Group Title: Press bulletin
Title: Tomato seed-beds--spraying of
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 Material Information
Title: Tomato seed-beds--spraying of
Series Title: Press bulletin
Physical Description: 2 leaves : ; 21 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: 1906
Subject: Tomatoes -- Seedlings -- Protection -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
Statement of Responsibility: by H.S. Fawcett.
General Note: Caption title.
General Note: "October 20, 1906."
 Record Information
Bibliographic ID: UF00090408
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 - 80696301

Full Text


Florida Agricultural Experiment Station



Young tomato plants in seed-beds are frequently quite
seriously injured by "rust" due to a fungus known as
Alternaria solani. This may be prevented successfully by
thoroughly spraying the seedlings with Bordeaux mixture.
The fungus lives on the surface and in the interior of the leaf,
forming at first mere dots, which later enlarge to brown,
irregular, rusty looking areas. In moist weather the rusty
areas may assume a velvety appearance due to the development
of numerous spores.
Preventive measures are the only practicable means that
can be employed in combating tomato rust and similar diseases.
Spraying the seedlings in the seed-bed is a preventive meas-
ure, and its importance may readily be understood from the
following considerations:
1. When the fungus is just starting on the surface, before
it has entered the leaf, it can be easily killed, but after it has
once entered the leaf tissue and formed the rusty spot it con-
tinues to grow internally and enlarge the spot even when the
leaf is covered with Bordeaux mixture. Bordeaux mixture is
of value in this case, not in curing spots already formed, but in
preventing other spots from forming.
2. When the seedlings have become infected with rust in
the seed-bed, it is transferred with the plants to the field, where
it continues to do much damage. The rusty areas enlarge and
the infection spreads until the plants are very materially
injured. The disease is also much harder to combat in the field
because of the larger area to be sprayed.

Octber 20, 1906.

It is therefore highly important that the seed-beds should
be thoroughly sprayed even before any sign of the rust appears.
The first spraying should be done as soon as the first leaf is
well formed. The frequency of spraying necessary to prevent
rust depends on conditions of weather and moisture. It should
probably vary from twice a week in moist, rapidly-growing
weather to once a week or once in ten days in drier, cooler
weather. Bordeaux mixture of the formula: 3 pounds copper
sulphate and 3 pounds of rock lime to 50 gallons of water has
proven as successful as a stronger solution in preventing the
rust. See Bulletin 76, page 238 of the Florida Agricultural
Experiment Station, for directions in making Bordeaux
Spraying seed-beds with Bordeaux mixture in addition to
preventing "rust," will also prove beneficial in preventing
infection of other fungi such as "leaf mould" (Cladosporium
In case of "damping off," which is due to certain fungi and
not to bites of insects as is often supposed, the bed should be
worked up to make the surface soil dry and loose, and should
be sprayed with an ammoniacal solution of copper carbonate,
the formula for which is: 5 ounces of copper carbonate, 3
pints of ammonia of 26 degrees strength to 50 gallons of water.
See Bulletin 76; page 239 of Florida Agricultural Experiment
Station, for directions for preparation of this fungicide.

State papers please copy.

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