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Group Title: Research report - Bradenton Agricultural Research & Education Center - BRA1982-12
Title: Postemergence herbicide screening trial, 1981
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Permanent Link: http://ufdc.ufl.edu/UF00067747/00001
 Material Information
Title: Postemergence herbicide screening trial, 1981
Series Title: Bradenton AREC research report
Physical Description: 3, 2 leaves : ; 28 cm.
Language: English
Creator: Gilreath, J. P ( James Preston ), 1947-
Agricultural Research & Education Center (Bradenton, Fla.)
Publisher: Agricultural Research & Education Center, IFAS, University of Florida
Place of Publication: Bradenton FL
Publication Date: 1982
 Subjects
Subject: Weeds -- Control -- Florida   ( lcsh )
Herbicides -- Testing -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: J.P. Gilreath.
General Note: Caption title.
General Note: "May, 1982."
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Bibliographic ID: UF00067747
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 - 73486252

Table of Contents
    Copyright
        Copyright
    Results
        Page 1
    Conclusions
        Page 2
    Applications conditions
        Page 2
        Page 3
        Page 4
        Page 5
Full Text





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Copyright 2005, Board of Trustees, University
of Florida





Agricultural Research & Education Center
2 University of Florida, IFAS' _
Bradenton, Florida 33508/ U .

Bradenton AREC Research Report BRA1982-12 May 82

POSTEMERGENCE HERBICIDE SCREENING TRIAL 1981 /

J. P. Gilreath Sf Fl rida


Recently a number of new postemergence herbicides have been developed. Among
these are three which are highly selective for grass species in broadleaf crops
and are in two new chemical families of herbicides substituted ethers and
cyclic ketones. In addition to these postemergence grass materials, there are
some relatively new postemergence broadleaf herbicides which may have some
application in vegetable crops. Thus, a screening trial was conducted in the
fall of 1981 to evaluate these postemergence herbicides on grass and broadleaf
weeds at the Agricultural Research and Education-Bradenton. The herbicide
treatments are listed in Table 1. All treatments were applied with a CO2 back
pack plot sprayer fitted with four 11004 teejet nozzles and operated at a speed
of 3 mph and 28 lbs/sq in. of pressure for an output of 26.6 gal/A. Table 2
lists the experimental methods and conditions relevant to this experiment. Table 3
lists crop cultivars and plant spacings used in the trial along with the size of
the crop plants at time of application of the treatments. Table 4 lists the
weed species and stage of growth at time of treatment application.

RESULTS

Crop Phytotoxicity Fusilade Poast and RO-138895 (grass herbicides) were not
appreciably phytotoxic to any of the crops tested, except sweet corn (Table 5).
Collard and cauliflower did exhibit some decrease in vigor when treated with
0.3 lb/A Poast and 0.25 lb/A RO-138895. The various rates of RH 0265 and Blazer
all show some degree of phytotoxicity to the screening crops, including sweet corn.
In general these levels of vigor reduction were commercially unacceptable.
Basagran applied with and without Agridex crop oil was generally less phytotoxic
than RH 0265 or Blazer. Differences between spray preparations with and without
Agridex oil were not as great as between rates. Crops with acceptable levels
of tolerance to Basagran were tomato, snapbean, southern pea, cucumber, watermelon,
corn and sunflower.

Weed Control Fusilade, Poast and RO-138895 provided excellent control of both
growth stages of crabgrass and goosegrass at the rates evaluated, except 0.125 and
0.25 lb a.i./A. Fusilade did not provide acceptable control of crabgrass at the
6-8 leaf stage of development (Table 6). None of these three herbicides controlled
broadleaf weeds. All rates of RH 0265 and Blazer completely controlled carpetweed
and offered acceptable to good control of pigweed and Rorippa. Consistently
acceptable control of the remaining broadleaf species was not obtained with these
materials. Both rates of Basagran with and without oil provided acceptable control
of Rorippa, while only the high rate of Basagran, with and without oil, controlled
lambsquarters. Pigweed was effectively controlled with 1 Ib a.i./A Basagran
plus oil. The only treatments to control annual sedge were all rates of Basagran
with and without oil.


1Mention of a specific herbicide does not constitute or imply a recommendation or
endorsement by the author or the University of Florida.
Dr. James P. Gilreath is Assistant Professor of Horticulture (Weed Science) at the
University of Florida, IFAS, Agricultural Research & Education Center, 5007-60th
Street East, Bradenton, FL 33508.





-2-


CONCLUSIONS

Based on crop vigor ratings and control of crabgrass and goosegrass, Fusilade,
Poast and RO-138895 hold considerable promise for postemergence grass control in
the broadleaf vegetables used in this non-replicated experiment. RH 0265 and
Blazer appear too phytotoxic to the crop plants used in this study. Basagran
would be acceptable for broadleaf weed control in some vegetable crops. As a
result of this screening study Fusilade and Poast will be included in future
replicated field herbicide trials on a number of vegetable crops.


Table 1. List of treatments in herbicide screening trial. Fall 1981. Bradenton, FL

No. Treatment Rate (lb a.i./A) No. Treatment Rate (lb a.i./A)

1 Fusilade + oilz 0.125 + 1 qt 10 Blazer 2S 0.50
2 Fusilade + oil 0.25 + 1 qt 11 Blazer 2S 0.75
3 Fusilade + oil 0.50 + 1 qt 12 Basagran 0.50
4 RH 0265 + AG98 0.06 + 1/8% v/v 13 Basagran 0.75
5 RH 0265 + AG98 0.09 + 1/8% v/v 14 Basagran + oil 0.75 + 1 qt
6 RH 0265 + AG98 0.12 + 1/8% v/v 15 Basagran + oil 1.0 + 1 qt
7 RH 0265 + AG98 0.25 + 1/8% v/v 16 Poast + Atplus 0.3 + 1 qt
8 Blazer 2S 0.25 17 RO-138895 + X-77 0.25 + 1% v/v
9 Blazer 2S 0.38 18 Check

ZCrop oil used was Agridex.


Table 2. Experimental methods and conditions in herbicide screening trial.
Fall, 1981. Bradenton, FL.
EXPERIMENT Herbicide screening Post emergence materials
LOCATION Bradenton AREC, Bradenton, FL SEASON Fall YEAR 1981
VARIETY Multiple crops ROW WIDTH 4.5 ft.
PLOT SIZE 12 ft 2 rows/plot PLANT SPACING/SEEDING RATE variable/see Table 3
DATE PLANTED 11 Sept. 81 SOIL TYPE/& pH Myakka fine sand; 6.5
EXPERIMENTAL DESIGN Screening REPS 1
APPLICATIONS CONDITIONS
APPLICATION TIME Postemergence WEATHER
(to crops & weeds) Sky conditions clear
Type & Date 9 Oct. 81 Air temperature 870F
Time of Day 2 PM Soil temperature 930F
Relative humidity 44%
EQUIPMENT CO back pack Wind calm
Nozzle tips ll04 teejet Soil moisture field capacity
Volume 26.6 gal/A Rainfall after
Pressure 28 lbs/sq in. application none for 2 wks
Speed 3 mph
COMMENTS: 10 Sept. 81 1000 #/A of 6-6-6 with FTE 503 + 1000 #/A dolomite


25 Aug. 81

16 Oct. 81
19 Oct. 81


applied preplant and incorporated
- Fumigated with EDB 6 gal/A
Fungicides and insecticides applied as needed
- Evaluated for phytotoxicity
- Evaluated for weed control





-2-


CONCLUSIONS

Based on crop vigor ratings and control of crabgrass and goosegrass, Fusilade,
Poast and RO-138895 hold considerable promise for postemergence grass control in
the broadleaf vegetables used in this non-replicated experiment. RH 0265 and
Blazer appear too phytotoxic to the crop plants used in this study. Basagran
would be acceptable for broadleaf weed control in some vegetable crops. As a
result of this screening study Fusilade and Poast will be included in future
replicated field herbicide trials on a number of vegetable crops.


Table 1. List of treatments in herbicide screening trial. Fall 1981. Bradenton, FL

No. Treatment Rate (lb a.i./A) No. Treatment Rate (lb a.i./A)

1 Fusilade + oilz 0.125 + 1 qt 10 Blazer 2S 0.50
2 Fusilade + oil 0.25 + 1 qt 11 Blazer 2S 0.75
3 Fusilade + oil 0.50 + 1 qt 12 Basagran 0.50
4 RH 0265 + AG98 0.06 + 1/8% v/v 13 Basagran 0.75
5 RH 0265 + AG98 0.09 + 1/8% v/v 14 Basagran + oil 0.75 + 1 qt
6 RH 0265 + AG98 0.12 + 1/8% v/v 15 Basagran + oil 1.0 + 1 qt
7 RH 0265 + AG98 0.25 + 1/8% v/v 16 Poast + Atplus 0.3 + 1 qt
8 Blazer 2S 0.25 17 RO-138895 + X-77 0.25 + 1% v/v
9 Blazer 2S 0.38 18 Check

ZCrop oil used was Agridex.


Table 2. Experimental methods and conditions in herbicide screening trial.
Fall, 1981. Bradenton, FL.
EXPERIMENT Herbicide screening Post emergence materials
LOCATION Bradenton AREC, Bradenton, FL SEASON Fall YEAR 1981
VARIETY Multiple crops ROW WIDTH 4.5 ft.
PLOT SIZE 12 ft 2 rows/plot PLANT SPACING/SEEDING RATE variable/see Table 3
DATE PLANTED 11 Sept. 81 SOIL TYPE/& pH Myakka fine sand; 6.5
EXPERIMENTAL DESIGN Screening REPS 1
APPLICATIONS CONDITIONS
APPLICATION TIME Postemergence WEATHER
(to crops & weeds) Sky conditions clear
Type & Date 9 Oct. 81 Air temperature 870F
Time of Day 2 PM Soil temperature 930F
Relative humidity 44%
EQUIPMENT CO back pack Wind calm
Nozzle tips ll04 teejet Soil moisture field capacity
Volume 26.6 gal/A Rainfall after
Pressure 28 lbs/sq in. application none for 2 wks
Speed 3 mph
COMMENTS: 10 Sept. 81 1000 #/A of 6-6-6 with FTE 503 + 1000 #/A dolomite


25 Aug. 81

16 Oct. 81
19 Oct. 81


applied preplant and incorporated
- Fumigated with EDB 6 gal/A
Fungicides and insecticides applied as needed
- Evaluated for phytotoxicity
- Evaluated for weed control













Table 3. Crop cultivar, plant spacing and size or growth stage of plant at time of
postemergence herbicide application. October 9, 1981. Bradenton, FL.
Size of plant at
No. Crop Cultivar Plant spacing application

1 Tomato Hayslip 1 foot 1 ft 10 leaf
2 Cabbage Conquest 1 foot 8-10 leaf
3 Snapbean Sprite 2-3 inches 10 inches 6 leaf
4 Southern pea Blackeye No. 5 2-3 inches 1 ft 6 leaf
5 Collard Georgia L. S. 8 inches 8 leaf
6 Cucumber Poinsett 8 inches 2 ft 7 leaf
7 Watermelon Charleston Gray 1 foot 2 ft 7 leaf
8 Squash Early Yellow Summer
Crookneck 6 inches 10 inches 6 leaf
9 Okra Clemson Spineless 6 inches 13 inches
10 Corn Silver Queen 6 inches 15 inches
11 Radish Red Prince 2 inches 6-8 leaf
12 Sunflower MCF-700 10 inches 14 inches
13 Cauliflower Early Snowball A 1 foot 8 leaf
14 Broccoli Atlantic 1 foot 6 leaf




Table 4. List of weed species and stage of growth at time of treatment in
herbicide screening trial. Fall 1981. Bradenton, FL.

List of Weed Species

No. Common Name Scientific Name Size at time of treatment

1 Crabgrass Digitaria ciliaris 6-8 leaf stage
2 Goosegrass Eleusine indica 6-8 leaf stage
3 Crabgrass D. ciliaris 2-4 leaf stage
4 Goosegrass E. indica 2-4 leaf stage
5 Carpetweed Mollugo verticillata 3-5 true leaves
6 Slender pigweed Amaranthus viridis 4 true leaves
7 Rorippa teres 3-5 true leaves
8 Lambsquarters Chenopodium album 4 true leaves
9 Yerba-de-tago Eclipta alba 4 true leaves
10 Hedyotis corymbosa 4 true leaves
11 Annual sedge Cyperus compressus 2-6 leaf stage





Table 5. Influence of postemergence herbicide treatment on crop vigor. Octc
CROI
TRT RATE Crop No.
NO. TREATMENT (lb a.i./A) 1 2 3 4 5 6 7

1 Fusilade + oily 0.125 + 1 qt. 10 10 10 10 10 10 10


Fusilade + oil

Fusilade + oil

RH0265 + AG98

RH0265 + AG98

RH0265 + AG98

RH0265 + AG98

Blazer 2S

Blazer 2S

BJazer 2S

Blazer 2S

Basagran

Basagran

Basagran + oil

Basagran + oil

Poast + Atplus

RO-138895 + X-77


18 Check


0.25 + 1 qt.

0.50 + 1 qt.

0.06 + 1/8% v/v

0.09 + 1/8% v/v

0.12 + 1/8% v/v

0.25 + 1/8% v/v

0.25

0.38

0.50

0.75

0.50

0.75

0.75 + 1 qt.

1.0 + 1 qt.

0.3 + 1 qt.

0.25 + 1% v/v


10 10 10 10

9 10 9 10


9 10 10

9 10 10


6 0 5 5 0 3 3


6 1 5 5 0

5 1 4 4 o
4 0 3 3 0

6 2 5 5 4

4 0 3 3 0

6 2 5 5 0

4 0 3 3 0

8 2 9 9 2

7 0 9 9 4

7 0 9 9.5 4

8 0 9 9 4

9 10 10 10 6

9 10 9 9 7

10 10 10 10 10
10 10 10 10 10


S0 0


0 1

0 1

0 2

0 0

1 0

0 0

8 8

8 7

7 7

6 7

8 9

8 9


)ber 16, 1981. Bradenton, FL.
VIGORz
(See Table 3)


8 9 10 11 12 13 14

10 9.5 5 10 10 9 9

9.5 9 4 10 10 8 9

9 9 2 10 10 8 9

0 6 7 o 4 4 7

0 3 7 0 3 2 4

1 2 6 0 2 1 4

1 1 5 0 1 1 4

0 5 5 0 5 1 4

0 3 4 0 3 1 3

0 3 4 0 3 0 0

0 1 3 0 2 0 0

6 5 9 6 7 5 4

6 5 10 5 6 4 2

6 7 10 5 9 4 3

6 6 10 0 8 0 2

8 9 5 10 9 7 8

9 9 2 10 10 8 8


9 10 9.5 9.5 10 10 10


Z~jor:10 o ijur; 0= dad.Jcrp ol uei as griiex


9 9


zVigor: 10 = no injury; 0 = dead.


YCrop oil used was Agridex.












Table 6. Influence of postemergence herbicide treatment on weed control.
October 19, 1981. Bradenton, FL.
WEED CONTROL
TRT RATE Weed Species No. (See Table 4)
NO.X TREATMENT (lb a.i./A) 1 2 3 4 5 6 7 8 9 10 11


Fusilade + oily

Fusilade + oil

Fusilade + oil

RH0265 + AG98

RH0265 + AG98

RH0265 + AG98

RH0265 + AG98

Blazer

Blazer

Blazer

Blazer

Basagran

Basagran

Basagran + oil

Basagran + oil


0.125 + 1 qt. 4

0.25 + 1 qt. 7

0.50 + 1 qt. 9

0.06 + 1/8% 0

0.09 + 1/8% 0

0.12 + 1/8% 0

0.25 + 1/8% 0

0.25 1

0.38 2

0.50 0

0.75 2

0.50 0

0.75 0

0.75 + 1 qt. 0

1.0 + 1 qt. 0


Poast + ATPLUS 0.3 + 1 qt.

RO 138895 + X-77 0.25 + 1%


8 9 0 0

8 10 0 0

9 10 0 0


0 0 0 10 7


0

0

0

7


0 10 7 7

1 10 7 7

1 10 8 8

1 10 9 9

3 10 10 10

3 10 9 9

4 10 9 10

o 4 3 7

0 2 2 7

0 0 5 7

0 0 8 7
0087


9 9 9 10 0 0 0

10 10 10 10 0 0 0


0

0

0

0

0

1

2

2

3

2

3

3

8

4

8

0

0


18 Check


0 0 0 0 0 0


0 0 0 0 0


'Weed control rating made on a 0 to 10 scale where 0 = no control and 10 = complete
control.
Ycrop oil used was Agridex.
XTreatments 4 through 11 produced varying degrees of foliar scorch on grasses of a
contact nature; no evidence of translocation




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