Group Title: Indian River Field Laboratory mimeo report
Title: An evaluation of sprayed chemicals for control of bacterial spot, gray leaf spot and late blight of tomato
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Permanent Link: http://ufdc.ufl.edu/UF00056007/00001
 Material Information
Title: An evaluation of sprayed chemicals for control of bacterial spot, gray leaf spot and late blight of tomato
Series Title: Indian River Field Laboratory mimeo report
Physical Description: 3 leaves : ; 28 cm.
Language: English
Creator: Stall, Robert E
Indian River Field Laboratory
Publisher: Indian River Field Laboratory
Place of Publication: Fort Pierce Fla
Publication Date: [1963]
 Subjects
Subject: Tomatoes -- Diseases and pests -- Control -- Florida   ( lcsh )
Genre: non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Robert E. Stall.
General Note: Caption title.
General Note: "May 8, 1963."
 Record Information
Bibliographic ID: UF00056007
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 69242714

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Copyright 2005, Board of Trustees, University
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Indian River Field Laboratory Mimeo Report 63-1


AN EVALUATION OF SPRAYED CHEMICALS FOR CONTROL OF BACTERIAL SPOT,
GRAY LEAF SPOT ANfD LATE BLIGHT OF TOMATO


Robert E. Stalli/


Each year new fungicides and bactericides are compared with standard
materials for control of the most common diseases of tomato in the Indian River
Area. Results of tests completed during the 1962-63 season are presented in
this mimeo report.

Bacterial spot.--Experimental materials were evaluated for control of
bacterial spot of tomato caused by Xanthomonas vesicatoria (Doidge) Dows
after spraying single rows of field-seeded Manapal variety seedlings in a fall
1962 test. Treatments were randomized in blocks with 4 replicates. Materials
were applied with a power sprayer which delivered 75 to 125 gallons of spray
per acre depending on plant size, at 300 psi. The first sprays were applied
5 days after emergence and twice weekly thereafter until eleven applications
had been made. The average number of lesions per leaflet was determined from
25 random leaflets collected from each replicate of a treatment. The data are
presented in Table 1.

Plants in buffer rows between treatment rows Were inoculated with an isolate
of the bacterial spot organism susceptible to 100 ppm streptomycin. Apparently
only these susceptible bacteria became established in the plots, since the copper
plus 400 ppm streptomycin treatment resulted in excellent protection. This was
not true in past trials when streptomycin resistant bacteria were predominant
in the plots.


Table 1. Data on control of bacterial soot with
sprays. October 19, 1962.


various chemicals applied as


Duncan' s
Lesions Multiple Toxicity
Chemical and rate of use per Range test to
per 100 gallons leaflet 0.01 levela/ tomato
Phelps Dodge Tri-basic Gopper Sulfate (4 lbs.) +
AS-17 (400 ppm) 0.3 a -
Bayer 45112 (1.6) 149 a slight
Bayer 45112 (0.8) 65 b -
Phelps Dodge Tri-basic Copper Sulfate (4 lbs.) 8.7 bc -
Wettable Sulfur (6 lbs.) 9.0 bc -
Morton EP-213 (0.75 lb.) 10.1 c severe
General Chemical 3521 (1 lb.) 10.5 c -
Tennessee Tri-basic Copper Sulfate (4 lbs.) 11.1 c -
Morton EP-214 (1.5 lbs.) 11.4 c -
Check 11.9 c -


a/ Treatments having same letter are not significantly different.

1/ Assistant Plant Pathologist, Indian River Field Laboratory, Ft. Pierce, Florida.


May 8, 1963


~ u? ~ -,





-2-


Gray leaf spot.--Fungicides were compared for control of gray leaf spot of
tomato caused by Stemphylium solani Weber in a spring 1962 test. Treatments
were sprayed on single rows of Homestead-24 variety plants and were randomly
arranged in 4 replicates. A tractor drawn power sprayer was used to apply from
125 to 225 gallons of spray per acre depending on plant size, at 300 psi. Four-
teen applications of each treatment were made on a 4 5 day schedule. The
average number of lesions per leaflet was determined from 25 comparable leaflets
from each replicate of a treatment. Data are presented in Table 2.


Table 2. Data on control of gray leaf spot with
sprays. May 15, 1962.


Chemical and rate of use
per 100 gallons
Manzate (1 lb.) + Dyrene (1 lb.)
Manzate (1.5 lb.)
Dithane M-45 (1.5 lb.)
Niagara 9102 (1.5 lb.)
Naugatuck B-720 (2 lb.)
Niagara 5619 (1.5 lb.)
General Chemical G-6777 (2 lb.)
General Chemical G-6778 (2 lb.)
Diamond DAC-1200 (2 lb.)
Nabac-EC 25 (1 pt.)
Check
Manzate (1 lb.) + Botran (1 lb.)


various chemicals applied as


Lesions
per
leaflet
1.7
2.0
3.6
5.5
8.4
9.6
11.1
14.3
20.6
a


Duncan's
Multiple
Range test
0.01 level/
a
a
ab
abc
bc
bcd
cd
d
e


a/ Plants were defoliated.

b/ Plants were not rated because of severe toxicity.

c/ Treatments having same letter are not significantly different.


Toxicity
to
tomato
-


-




slight


severe
-
seer


_ __ __


I









Late blight.--In a spring 1963 test, fungicides were evaluated for control of
late blight caused by Phytophthora infestans (Mont.) DBy. Treatments were sprayed
on single rows of Homestead-2h tomato plants which were separated by a buffer row
of plants. Treatments were arranged in a replicated block design with 4 replicates,
A tractor drawn power sprayer was used to apply from 125 to 225 gallons of spray
per acre defending on plant size, at 300 psi. During the test plants were sprayed
13 times oh a weekly schedule. The per cent defoliation by late blight was es-
timated and data are presented in Table 3.



Table 3. Data on control of late blight of tomato with various chemical fungicides
applied as sprays. Aoril 4, 1963.


Chemical and rate of use
per 100 gallons
Dithane M-22 (1.5 lbs.)
Bayer 47531 (2 lbs.)
Bayer 46131 (1.5 lbs.)
Dithane M-22 (1 lb.) + Dyrene (1 lb.)
Dithane M-h4 (1.5 lbs.)
Niagara 9102 (1.5 lbs.)
Cal-Spray Difolatan (2 lbs.)
Geigy Ga-10 (4 lbs.)
General Chemical 3521 (1 lb.)
No treatment
Stauffer M-37 (2 lbs.)
Dithane M-22 (1 lb.) + Botran (1 lb.)


Late blight
rating
(% defoliation)
3.5
---^---
5.0
6.0
7.0
8.8
20.0
33.3
37.5
85.0
85.0
a/
A t/


Duncan's
Multiple
Range test
0.01 levels/
a
a
a
a
a


Toxicity
to
tomato


chlorosis






severe
severe


a/ Plants not rated because 6f severe toxicity.

b/ Treatments having same letter are not significantly different,















IRFL 63-1
250 copies




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