Group Title: Press bulletin
Title: Pruning for withertip and stem-end rot of citrus
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Permanent Link: http://ufdc.ufl.edu/UF00090290/00001
 Material Information
Title: Pruning for withertip and stem-end rot of citrus
Series Title: Press bulletin
Physical Description: 2 leaves : ; 23 cm.
Language: English
Creator: Fawcett, H. S ( Howard Samuel ), b. 1877
University of Florida -- Agricultural Experiment Station
Publisher: Florida Agricultural Experiment Station
Place of Publication: Gainesville
Publication Date: 1912
 Subjects
Subject: Citrus -- Diseases and pests -- Control -- Florida   ( lcsh )
Citrus -- Pruning -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: by H.S. Fawcett.
General Note: Caption title.
General Note: "January 13, 1912."
 Record Information
Bibliographic ID: UF00090290
Volume ID: VID00001
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 - 80241407

Full Text





PRESS BULLETIN 180


January 18, 1912


UNIVERSITY OF FLORIDA



AGRICULTURAL EXPERIMENT STATION






PRUNING FOR WITHERTIP AND STEM-END ROT OF CITRUS
By H. S. Fawcett
Thorough pruning has been found to be a good method of combating
withertip, and is also recommended as an important step in the prevention
of Stem-end Rot. Since the withertip fungus is nearly always present along
with that of stem-end rot, the following recommendations for withertip will
nold good for both diseases.
How to Prune
It is of the highest importance in pruning for withertip to cut out so
much of the wood as to get rid, not only of the bare branches, but also of
all branches that show signs of the disease. In severe cases of withertip
there are seen, in addition to bare branches, many limbs on which the yellow-
ish leaves are about to fall. Close examination will show that the disease
is slowly making its way back and poisoning these limbs. This poisoning
may start from an infection at the tip, or from an infection on a side branch
lower down, from which the poisonous effect has spread to the main limb.
Sometimes only one side of a tree, or only one branch, is severely affected;
while the remaining part of the tree is uninjured. The distance to which
the disease has progressed can frequently be seen by the presence of new
shoots with a sickly yellow color. Frequently the leaves fall from such
shoots before they are half grown, leaving the bare young shoots to dry up.
Whatever may be the conditions, it is important to get rid of all these
poisoned limbs. To prune only half-heartedly usually makes matters worse,
rather than better. When pruning, care should be taken to make smooth
cuts, usually at the base of a branch or limb, so as not to leave any project-
ing stubs. Infection in these stubs is likely to occur when the withertip
fungus is present. Paint the larger cut surfaces with carbolineum or pine tar.
The grove should be given unusual care after a severe pruning of this
kind. It should be fertilized, so as to bring about a vigorous healthy growth,
and to render the trees resistant to further attacks of the fungus.








When to Prune
The best time to prune is from the middle of December to the middle
of January. The second-best time is in July. It is important not to prune
while new growth is putting out vigorously, for this is almost sure to result
in injury. The looks of the trees should not be a primary consideration,
but every part that shows the presence of the disease should be removed.
The beneficial results already obtained on hundreds of acres of groves
treated in this way, under the direction of Experiment Station workers, have
proved the effectiveness of proper pruning.
Cutting Out Useless Trees
In many groves there are individual trees that are useless. They ap-
pear to have a "weak vitality" under the best of treatment, always produce
inferior fruit, or have become so badly diseased that their recovery is hope-
less. Time and money will be saved by cutting them out entirely and
planting healthy and vigorous young trees in their places.


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