Group Title: Research report (North Florida Research and Education Center (Quincy, Fla.))
Title: Comparative efficacy of telone II applied preplant and atplant on cotton to manage reniform nematodes
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Permanent Link: http://ufdc.ufl.edu/UF00066132/00001
 Material Information
Title: Comparative efficacy of telone II applied preplant and atplant on cotton to manage reniform nematodes
Series Title: Research report (North Florida Research and Education Center (Quincy, Fla.))
Physical Description: 9 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
Place of Publication: Quincy Fla
Publication Date: 1998
 Subjects
Subject: Plant nematodes -- Florida   ( lcsh )
Cotton -- Florida   ( lcsh )
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
 Notes
Bibliography: Includes bibliographical references.
Statement of Responsibility: J. R. Rich, S. K. Barber, and R. A. Kinloch.
General Note: Cover title.
 Record Information
Bibliographic ID: UF00066132
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 71188603

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FEB 6 1998

University of Florida






COMPARATIVE EFFICACY OF TELONE II APPLIED

PREPLANT AND ATPLANT ON COTTON TO

MANAGE RENIFORM NEMATODES*



NFREC Research Report 98:3



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


University of Florida
Route 3, Box 4370
Quincy, FL 32351
(850) 875-7130
rich@gnv.ifas.ufl.edu








COTTON ATPLANT TELONE II 1997


The active ingredient in Telone II, 1,3-dichloropropene (1,3-D), has been

used to successfully control plant-parasitic nematodes in a variety of crops for

over 50 years. Since 1,3-D is phytotoxic to transplants and many direct seeded

crops, use recommendations have included a waiting period of 1-3 weeks after

application for soil dissipation. Little data, however, are available on adverse

effects of 1,3-D (Telone II) applied at planting to cotton.

Two tests were conducted comparing preplant and atplant applications of

Telone II for phytotoxicity and yield in cotton. Test site #1 contained low levels

of plant-parasitic nematodes and was used to measure any phytotoxic effects of

the atplant Telone II treatments. Test site #2 contained damaging levels of

reniform nematodes (Rotylenchulus reniformis) and was conducted to compare

efficacy of preplant and atplant Telone II treatments.



MATERIALS AND METHODS



In 1997, two field trials were conducted at the University of Florida NFREC

near Quincy, FL on a sandy loam soil (80% sand, 8% silt, 12% clay). During the

previous year, test site # 1 was in weed fallow, and test site # 2 was in cotton.

Land preparation at both sites began in late March with moldboard plowing and








then double-discing in early May. Preplant Telone II applications were made on

6 May with a single chisel application to 30 cm deep. The Telone II was sealed

by pressing the soil surface with a small rolling cultipacker. Atplant treatments

were applied similarly on 13 May, and seedbeds of all treatments were lightly

tilled to provide uniformity before planting. Cotton cv. DP5415RR was then

planted 5-8 cm apart in 91 cm-wide rows. Atplanting and infurrow applications

of Temik 15G or Thimet 15G also were included in these tests for thrips control.

Individual plots in the tests were 2 rows wide and 7.62 m long. Treatments were

placed in a randomized complete block design containing 6 replications. Cotton

was maintained using standard recommended growing practices. In test #1,

cotton was not irrigated while in test #2, the crop was irrigated as needed over

the season.

Plants were monitored for phytotoxicity after emergence, and plant stand

was recorded from 1 m of each plot row 34 days after planting. Plant height was

measured from 10 randomly selected plants in each plot 63 days after planting.

Cotton was mechanically harvested on 2 December from both tests, and seed

cotton was converted to lint yield by multiplying by a factor of 0.40. Postharvest

nematode samples were collected 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 technique and

nematodes counted.









RESULTS


Test #1. Phytotoxicity to cotton was not observed among treatments, even at the

highest atplant application rate of 42 L/ha of Telone II. Plant stand was uniform

among chemical treatments and control plots; similarly, plant height of cotton

did not differ among treatments or the control (Table I) No significant yield

differences were found among chemical treatments or the control (Table 2).

Preplant Telone II treatments showed a slight increase in plant stand, plant

height, and yield compared to the atplant applications. Postharvest nematode

numbers were low and not included in these data.

Test # 2. No phytotoxicity was observed among chemical treatments and the

control, and plant stand did not significantly differ among treatments (Table 3).

Plant heights, however, were significantly increased by all chemical treatments.

Plants treated with Temik 15G at 3.9 kg /ha were shortest among treatments but

heights were still significantly greater than the control. Cotton lint yield was

significantly higher in all but two chemical treatments compared to the Thimet

15G control (Table 4). Comparable rates of Telone II atplant or preplant

provided similar yields. Preplant applications of Telone II averaged slightly

greater plant stand, plant height and yield than atplant treatments. Postharvest

populations of reniform nematodes were high, and no significant differences

were found among treatments or the control.








DISCUSSION


The atplant applications of Telone II did not result in cotton phytotoxicity

or reduction in plant stand in either test. In test #1, no differences among plant

height were found among treatments, however in test 2, all Telone II treatments

increased plant height. Plant height differences between the two tests can be

attributed to presence or absence of damaging nematode populations. With

nematode control in test # 2, plant heights were greater in the chemical

treatments, but in test #1, nematode populations were low and not a factor in

plant height. Similarly, yield data in the two tests reflect only small differences

in yield between atplant and preplant Telone II treatments. Main differences

between the two tests were related to nematode control in test #2 which

increased yields. In test # 1, yield data were similar among treatments indicating

no lasting phytotoxicity of the atplant Telone II on cotton.

These tests were conducted in warm moist sandy loam soil and thus

provided good conditions for Telone II dissipation and cotton emergence.

Present data indicated little adverse effects of applying Telone II at planting.

Under less optimal environmental conditions such as cool soils or in heavier soil

types, results of atplant Telone II application could be more adverse through

slower fumigant dissipation and slower cotton seed germination.









Table 1. Plant stand and height of cotton treated with
Telone II in a field trial, 1997 (Test # 1).'


preplant and atplant


Rate/ Stand/ Height (cm)
Treatment hectare m row 10 plants

Telone II 42 L- PP2 10.9 85.2

Telone II 28 L PP 10.6 87.3

Telone II 28 L AP 10.1 84.8

Telone II 14 L AP 10.3 85.5

Control --- 10.5 83.2

Telone II 42 L AP 10.2 82.3

Telone II 14 L PP 11.6 85.5

LSD (P < 0.05) --- 1.3 5.3


'Plant stand counts and height
respectively, after planting on 13


measurements were
May.


taken 34 and 63 days,


2PP indicates preplant application of Telone II, AP is atplant application; rate
given in liters/hectare of formulated product.









Table 2. Yield of cotton treated preplant and atplant with Telone II in a
field trial, 1997 (Test # 1).


Treatment

Telone II

Telone II

Telone II

Telone II

Control

Telone II

Telone II

LSD (P < 0.05)


Rate/
hectare

42 L PP

28 L- PP

28 L -AP

14 L -AP


42 L AP

14L-PP


Lint yield
in kg/ha

663

636

614

591

589

583

596

78


'PP indicates preplant application of Telone II, AP is atplant application; rate
given in liters/hectare of formulated product.









Table 3. Plant stand and height of cotton treated with preplant and atplant
Telone II in a field trial, 1997 (Test # 2).'

Rate/ Stand/ Height (cm)
Treatment hectare m row 10 plants

Telone II 14 L PP2
14.1 79.2
+ Thimet 15G 7.5 kg
Telone II 28 L AP
14.3 77.8
+ Temik 15G 3.9 kg

Telone II 28 L PP
14.5 84.0
+ Temik 15G 3.9 kg

Telone II 14 L AP
14.2 79.5
+ Temik 15G 3.9 kg
Telone II 14 L AP 15
14.5 71.3
+ Thimet 15G 7.5 kg

Telone II 14 L PP
15.7 84.7
+ Temik 15G 3.9 kg
Telone II 28 L PP
15.0 78.0
+ Thimet 15G 7.5 kg
Telone II 28 L AP
14.3 73.7
+ Thimet 15G 7.5 kg

Temik 15G 3.9 kg 14.3 68.0
Control ---
14.0 61.0
+ Thimet 15G 7.5 kg

LSD (P < 0.05) -- 1.9 5.2


'Plant stand counts and heights were taken 34 and 63
planting on 13 May.


days, respectively, after


2PP indicates preplant application of Telone II, AP is atplant application; rates
given in liters or kilograms/hectare of formulated product.









Table 4. Comparison of preplant and atplant application of Telone II on
cotton in a field infested with reniform nematode, 1997 (Test #2).
Rate/ Lint yield Nematodes/
Treatment hectare in kg/ha 100 cm3 soil

Telone II 14 L-PP1
1194 2890
+ Thimet 15G 7.5 kg
Telone II 28 L-AP
1162 3036
+ Temik 15G 3.9 kg

Telone II 28 L-PP 114
1154 2765
+ Temik 15G 3.9 kg

Telone II 14 L-AP
1118 3325
+ Temik 15G 3.9 kg
Telone II 14 L-AP
1105 3723
+ Thimet 15G 7.5 kg
Telone II 14 L-PP
1080 3035
+ Temik 15G 3.9 kg

Telone II 28 L-PP
1051 3683
+ Thimet 15G 7.5 kg
Telone II 28 L-AP
1023 3801
+ Thimet 15G 7.5 kg

Temik 15G 3.9 kg 969 3311
Control ---
895 3366
+ Thimet 15G 7.5 kg

LSD (P < 0.05) -- 122 1354

'PP indicates preplant application of Telone II, AP is atplant application; rate
given in liters or kilograms/hectare of formulated product.




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