which are the CHIEF
source of infection in the early
spring.
The grape spraying program as
recommended by the Plant Patholo-
gist and the County Agent calls Tor
at least five applications during 1he
season. but the first three sprays Il
proDerly applieI at the right times,
will do more toward controlling
these funguous diseases than any or
all of the later applications of either
dust or liquid materials.
AS stated above, the first spray
should be applied when the new
growth has reached an average
length of three-fourths of an inch,
and the second application should De
made when the new shoots are from
four to seven inches long. The third
application, which is known as the
pre-blossom spray, is the most I'M
portant one for the control OF black
rot and anthracnOse and should be
put on when from ten to fifteen per
cent of the blossoms have opened
The fourth application is made just
about the time the last blossoms are
falling, and is recommended for the
control of all funguous diseases and
insect troubles such as the rose bug
and the root bOrer. To every titty
gallons of Bordeaux Mixture 1t is
advisable to add 115 pounds OF pow
dered arsenate of lead and one-hall
pint of 400 nicotine sulphate. One
mint of molasses to every fifty gal
Ions of spray material is also very
effective in the repulsion of the rose
bugs which are troublesome in many
OF the vineyards at that season OF
the year. The fifth application
should be made when the grapes are
about the size of peas, and the same
ingredients as recommended in the
previous spray should be used to
control such insects as the root bor-
er, rose bug, leaf hoppers and berry
moths.
In addition to the above five appli
cations it is sometimes necessary u
give the vines later sprayings in th'
event of a rainy period or foggy wea
--tner which induce rot development
and often Cause downy mildew t.
form on the foliage. With the ex
ception of the first applications
requires a Bordeaux Mixtur
formula 6-10-50, all the othe
sprays should be prepared on the }
$50 formula, and in every case tn
pressure should run from 175 to 25
hounds in order to insure a NOR
thorough distribution of the spra