Group Title: NFREC Research Report - University of Florida Institute of Food and Agricultural Sciences ; 98-4
Title: Rates of Telone II and Temik 15G to manage reniform nematodes in cotton, 1997
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Permanent Link: http://ufdc.ufl.edu/UF00074383/00001
 Material Information
Title: Rates of Telone II and Temik 15G to manage reniform nematodes in cotton, 1997
Series Title: NFREC research report
Physical Description: 4 leaves : ; 28 cm.
Language: English
Creator: Rich, J. R ( Jimmy Ray ), 1950-
Barber, Stacey K
Kinloch, Robert A
North Florida Research and Education Center (Quincy, Fla.)
Publisher: North Florida Research and Education Center, University of Florida
Place of Publication: Quincy Fla
Publication Date: 1998
 Subjects
Subject: Cotton -- Diseases and pests -- Control -- Florida   ( lcsh )
Nematode diseases of plants -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: J.R. Rich, S.K. Barber, and R.A. Kinloch.
General Note: Cover title.
General Note: "Work conducted with funding assistance from Florida Cotton Growers and Cotton Incorporated."
Funding: Research report (North Florida Research and Education Center (Quincy, Fla.)) ;
 Record Information
Bibliographic ID: UF00074383
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 85615138

Full Text

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FEB 16 1998

University of Florida


RATES OF TELONE II AND TEMIK 15G

TO MANAGE RENIFORM NEMATODES IN COTTON, 1997*



NFREC Research Report 98:4



J. R. Rich, S. K. Barber, and R. A. Kinloch



University of Florida
Route 3, Box 4370
Quincy, FL 32351
(850) 875-7139
rich@gnv.ifas.ufl.edu









*Work conducted with funding assistance from Florida Cotton growers and Cotton

Incorporated.









RENIFORM NEMATODE -COTTON-GADSDEN -1997


The trial reported herein was conducted to determine economic rates of

Telone H and Temik 15G to manage reniform nematode (Rotylenchulus reniformis) in

cotton.



MATERIALS AND METHODS



A cotton field trial was conducted at the University of Florida NFREC, Quincy,

FL in a sandy loam soil (80% sand, 8% silt, 12% clay) infested with the reniform

nematode. The site was previously planted to cotton in 1996 and prepared by moldboard

plowing and double-discing prior to chemical application. Telone II was applied with a

single inrow chisel to 30 cm deep on 6 May, and soil was sealed using a cultipacker.

Temik 15G or Thimet 15G was applied with a Gandy applicator during the planting

operation on 14 May by placing as a 20 cm-wide modified infurrow application. To

balance Temik 15G activity against thrips, Thimet 15G was applied to all plots not

treated with Temik 15G. Cotton cv. DP5415 RR was planted 5-8 cm apart in 91 cm-

wide rows, and individual plots were 2 rows wide x 7.62 m long. The experiment

contained 10 treatments placed in a randomized complete block design with five

replications. Cotton was managed using standard cultural practices and irrigated as

needed.







Cotton was mechanically harvested on 3 December. Lint yield was calculated by

multiplying seed cotton by 0.40, and yield was converted to kg lint/ha. Nematode

populations were collected from control plots before planting and from all plots

postharvest on 15 December. Six soil cores (2.5 cm diam.) to 25 cm deep were removed

from each plot and composite. A 100 cm3 subsample was processed by the modified

centrifugation-flotation method and nematodes counted.



RESULTS



All Telone II treatments produced numerically higher cotton lint yield than

Temik 15G treatments (Table 1). The Telone II at 28 L/ha exhibited highest yield

followed by Telone II at 42 and 14 L/ha. Cotton lint yields were not significantly

differently among the Temik 15G rates or the control plots. Numerically, however, the

5.6, 7.9, and 10.2 kg/ha rates of Temik 15G increased lint yield by over 100 kg/ha

compared to the control plots. The Temik 15G (3.4 kg/ha) and Thimet 15G (control)

produced almost identical yields. A comparison of Temik 15G and Thimet 15G when

used with Telone II at 28 L/ha also showed little differences in lint yield.

Preplant populations of reniform nematode averaged 1205/100 cm3 of soil from

the control plots. At postharvest, population levels were between 2000 and 4000/100 cm3

but no significant differences in populations were found among treatments.







DISCUSSION


Cotton in this trial was well maintained and yields were higher than average

grower production in all treatments. In spite of the good growing conditions resulting

in high yields, nematicide use (primarily Telone II) improved cotton lint yield over the

control. Telone II treatments were more effective in increasing yield than those of Temik

15G. Additionally, no yield advantages were found between Thimet 15G and Temik 15G

(3.4 kg/ha) treatments indicating both were similarly effective for thrips. Cotton yield

increases at the 5.6, 7.9, and 10.2 kg/ha of Temik 15G, however, indicated some

nematode control or suppression at these rates.

Postharvest reniform nematode populations were high and few differences were

found among treatments. These data reflect the ability of reniform nematodes to

recolonize and rapidly reproduce in treated soil zones. Earlier sampling dates appear

to be needed to differentiate nematode population levels among treatments.









Table 1. Comparative dose relationship of Temik 15G and Telone II on cotton in a
field infested with the reniform nematode, 1997.
Rate/ Lint yield Nematodes/
Treatment hectare kg/ha 100 cm3 soil
Telone II 28 L
1293 a' 2298 a
+ Temik 15G 3.4 kg

Telone II 28 L
1256 a 2503 a
+ Thimet 15G 7.5 kg

Telone II 56 L
1236 a 2534 a
+ Thimet 15G 7.5 kg
Telone II 14 L
1192 ab 2536 a
+ Thimet 15G 7.5 kg

Temik 15G 7.9 kg 1169 ab 3052 a

Temik 15G 10.2 kg 1127 ab 3962 a

Temik 15G 5.6 kg 1112 ab 3933 a


Control




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