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HISTORIC NOTE
The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)
site maintained by the Florida
Cooperative Extension Service.
Copyright 2005, Board of Trustees, University
of Florida
March 1919
COOPERATIVE EXTENSION WORK IN
AGRICULTURE AND HOME ECONOMICS
UNIVERSITY OF FLORIDA DIVISION OF AGRICULTURAL
EXTENSION AND UNITED STATES DEPARTMENT
OF AGRICULTURE COOPERATING
P. H. ROLFS, Director
A SPRAY SCHEDULE FOR
CITRUS
COPIES OF THIS BULLETIN MAY BE HAD FREE
BY ADDRESSING EXTENSION DIVISION,
UNIVERSITY OF FLORIDA, GAINESVILLE, FLA.
Bulletin 18
TACK UP IN A CONVENIENT PLACE
WHERE THE SCHEDULE
CAN BE REFERRED TO READILY
A SPRAY SCHEDULE FOR CITRUS
COPIES OF THIS BULLETIN MAY BE HAD FREE
BY ADDRESSING EXTENSION DIVISION,
UNIVERSITY OF FLORIDA, GAINESVILLE, FLA.
FRUIT
ENEMY
MATERIALS
TIME OF APPLIC TION
REMARKS
Apply if scab is abundant on old leaves. When
rapefruit Scab Bordeaux mixture JUST BEFORE THE FIRS FLUSH OF Bordeaux Mixture is used it must be followed
3-3-50 GROWTH by two of the specified lime sulphur applica-
tions within two months to reduce scale in-
sects
Scab Lime sulphur solution To be applied if scab infections appear on the
GrapefRust mites 32 Baume; 21/2 gal. in JUST BEFORE THE PETA OPEN new growth, or if rainy weather favorable for
Grapefruit Red spiders 100 gallons scab follows the first application
Grapefruit Scab, Thrips Lime sulphur solution,
3 and Rust mites 21 gal. in 100 gallons plus 13 oz. WHFN 1/3 TO 1/2 T PETALS Add the nicotine if 25 or more thrips per bloom
Oranges Red spiders Nicotine sulphate to 100 gal. of the ARE OFF are present
spray solution
Scab, Thrips R
S Grapefruit Rust mites Lime sulphur solution, 7 TO 10 DAYS AFT R 1/3 TO
Red spiders 21 gal. in 100 gallons 1/2 THE PETALS A OFF
Scab, Scale
Grapefruit Rust mites Lime sulphur solution, 14 TO 20 DAYS AFTER :/3 TO 1/2 To be given if rainy weather favorable for scab
G Crawlers 21/ gal. in 100 gallons THE PETALS ARE OFF .. infection follows the fouhthappjicatin
Rust mis Lime sulphur solution, If any two out of Nos. 3, 4, and 5 have been
Sust mites 2 gal. in 100 to 11/ gal. in 100 APRIL 5TH TO 15TH given, this can be omitted; otherwise this is
Grapefruit Tearstain gallons the critical spraying for rust mite on grape-
fruit
The oil emulsion should be used so that the di-
Grapefruit White fly IN MAY WHEN TTI FRUIT IS luted spray material should contain 1% of oil,
and Scale insects Oil emulsion 1% plus dry soda sul AT LEAST 1 INC I DIAM- that is, if the emulsion contains 66% of oil,
7 Oranges Rust mites phur 2 lbs. in 100 gallons ETER 11/2 gallons would be required for 100 gallons of
S._ water
Grapefruit Lime sulphur solution, On oranges this is the critical rust mite spray,
and ust mites 2 gal. in 100 to 11/ gal. in 100 IN JUNE if the fruit has not received any previous lime
8 Oranges Tearstain gallons sulphur applications
Grapefruit PROBABLY IN SEP OR OCT.,
9 and White fly Oil emulsion 1% BUT CERTAINLY BEFORE FEB. To be given if scale insects or white fly are
Oranges Scale insects 1ST. noticeable
Grapefruit
and
Oranges
Rust mites
Lime sulphur solution,
2 gal. in 100 to 11/2 gal. in 100
gallons
NOVEMBER TO JANUARY
To be given only if rust mites are noticeable
The following spray schedule is the result of a
conference held at Orlando, Fla., Feb. 27, 1919,
participated in by H. R. Fulton, J. R. Winston
and J. J. Bowman, pathologists, and W. W.
Others, entomologist, U. S. Department of Agri-
culture; H. E. Stevens, pathologist, and J. R.
Watson, entomologist, Florida Experiment Sta-
Stion; and E. W. Berger, entomologist, State Plant
Board.
This combined schedule is based on the work
to date of state and federal investigators and
represents their composite judgment regarding
the control of certain citrus insects and diseases
by spraying. The five applications in heavy type
(Nos. 3, 4, 7, 8 and 9) are recommended as suf-
ficient for the control of the enemies usually
destructive on grapefruit in an average season,
provided the spraying is done thoroly. Oranges
will ordinarily require only three applications
(Nos. 7, 8 and 9). Under conditions usually
favorable for disease or insect increase certain
or all of the remaining applications will also be
required.'
The scab applications indicated for grapefruit
may also be required on highly susceptible vari-
eties of oranges of the kid glove type.
Application number 3 will be required on
oranges only when thrips are abundant.
Be cautious about using lime-sulphur solution
when the temperature is above 900 F. If applied
under this condition, use the weaker strength
and be sure of the accuracy of the Baume test
and diluting.
Bordeaux mixture requires 3 pounds of blue-
stone and 3 pounds of lime in 50 gallons of water.
Get the best grade of fresh stone lime obtainable.
Never use air slaked lime. If hydrated lime or an
inferior grade of quick lime must be used make it
four pounds.
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