Brownsville herald. [volume] (Brownsville, Tex.) 1910-current, 1928-03-05
By W. j. BACH
Pathologist, Valley Experiment
Station

s ~uAt - utlHB harvested IN some
sections Of the Valley. This is an in
cication that some p~recaution should
% taken to prevent the recurrence
foliage next season. Now is the
time or growers to plan their con-
troll measures.
Citrus scah may be recognized BIZ
the light colored corky LESSONS that
appear as warts or scabs on the
Iruit, often resulting in a distinct
distortion of the fruit. The LESSONS
on the leaves are very similar in ap-
pearance to those on the fruit. They
occur on either surface cf the leaf.
>cab occurs On the fruit and foliage
lemon, sou orange. Setsuma,
mple orange. grapefruit and other
Frus hybrids.
Control Measures
@1he citrus seab fungus affects
only young immature tissue. It is
important, then, TO prevent the scab
organism from entering this tissue.
This can be accomplished BY spray
ing with a fungicide at the proper
time Under Valley conditions, If
scab has been severe on the trees
THIS year, an application Of $3.50
Bordeaux plus ! per cent oil emul-
sion should be made. This should
De followed by an application OF
IN sulphur lao in March March
1880 or when three-quarters Of the
petals have fallen). This applica-
I.on Will serve n double purpose in
that il will no doubt be needed "a
control rust mites.
II scab is present on the trees.
a not severe, the second appIica-
ton as recommended above will
probably be sufficient to control il.
Copper sulphate (blue stone)..s lbs.
Tsone hme 3 lbs.
"~ser :....:.............. so gals.
This Is a $3.50 formula. Hvdrstad
lime may be used instead of stone
lime (using four pounds instead Of
To make convenient stock solu-
lions proceed as follows:
!. Dissolve copper sulphate az the
rate OF one pound in each gallon Of
water, earthenware or glass vessel
never in metal containers). Sus-
peno copper sulphate in a sack In
shef p part Of the water 70 hasten
ION.
Z4Slake the stone line in water A.
Z sate OF pound to each gallon
o. water. These two stock solutions
VIII keep indefinitely IL prevented
from drying out.
For a $3.50 mixture. s gallons 90
I'd and 3 gallons Of CD are sniff
eient Tor 30 gallons Of spray solu-
ton. Twelve gallons Of each xnlu-
ton are required in q ~2O0-ralIo1
tank The required amount Of con-
per sulphate solution should be
poured into the tank. then add the
proper amount Of lime. The avi-
tator should then be started ara
enough OF any good commerriai
oil emulsion added to make ! na-
cent solution. This will ~reauira =
gallons Of an oil emulsion thaI con-
tains approximately 66 per ren+ 49,
tual oil in a 200-gallon tank ~ .:
quarts OF such az emulsion N = 4
gallon tank. Less will be reoniraS 70
an emulsion is used that carries 81
Or 70 per cent actual oil, Al viii -
found IN some commercial Oil ernI-
In order to control seab. II !. ;rr-
perative that the application az sn-s-
material be made at the prona- 49,
IT - recommended that tte arnI;.s
tlcn be made either p~recedire -.
bloom, II Bordeaux is used az 49,
most OF the blossoms have fallsr 20
only q single application "A reor;-.I
avoid spraying when the trees 49,.
n 11ii bloom, rs there is danger ~
knocking some of the fruit.