Virginia Turfgrass Journal - May / June 2014

Page 22

Research Report

Pylex Evaluation for Goosegrass Control and Bermudagrass Safety Virginia Tech Researchers: Jeffrey Derr, Ph.D., Professor of Weed Science, and Adam Nichols, Research Assistant, Hampton Roads AREC, Virginia Beach Research Sponsors: Virginia Turfgrass Council and Virginia Turfgrass Foundation Table 1. Injury to ‘Tifsport’ Bermudagrass Following Single and Repeat Herbicide Applications. z

Trt. No. 1

Treatment Name Nontreated

2

Pylex + MSO

3

Pylex + MSO

4

Pylex + MSO

5

Pylex + MSO

6

Pylex + MSO

7

Pylex + MSO

8 Revolver 9 Acclaim Extra LSD (P = 0.05)

Rate

Application v Timing

4 DATA

Turfgrass Injury (1-9: 1= No Injury, and 4 = Unacceptable injury) 19 DATA 29 DATA 36 DATA 42 DATA 7 DATA 13 DATA w 6 DATC 16 DATC 23 DATC 29 DATC 1.0 d 1.0 d 1.0 e 1.0 f 1.0 f 1.0 f

x

v

1.0 d 0.5 fl. oz./a 0.5 % v/v 0.75 fl. oz./a 0.5 % v/v 1 fl. oz./a 0.5 % v/v 0.5 fl. oz./a 0.5 % v/v 0.75 fl. oz./a 0.5 % v/v 1 fl. oz./a 0.5 % v/v 26 fl. oz./a 28 fl. oz./a

50 DATA 37 DATC 1.0 e

AB

1.4 c

3.1 c

5.3 c

8.3 a

5.0 d

3.0 e

1.8 e

1.0 e

AB

2.0 b

4.0 b

6.0 b

8.3 a

5.8 cd

3.9 d

1.9 e

1.0 e

A

2.9 a

4.8 a

7.3 a

7.5 b

3.9 e

1.4 f

1.0 f

1.0 e

CD

1.0 d

1.0 d

1.0 d

3.5 c

7.0 b

7.6 b

7.0 c

3.1 c

CD

1.0 d

1.0 d

1.0 d

3.0 c

7.6 b

8.5 a

7.6 b

4.3 b

CD

1.0 d

1.0 d

1.0 d

3.5 c

8.5 a

6.4 c

3.0 d

1.5 d

CD CD

1.0 d 1.0 d 0.2

1.0 d 1.0 d 0.2

1.0 d 1.0 d 0.5

1.0 e 2.0 d 0.7

1.0 f 6.1 c 0.8

1.0 f 7.5 b 0.6

1.0 f 8.3 a 0.4

1.0 e 5.0 a 0.3

zTurfgrass injury rated on a 1-9 scale where 1 = no injury, 4 = unacceptable injury, and 9 = complete death. yLetters correspond to the timing and growth stage in the Our Research section. xDATA = Days after treatment A = May 30, 2013. wDATC = Days after treatment C = June 12, 2013. vMeans are the average of four replicates. Means followed by the same letter do not differ significantly according to the Least Significant Difference test (a = 0.05)

Table 2. Goosegrass Control Following Singe and Repat Herbicide Applications. Trt. No. 1

Treatment Name Nontreated

2

Pylex + MSO

3

Pylex + MSO

4

Pylex + MSO

5

Pylex + MSO

6

Pylex + MSO

7

Pylex + MSO

8 Revolver 9 Acclaim Extra LSD (P = 0.05)

Rate

Application z Timing

7 DATA

13 DATA

Goosegrass Control (%) 19 DATA 29 DATA 36 DATA x 6 DATC 16 DATC 23 DATC 0d 0d 3d

42 DATA 29 DATC 1d

50 DATA 37 DATC 1c

v

0b

AB

38 b

88 a

99 a

89 ab

99 a

100 a

98 a

AB

41 b

85 a

95 a

95 a

100 a

90 bc

58 b

A

60 a

86 a

24 bcd

0d

0d

0d

0c

CD

0c

0b

51 b

58 c

90 ab

99 a

100 a

CD

0c

0b

49 b

67 bc

95 ab

100 a

100 a

CD

0c

0b

50 b

68 bc

96 ab

100 a

100 a

CD CD

0c 0c 5

0b 0b 7

18 cd 35 bc 29

68 bc 55 c 24

85 b 48 c 12

96 ab 88 c 6

99 a 91 a 24

0c 0.5 fl. oz./a 0.5 % v/v 0.75 fl. oz./a 0.5 % v/v 1 fl. oz./a 0.5 % v/v 0.5 fl. oz./a 0.5 % v/v 0.75 fl. oz./a 0.5 % v/v 1 fl. oz./a 0.5 % v/v 26 fl. oz./a 28 fl. oz./a

y

zLetters correspond to the timing and growth stage in the Our Research section. yDATA = Days after treatment A = May 30, 2013. xDATC = Days after treatment C = June 12, 2013. w Means are the average of four replicates. Means followed by the same letter do not differ significantly according to the Least Significant Difference test (a = 0.05)


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.