Group Title: Research report - West Florida Research and Education Center ; 1999-5
Title: Select cotton cultivar responses to Telone II soil treatment in meloidogyne incognita-infested soil
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Permanent Link: http://ufdc.ufl.edu/UF00053544/00001
 Material Information
Title: Select cotton cultivar responses to Telone II soil treatment in meloidogyne incognita-infested soil
Series Title: Research report
Physical Description: 3 leaves : ; 28 cm
Language: English
Creator: Kinloch, Robert A
Zimet, David J
West Florida Research and Education Center
Publisher: University of Florida, West Florida Research and Education Center
Place of Publication: Jay Fla
Publication Date: 1999]
 Subjects
Subject: Cotton -- Varieties -- Florida   ( lcsh )
Cotton -- Diseases and pests -- Florida   ( lcsh )
Root-knot -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Robert A. Kinloch and D.J. Zimet
General Note: Caption title.
General Note: Series number hand-changed from 4 to 5.
 Record Information
Bibliographic ID: UF00053544
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 62319542

Full Text



U9s-




Sr- Select Cotton Cultivar Responses to Telone II Soil Treatment
in Meloidogyne incognita-infested Soil T E LIBRAR

R. A. Kinloch and D. J. Zimet MAR 2 9 1

University of Florida
West Florida Research and Education Center

Research Report 1999-k

The following study was conducted during 1998 to determine the responses of one susceptible
and two resistant cotton cultivars to the root-knot nematode, Meloidogyne incognita, grown in
soil treated with the Telone II [DowAgrosciences] fumigant nematicide.

A sandy loam field site (82% sand, 10% silt, 8% clay) naturally infested with M incognita on
the Davis' Brothers farm, Santa Rosa County, was disc-cultivated and treated with standard
applications of fertilizer and herbicides (Sprenkel, 1994). The site was demarcated into 36 two-
row plots, 7.2 m long on 0.9 m centers. Each plot was sampled on 1 June to determine its
nematode soil population density by removing eight soil cores (2.54 cm wide X 20 cm deep),
mixing the cores, and processing a 100 cm3 sub-sample via sugar centrifugation (Jenkins, 1964).
Immediately following sampling, Telone II was applied to half of the plots at a rate of 42 liters/ha,
single chisel-injected to a depth of 34 cm. Six replicates each of the cotton cultivars Delta Pine
5415 (susceptible), Stoneville LA 887 (resistant), and Paymaster 1560 (resistant) were planted to
the treated plots and six paired replicates of the same cultivars were planted to the remaining non-
treated plots on 3 June. Planting was accompanied with an application of phorate at 0.8 kg active
ingredient/ha to manage thrips. Plots were maintained with supplemental fertilizer, herbicides,
and insecticides as required. Seed cotton was harvested on 29 October and plots were re-sampled
for soil nematode populations on 3 November.
Pre-treatment soil densities ofM incognita second-stage infective juveniles (J2) averaged
16/100 cm3 soil and there were no significant differences among the plots assigned to the various
treatments (data not presented). Soil fumigation with Telone II significantly (P < 0.007)
improved the yield of the susceptible Delta Pine 5415 and that of the resistant Stoneville LA 887
(P < 0.03) (Table 1). However, fumigation had no influence on the yield of the resistant
Paymaster 1560. The post-harvest J2 soil population density following susceptible Delta Pine
5415 was significantly (P < 0.01) reduced by fumigation while that following Stoneville LA 887
was barely reduced (P < 0.06) (Table 2). Post-harvest J2 soil population density following
Paymaster 1560 was not influenced by soil fumigation. Irrespective of treatment, post-harvest J2
soil population densities following the resistant cultivars were significantly lower than following
the susceptible cultivar.


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The low post-harvest J2 soil population densities and the inability of Telone II to reduce them
indicate the resistant nature of Stoneville LA 887 and Paymaster 1560 to M. incognita. Yield
responses of these cultivars, however, suggest that there is a possible difference in the mode or
level of resistance operating between them. Stoneville LA 887 responded to soil fumigation,
indicating that sufficient J2 penetration may have occurred in this cultivar to influence yields in the
non-treated plots. There was no evidence of this in the neutral response of Paymaster 1560 to
soil fumigation. It is notable that both resistant cultivars yielded as much without Telone II
treatment as did the susceptible cultivar with treatment. Conditions during the crop season were
far from optimal. There was drought through much of the season (Table 3). Yields were much
lower than in an average year. This factor must be considered when evaluating these results.

Literature cited

Jenkins, W. R. 1964. A rapid centrifugal-flotation technique for separating nematodes from soil.
Plant Disease Reporter 48:692.

Sprenkel, R. K. 1996. 1996 Cotton production guidelines. University of Florida Cooperative
Extension Service publication SS-AGR-62. Gainesville, FL.

Table 1. Paired comparisons for yield from cotton cultivars grown in non-treated (0)
Meloidogyne incognita-infested soil and treated (+) with Telone II at 42 liters/ha.

Lint kg/ha t-value

Cultivar 29 October Significance

Delta Pine 5415 (0) 220 4.39

Delta Pine 5415 (+) 294 P < 0.007


Stoneville LA 887 (0) 289 3.0

Stoneville LA 887 (+) 444 P < 0.03


Paymaster 1560 (0) 371 0.18

Paymaster 1560 (+) 361 Not significant
Data are averages of six observations.


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Table 2. Paired comparisons for post-harvest soil nematode population density levels following
cotton cultivars grown in non-treated (0) Meloidogyne incognita-infested soil and treated (+)
with Telone II at 42 liters/ha.

J2/100 cm3 soil t-value

Cultivar 3 November Significance

Delta Pine 5415 (0) 277 3.7

Delta Pine 5415 (+) 135 P < 0.01


Stoneville LA 887 (0) 70 2.4

Stoneville LA 887 (+) 7 P < 0.06


Paymaster 1560 (0) 18 1.5

Paymaster 1560 (+) 2 Not significant
a J2 M. incognita second-stage infective juveniles.
Data are averages of six observations.

Table 3. Weekly rainfall (cm) recorded at the West Florida Research and Education Center
from 1 June to 9 August.


Week 1 2 3 4 5 6 7 8 9 10
1998 1.50 0 0 0.74 1.73 2.49 4.06 2.90 3.20 0.51
1993-97 average 5.20 2.00 5.50 4.70 1.22 7.32 4.95 4.32 5.33 7.80


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