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16

%

14

Percentage d 12 dandeliona c n o 10 cover

October 16, 2009

16/10/2009 October 29, 2009

8

d v e e l r i o n

29/10/2009 November 13, 2009

6 %

4

14 12

d a n d %e l d i a oc n no

2c 10 o 0ve 16 8 Weedy r 14 6w eed y check 12 4 check 80

d v

Fiesta2X F iesta Fiesta1X F iesta Fiesta F iesta 13/11/2009 2X 1X 0.5X

.5X

4

w eed y check

16/10/2009 29/10/2009 13/11/2009

P ar III F iesta 2X F iesta 1X F iesta .5X

14 2

d i c k

0

12 12 % b l 10 a 14 c k

P ar III F iesta 2X F iesta 1X F iesta .5X

2 9 /1 0 /2 00 9

1 6 /1 0 /2 00 9

1 3 /1 1 /2 00 9

2 9 /1 0 /2 00 9 1 3 /1 1 /2 00 9

October 16, 2009

8

8 m 12 % e d b i 6 l c 10 a k c c k 4 o

October 29, 2009

1 6 /1 0 /2 00 9 2 9 /1 0 /2 00 9

6

November 13, 2009

1 3 /1 1 /2 00 9

4

v8 m e e r d 2 i 6 c k 0 c 4 o

2

4

0

2

v e r

9 % n

8a

r r o w 7l e a 6v e d

c p 5l o a v n t e a 4i r n

3

2

Weedy check

w e e d y c he c k

P a r III Par 1

Fiesta 1X

Fiesta 2X

F ie s ta 2 X

F ie s ta 1 X

Fiesta 0.5X

F ie s ta .5 X

9

Figure 2. Fiesta efficacy on black medick.

2 %

0

Percentage % narrow n leaved ar plantain or

1 6 /1 0 /2 00 9

w eed y check

10

6

c o v e r

p l a n t a i n

6

l r i o 14 n 12

b Percentage l 10 a black c medick k 8 m cover e

w l e a v e d

16/10/2009 29/10/2009

1 PPar ar III

10 2 Figure 1. Fiesta efficacy on dandelions.

14 e e

%

13/11/2009

16

8

n 0 a r r o w 9 l c e o8 a v v e e r d 7

w7 e ewde eyd yc che he cckk

9

6

8

5

7

4

P a r III

P a r III

F ie s ta 2 X

F ie s Ftaie s2taX1 X

ieXs ta F ie s taF .5

1X

16/10/2009 29/10/2009 13/11/2009

p 3 l 6 a n 2 tc 5 ao vi 1 ne 4 r

6

16/10/2009 29/10/2009 13/11/2009

5

3

October 16, 2009 October 29, 2009 16/10/2009 November 13, 2009

4

0

3

F ie s ta .5 X

w e e d y c he c k

P a r III

F ie s ta 1 X

F ie s ta 2 X

F ie s ta .5 X

Fiesta 1X

F ie s ta .5 X

29/10/2009 13/11/2009

22

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11 0

0

Weedy check

w e e d y c he c k

P a r III Par 1

Fiesta 2X

F ie s ta 1 X

F ie s ta 2 X

Fiesta 0.5X

Figure 3. Fiesta efficacy on narrow-leaved plantain.

1

delions and black0 medick in the turf canopy that necessary to give season-long control of these w e e d y c he c k P a r III F ie s ta 1 Xweed species. F ie s ta 2 X ie s ta .5 X escaped the first treatment. For Fnarrow-leaved plantain, the current label rate may not give the same per cent Conclusions control as for dandelions and black medick, but The new broadleaf herbicide Fiesta (active the results are still very promising considering ingredient iron in the form of FeHEDTA, 4.43 there are very few alternatives that provide this per cent) has been shown to be efficacious in level of weed control. the control of dandelions, black medick and to a Spring efficacy research in Ontario is lesser degree narrow-leaved plantain during the needed to determine if the results are similar at fall. It appears from this research that coverage that time of year. is important and that all applications should be Acknowledgements: Cameron Wilson, made with a pressurized sprayer to insure good Neudorff Canada for supplying the Fiesta. coverage of the product on the target weeds. For the two targeted weeds in this study, dandelion Pam Charbonneau may be contacted at and black medick, a second application roughly 519-824-4120, ext. 52597, or by e-mail at four weeks after the initial application may be pamela.charbonneau@ontario.ca.

For a catalogue or availability: Tel: (905) 473-1145 Fax: (905) 473-1242 info@caledonhillsperennials.com www.caledonhillsperennials.com

Quality and Selection HORTICULTURE REVIEW - MAY 15, 2010 25


Horticulture Review - May 2010