Group Title: Lake Alfred AREC Research report
Title: Packinghouse newsletter
Full Citation
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 Material Information
Title: Packinghouse newsletter
Series Title: Lake Alfred AREC Research report
Alternate Title: Citrus packinghouse newsletters
Packing house newsletter
Physical Description: v. : ill. ; 28 cm.
Language: English
Creator: Citrus Experiment Station (Lake Alfred, Fla.)
Citrus Experiment Station (Lake Alfred, Fla.)
Agricultural Research and Education Center (Lake Alfred, Fla.)
Citrus Research and Education Center (Lake Alfred, Fla.)
Indian River Research Education Center
Publisher: Citrus Experiment Station
Place of Publication: Lake Alfred Fla
Lake Alfred Fla
Publication Date: January 1968
Copyright Date: 1965
Frequency: irregular
completely irregular
Subject: Citrus fruits -- Harvesting -- Periodicals -- Florida   ( lcsh )
Citrus fruits -- Packing -- Periodicals -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
periodical   ( marcgt )
Additional Physical Form: Also issued on the World Wide Web.
Dates or Sequential Designation: No.1 (Sept. 1, 1965)-
Issuing Body: Issued by the Citrus Experiment Station (no. 1-38); Lake Alfred (Fla.) Agricultural Research and Education Center (no. 39-136); Lake Alfred (Fla.) Citrus Research and Education Center (no. 137-189); and the Ft. Pierce (Fla.) Indian River Research and Education Center (no. 190- ).
General Note: Title from caption.
General Note: Latest issue consulted: No. 202 (Aug. 1, 2005)
 Record Information
Bibliographic ID: UF00095555
Volume ID: VID00004
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 02430250
lccn - 2006229390

Full Text
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Citrus Station Mimeo reportt CES 68-18
January 17, 1968




Harvesting and Handling Section
University of Florida
Citrus Experiment Station
P.O. Box 1088
Lake Alfred, Florida, 33850
(Complimentary to members of the Florida Fresh Citrus Shippers Association,
Others wishing to receive this newsletter, send a dozen stamped preaddressed
envelopes to the above address).

No. 13 (*-*)
Citrus Station Mimeo Report CES 68-18
January 17, 1968

Harvesting and Handling Section



The Florida Fresh Citrus Shippers Association have requested that we write
a brief review of the experience gained since the new citrus fungicide regulation
became effective September 20, 1967. (Florida Citrus Commission Regulation 105-

There are no changes in the Citrus Experiment Station Florida Citrus Com-
mission recommendations for the use of citrus fungicides. Where problems have
occurred in complying with this regulation, they have usually been due to lack
of space in the packinghouse line or to improper application of fungicidal mate-


Degreening It is essential that fruit be in good condition. Fruit degreened
without humidity control are apt to develop peel injury which is accentuated by ANY
treatment such as washing, fungicide application, color-adding, etc. This is also
true of citrus fruit that have been held under drying conditions on trucks, receiving
platforms, packinghouse floors, etc. (For further details see Extension Circular
286, May 1965, Practical Measures for Control of Stem-end Rind Breakdown of Oranges).

Dowicide Application Our recommendation is for a recirculated Dowicide A-
hexamine (Dow-hex) flood type system in which the fruit is wet with this solution
for at least 1-1/2 minutes and then thoroughly rinsed. (For details of this method
see Packinghouse Newsletters numbers 1, 6A, and 10, and the available literature
listed in Newsletter No. 10. Copies of Newsletter No. 10 are still available from
the Harvesting and Handling Section). The Dow-hex fungicidal treatment has been
used and improved for 15 years. Other fungicidal treatments, particularly when
applied under improvised conditions may cause problems. These can be solved if
a few "DO's" and "DON'T's" are followed. Moreover, these recommendations are aimed
at getting maximum decay control, rather than merely meeting the minimum require-
ments of the Fungicide Regulation.


1. Keep the time between picking and fungicide application as short as possible.
During this period protect the fruit from drying conditions.

2. Use the recommended fungicide concentrations. If using Dow-hex, follow
the Citrus Experiment Station Florida Citrus Commission recommendations. If
using a proprietary product, follow the suppliers directions.

3. Make one employee responsible for checking the equipment and solution. The
foreman should be familiar with the equipment and solution. It should be his
responsibility to see that this employee is following instructions.

Newsletter No. 13

4. Have indicator papers for checking pH. The amount of residue and risk
of peel injury are more closely related to pH of the solution than to concen-
tration. pH values between 11.0 and 12.0 are desirable. As pH decreases below
11.0 danger of burn and excessive residues increases. Above pH 12.0 residues
and decay control decrease and the treatment becomes ineffective.

5. Remove rots and splits from the packing line before the fungicide is applied.
Broken fruit interfere with pH control of the fungicide solution. Decayed and
split fruit can break the color-add emulsion, with consequent blotching and
even fruit burn.

6. Allow enough time for the fruit to be wet with the fungicide solution for
at least 1-1/2 minutes. If necessary, fruit can be 2 or 3 deep on a slow
moving slat conveyor during the fungicide application.

7. A thorough rinse is necessary. The effective fungicide is chemically
fixed in the cuts, scratches, plugs, etc., and will not rinse off.

8. Rinse washer brushes well immediately on shutting down for the day.


1. Don't expect effective Dowicide treatment in less than 1-1/2 minutes.

2. Don't leave fruit in a soak tank filled with Dowicide or Dow-hex solution
for more than 5 minutes. The tank should be cleared when shutting down for a
break. This is a good practice even with flood applications.

3. Don't let Dowicide in any form carry over into the color-add tank. Except
in minute quantities these two materials are not compatible.

4. Don't presume that raising the concentration will raise residue and vice-
versa. Concentration and pH are closely interrelated and both must be watched.

5. Don't let water sprays and rinses dilute the fungicide solution. Isolate
these with rubber curtains and separate drains.

6. Don't be content with meeting the minimum residue requirement. Aim for
maximum decay control.

7. Don't expect miracles. All fruit are alive and will decay sometime.
Correct use of fungicides can delay spoilage. Ship only fruit that are sound
and have been well handled.

January 17, 1968

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