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 Ditera tobacco nematicide test...
 Materials and methods
 Results and discussion






Group Title: Research report - North Florida Experiment Station, University of Florida - 97:9
Title: Use of ditera to manage the Javanese root-knot nematode in Florida flue-cured tobacco
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Permanent Link: http://ufdc.ufl.edu/UF00073726/00001
 Material Information
Title: Use of ditera to manage the Javanese root-knot nematode in Florida flue-cured tobacco
Series Title: NFREC Research report
Physical Description: 4 leaves : ; 28 cm.
Language: English
Creator: Rich, J. R ( Jimmy Ray ), 1950-
Whitty, E. B
North Florida Research and Education Center (Quincy, Fla.)
Publisher: North Florida Research and Education Center
Place of Publication: Quincy Fla
Publication Date: 1997
 Subjects
Subject: Tobacco -- Diseases and pests -- Control -- Florida   ( lcsh )
Root-knot -- Florida   ( lcsh )
Nematode diseases of plants -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Jimmy R. Rich and Elmo B. Whitty.
General Note: Cover title.
Funding: Research report (North Florida Research and Education Center (Quincy, Fla.)) ;
 Record Information
Bibliographic ID: UF00073726
Volume ID: VID00001
Source Institution: Marston Science Library, George A. Smathers Libraries, University of Florida
Holding Location: Florida Agricultural Experiment Station, Florida Cooperative Extension Service, Florida Department of Agriculture and Consumer Services, and the Engineering and Industrial Experiment Station; Institute for Food and Agricultural Services (IFAS), University of Florida
Rights Management: All rights reserved, Board of Trustees of the University of Florida
Resource Identifier: oclc - 84648113

Table of Contents
    Title Page
        Title Page
    Ditera tobacco nematicide test - 1997
        Page 1
    Materials and methods
        Page 1
    Results and discussion
        Page 2
        Page 3
        Page 4
Full Text

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JAN 2 6 1998

University of Florida







USE OF DITERA TO MANAGE THE JAVANESE

ROOT-KNOT NEMATODE IN FLORIDA FLUE-CURED TOBACCO






NFREC Research Report 97: 9


Jimmy R. Rich
University of Florida
Rt. 3, Box 4370
Quincy, FL 32351
850-875-7130


Elmo B. Whitty
University of Florida
304 Newell Hall
Gainesville, FL 32611
352-392-1817


Marston Science
Library









DITERA TOBACCO NEMATICIDE TEST- 1997


The trial reported herein was conducted to determine the efficacy of a biorational

nematicide, DiTera, from Abbott Laboratories to manage the Javanese root-knot nematode

in Florida flue-cured tobacco.



MATERIALS AND METHODS



A field trial was conducted on fine sand soil ( 93% sand, 4% clay, 3% silt ) infested with

the Javanese root-knot nematode ( Meloidogyne javanica). The test site was at the University

of Florida Green Acres farm in Alachua County, and soybean was grown on the site in 1996.

In early March, soil was prepared by moldboard plowing and double-discing. On 31 March,

one Nemacur 3 and four DiTera ES treatments were applied preplant broadcast with a CO2

sprayer containing Teejet 8006 flat fan nozzles. Applications of Nemacur and the DiTera

(28 lbs a.i./A) were made using 56 gallons of water/A. Higher application rates of DiTera were

made by using multiple applications (passes). The materials were then incorporated twice to

3-5" deep with a S-tined rotavator into moist soil. Tobacco rows were 48" wide and plots were

2 rows x 30' long. Treatments were placed in a randomized complete block design with six

replications. Tobacco cv. Coker 371-Gold was transplanted 18" apart in the row two days

after nematicide treatments. Plots were maintained under standard grower conditions and

irrigated as needed. The single postplanting band treatment of DiTera 95 G was applied in 56

gallons of water/A at 39 days after planting. The treatment was applied as a 12" wide directed









DITERA TOBACCO NEMATICIDE TEST- 1997


The trial reported herein was conducted to determine the efficacy of a biorational

nematicide, DiTera, from Abbott Laboratories to manage the Javanese root-knot nematode

in Florida flue-cured tobacco.



MATERIALS AND METHODS



A field trial was conducted on fine sand soil ( 93% sand, 4% clay, 3% silt ) infested with

the Javanese root-knot nematode ( Meloidogyne javanica). The test site was at the University

of Florida Green Acres farm in Alachua County, and soybean was grown on the site in 1996.

In early March, soil was prepared by moldboard plowing and double-discing. On 31 March,

one Nemacur 3 and four DiTera ES treatments were applied preplant broadcast with a CO2

sprayer containing Teejet 8006 flat fan nozzles. Applications of Nemacur and the DiTera

(28 lbs a.i./A) were made using 56 gallons of water/A. Higher application rates of DiTera were

made by using multiple applications (passes). The materials were then incorporated twice to

3-5" deep with a S-tined rotavator into moist soil. Tobacco rows were 48" wide and plots were

2 rows x 30' long. Treatments were placed in a randomized complete block design with six

replications. Tobacco cv. Coker 371-Gold was transplanted 18" apart in the row two days

after nematicide treatments. Plots were maintained under standard grower conditions and

irrigated as needed. The single postplanting band treatment of DiTera 95 G was applied in 56

gallons of water/A at 39 days after planting. The treatment was applied as a 12" wide directed









band spray to the base of tobacco plants and to both sides of the row. Irrigation (0.50") was

applied within 2 hours after the postplant treatment.

Tobacco was observed for phytotoxicity and harvested four times over the season,

cured and weighed. Final harvest was on 28 July and root galling was rated from four plants

in each plot on 13 August. Ratings were on a 0 -10 scale where 0 = no root galling and 10 =

100% of the root system galled.



RESULTS AND DISCUSSION



No early season phytotoxicity was observed with any of the pretransplant treatments.

Also and unlike previous tests, the postplanting application of DiTera did not result in

phytotoxicity. This was due to using the 95G instead of the ES formulation and also avoiding

delivery of the material to active growing points of the plant (buds). Only the Nemacur

treatment significantly improved tobacco yield and reduced root galling over the control plots.

Numerically higher yields, however, were obtained with all DiTera treatments and all root gall

ratings were lower than control plots. Higher yielding treatments generally showed lowest root

gall ratings.

Initial population densities in this test averaged 18 second-stage juveniles per 100 cm3

soil. Pretransplant treatment thresholds for the Javanese root-knot nematode in tobacco can

be as low as three to four juveniles. Population variations (pockets) resulted in some plots

showing wide variations in root galling and yield and subsequently, problems in data analysis

and evaluation.

Data, however, generally indicated a rate response of DiTera with highest yield found









at the 112 lbs. a.i./A. In this test, DiTera showed nematicidal activity and at the high rate used,

similar yield to the Nemacur application at 6.6 lbs. a.i./ A. Positive attributes of DiTera

include it's biorational nature and low mammalian toxicity. Possible negatives may include

high use rates (50-100 lbs a.i./ A) and leaching potential. In particular, leaching of DiTera may

be a problem in the sandy soils of Florida.

Nemacur is recommended in Florida tobacco only as an aid to manage root-knot

nematodes. Similarly, DiTera should be suggested in combination with other integrated

nematode management practices.











Table 1. Cured yield and root galling of tobacco treated with four rates of DiTera in a field infested with the

Javanese root-knot nematode, 1997.



Rate in Yield in Galling
Treatment' lbs. a.i./A lbs./A index2


Nemacur 3 6.6 2245 a4 3.45 a
DiTera ES 112.0 2071 ab 4.40 ab

DiTera ES 56.0 2053 ab 4.70 ab

DiTera ES + 95G 28.0 + 28.03 1869 ab 4.50 ab

DiTera ES 28.0 1780 b 3.65 ab

Control -- 1687 b 5.05 b

'All treatments were applied broadcast and incorporated twice with an S-tine rotavator.

2Root galling indices are an average of four plants in each plot and roots were rated on a 0-10 scale.

3Applied in a 24" band at 39 days after transplanting.

4Column means followed by the same letter are not different (P < 0.05) according to Duncan's Multiple Range test.




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