Group Title: Research report (North Florida Research and Education Center (Quincy, Fla.))
Title: Rates of telone II and temik 15 G to optimize economic return in cotton through management of the southern root-knot nematode.
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Permanent Link: http://ufdc.ufl.edu/UF00066134/00001
 Material Information
Title: Rates of telone II and temik 15 G to optimize economic return in cotton through management of the southern root-knot nematode.
Series Title: Research report (North Florida Research and Education Center (Quincy, Fla.))
Physical Description: 7 leaves : ; 28 cm.
Language: English
Creator: Rich, J. R ( Jimmy Ray ), 1950-
North Florida Research and Education Center (Quincy, Fla.)
Publisher: North Florida Research and Education Center
Place of Publication: Quincy Fla
Publication Date: 1996
 Subjects
Subject: Cotton -- Florida   ( lcsh )
Plant nematodes -- Florida   ( lcsh )
Nematode-plant relationships   ( lcsh )
Genre: non-fiction   ( marcgt )
 Notes
Statement of Responsibility: Jimmy R. Rich ... et al..
General Note: Cover title.
 Record Information
Bibliographic ID: UF00066134
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 71188634

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FEB 0 2 1996

University of Florida




RATES OF TELONE II AND TEMIK 15 G TO OPTIMIZE ECONOMIC RETURN IN
COTTON THROUGH MANAGEMENT OF THE SOUTHERN ROOT-KNOT NEMATODE





NFREC Research Report: 96-4


Jimmy R. Rich,* R. A. Kinloch, Stacey K. Barber, and Robert D.
Hinckle, University of Florida.


*For more information contact: Jimmy R. Rich, Route 3, Box 4370,
Quincy FL. 32351.


L: ...-i Science










Southern Root-knot Nematode-Cotton-Jackson County-1995
The trial reported herein was conducted to determine rates
of Telone II and Temik 15 G for management of the southern
root-knot nematode, Meloidogyne incognita, in cotton.

MATERIALS AND METHODS
A field trial was conducted on a Chipola sandy loam soil
infested with the southern root-knot nematode. The test site was
on the Shane Gardner Farm near Greenwood, FL. The field was
previously planted to cotton in 1994 and was prepared by
moldboard plowing and discing prior to chemical application.
Telone II treatment was made on April 8 with a single inrow
chisel to 12 inches deep. Immediately after application, rows
were bedded to 6 inches high to seal the fumigant. Temik 15 G
and Thimet 15 G were applied infurrow and at planting on April
25, 1995 with a Gandy applicator. Thimet 15 G was applied to all
control and the Telone II plots at planting to reduce thrip
populations. Cotton cv. Chembrand 407 was planted 2-3 inches
apart in 36 inch-wide-rows. Plots were 2 rows wide X 50 feet
long. The experiment contained 9 treatments placed in a
randomized complete block design with 6 replications.
Cotton was managed by the grower utilizing normal cultural
practices. Plants were harvested twice by hand from 25 feet of
each plot row, with the last harvest on Novermber 20, 1995. Lint
yield of cotton was calculated by multiplying seed cotton yield
by 0.40, and yield was converted to lbs. lint/acre. Cotton stalk
* weight was taken from 3 feet of each plot row and converted to
lbs./A.
Six soil cores (1 inch diameter and 10 inches deep) were
taken from each plot on November 20, 1995, combined, and a 6
inch3 soil subsample was processed by the centrifugation-sugar
flotation technique and nematodes counted.

RESULTS
All nematicide treatments and rates significantly improved
yield of cotton compared to the control. Telone II at 3.0 and
6.0 gallons/acre significantly improved cotton yield compared to
the Temik 15 G treatments. No yield differences were found among
rates of Telone II although the high and low rates produced the
highest and lowest lint yield, respectively. No pattern was
found among Temik 15 G rates, and each rate produced about the
same cotton yield. Stalk weights generally mirrored lint yield.
Final populations of the southern root-knot nematode did not
differ among treatments.

DISCUSSION
Telone II at 3.0 to 4.5 gals./A appeared to be optimal rates
under conditions of this test. Differences in cotton yield were
not found among the Temik 15 G rates but all significantly
improved yield over the control. Temik 15 G data may be
confounded somewhat since early season stunting was observed at
the 9 and 12 lbs./A rates. The test will need to be repeated
* using a modified infurrow application of Temik 15 G to help avoid
stunting. This study did not include Telone II plus Temik 15 G










treatment but testing low rates of each in combination may be
useful in further tests.
Low yields in this test was the result of extended drought
periods over the season in this nonirrigated cotton.
Additionally, lower nematode numbers probably reflect the drought
conditions and less than optimal plant growth.










Table 1. Yield of cotton cv. Chembrand 407 and number of
southern root-knot nematode juveniles in a field nematicide test,
1995.1

Lint yield Stalk wt. No. nematodes/
Treatment2 in lbs./A lbs./A 6 inches3 soil

Telone II 6.0 gals. 717 1747 67

Telone II 3.0 gals. 696 1650 38

Telone II 4.5 gals. 644 1244 59

Telone II 1.5 gals. 595 1128 105

Temik 15 G 12.0 lbs. 558 1277 53

Temik 15 G 3.0 Ibs. 550 992 55

Temik 15 G 6.0 lbs. 549 1184 29

Temik 15 G 9.0 lbs. 548 1025 82

Control 404 662 61

LSD (P < 0.05) 124 204 23

1Data are an average of six replicates.
2Application of Telone II was by single chisel injection to 12

inches deep. Temik 15 G and Thimet 15 G applications were made

infurrow at planting. Thimet 15 G was applied to the control and

Telone II treatments.









Reniform Nematode-Cotton-Gadsden County-1995
The trial reported herein was conducted to determine
economic rates of Telone II and Temik 15 G for management of the
reniform nematode, Rotylenchulus reniformis, in cotton.

MATERIALS AND METHODS
A field trial was conducted on a fine sand soil infested
with the reniform nematode. The test site was at the IFAS North
Florida Research and Education Center, Quincy, FL. The field was
previously planted to soybean in 1994. Soil was prepared by
subsoiling and striptilling prior to chemical application.
Telone II treatment was made on March 22 with a single inrow
chisel to 12 inches deep. Immediately after application, rows
were rototilled to seal the fumigant. Temik 15 G and Thimet 15 G
were applied infurrow and at planting on May 8, 1995 with a Gandy
applicator. Thimet 15 G was applied to the control and Telone II
plots at planting to reduce thrip damage. Cotton cv. Chembrand
407 was planted 2-3 inches apart in 36 inch-wide-rows. Plots
were 2 rows wide X 25 feet long. The experiment contained 9
treatments placed in a randomized complete block design with six
replications.
Cotton was managed utilizing normal cultural practices. The
crop was harvested by hand from all plants in the plots on
December 15, 1995. Lint yield of cotton was calculated by
multiplying seed cotton yield by 0.40, and yield was converted to
lbs. lint/acre. Cotton stalk weight was taken from 3 feet of
each plot row and converted to lbs./A. Six soil cores (1 inch
diameter and 10 inches deep) were taken from each plot on
December, 20, 1995, combined and a 6 inch3 soil sample was
processed by the centrifugation-sugar flotation technique and
nematodes counted.

RESULTS
Yield was numerically, but not statistically increased by
all Telone II treatments with the 6.0 gals./A. producing highest
yield. Both yield and stalk weights were generally highest with
the Telone II treatments. All Telone II treatments produced
significantly higher stalk weights than the control. The Temik
15 G treatment of 12 lbs./A produced both lowest lint yield and
stalk weights of all the chemical treatments. This was due to
obvious early season stunting with this high infurrow treatment
rate. Nematode numbers were variable and did not differ among
treatments and the control.

DISCUSSION
Telone II at 3 to 4.5 gals./A appeared to be optimal rates
under conditions of this test. Nematode numbers were initially
low at the beginning of this test thus yield increase due to
chemical treatment was less than if higher initial populations
were present. Higher stalk weights in the Telone II test
compliment field observations that this chemical stimulated
vegetative growth of cotton. This may have reduced lint yield
somewhat, and application of a vegetative growth suppressant may
be useful when using Telone II.










Temik 15 G data may be confounded somewhat since early
season stunting was observed at the 9 and 12 lbs./A rates. The
test will be repeated using a modified infurrow application to
avoid early season stunting of cotton. The study did not include
Telone II plus Temik 15 G treatment, but testing low rates of
each in combination may be useful in further tests.










Table 1. Yield and stalk weight of cotton cv. Chembrand 407 and
number of reniform nematode juveniles at harvest in a field
nematicide test, 1995.1


Lint yield Stalk wt. No. nematodes/
Treatment2 in Ibs./A in lbs./A 6 inches3 soil

Telone II 6.0 gals. 599 6490 5369

Telone II 4.5 gals. 565 6006 4507

Telone II 3.0 lbs. 564 6236 4452

Temik 15 G 3.0 lbs. 550 5397 4763

Temik 15 G 9.0 lbs. 549 5372 4348

Temik 15 G 6.0 lbs. 517 4985 4607

Telone II 1.5 gals. 516 6152 4073

Temik 15 G 12.0 lbs. 514 4922 5411

Control 460 4518 3781

LSD (P < 0.05) 180 1557 2148

1 Data are an average of six replicates.
2 Application of Telone II was by single chisel injection to 12

inches deep. Temik 15 G and Thimet 15 G applications were made

infurrow at planting. Thimet 15 G was applied to the control

and Telone II treatments.


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