Purple starthistle
C031-04
Purple starthistle timing trial, Novato, 2011-2012
Application date
Product
Milestone
Rate
FALL – 12/14/11 WINTER – 2/1/12 SPRING – 4/5/12
per acre cover % count cover % count cover % count
3 oz
0.1
0.5
0.3
8.0
0.6
0.8
Milestone
7 oz
Capstone
2 qt
--
--
--
Capstone
3 qt
--
--
--
Transline
2/3 pt
0.3
10.5
0.0
untreated
---
32.4
16.4
32.4
0.6
14.3
0.0
0.3
0.2
2.5
--
0.0
0.8
--
0.1
1.0
1.3
0.6
0.5
16.4
32.4
16.4
Purple starthistle timing trial, Lynch Canyon, 2012-2013
Application date
Product
Milestone
Rate
per acre
3 oz
WINTER – 2/22/13 SPRING – 4/24/13
cover % count
cover % count
2.8
12.5
Milestone
7 oz
Capstone
2 qt
--
Capstone
3 qt
--
Transline
2/3 pt
untreated
---
0
0
0.5
2.8
--
0.8
5.5
--
0.6
4.0
0
0
0.6
2.5
20.6
35.5
20.6
35.5
Woolly distaff
thistle
Distaff thistle timing trial, Petaluma, 2011-2012
Product
Milestone
Milestone
Capstone
Capstone
Transline
untreated
Rate
(per acre)
3 oz
7 oz
2 qt
3 qt
2/3 pt
---
Application date
WINTER – 1/12/12
SPRING – 3/21/12
% cover
count
% cover
count
1.95
16.50
0.03
0.25
1.60
6.00
0.00
0.00
----0.00
0.00
----0.00
0.00
3.00
31.00
0.03
0.25
18.83
74.88
January and February were dry in 2012…
Distaff thistle timing trial, Petaluma, 2012-2013
Product
Milestone
Milestone
Capstone
Capstone
Transline
untreated
Rate
(per acre)
3 oz
7 oz
2 qt
3 qt
2/3 pt
---
Application date
WINTER – 1/15/13
SPRING – 4/30/13
% cover
count
% cover
count
3.38
25.00
0.025
0.5
0.025
0.25
0.03
0.25
----1.13
10.50
----0.03
0.25
0
0
0.38
1.25
19.75
55.63
May and June were dry in 2013…
Product
Residual
Good for
Best timing
Milestone
3-6 months Most thistles
Mid to late
winter
Transline
Annual thistles
2-3 months (also good for
purple starthistle)
Late winter
to early
spring
1-2 months Most thistles
Spring
3-6 months Most thistles
Mid to late
winter
(aminopyralid)
(clopyralid)
Capstone
(aminopyralid +
triclopyr)
Perspective
(aminocyclopyrachlor +
chlorsulfuron)
Product
Price / gal
Rate / acre Grazing restrictions
Milestone
$440
7 fluid oz
Transline
$230
⅔ pt
$160 generic
none
$45
2 to 3 qt
none
$80 / lb
2.5 to 5 oz
do not graze
(aminopyralid)
(clopyralid)
Capstone
(aminopyralid +
triclopyr)
Perspective
(aminocyclopyrachlor +
chlorsulfuron)
none
Product
Price / gal
Rate / acre Cost / acre
Milestone
$440
7 fluid oz
Transline
$230
⅔ pt
$160 generic
$18
$13
$45
$22 to $30
(aminopyralid)
(clopyralid)
Capstone
(aminopyralid +
triclopyr)
2 to 3 qt
$24
Late season
control
Product Activity
• No soil residual
• Apply at end of rainy season
• Can be hard to control larger
plants
Price / gal
Rate /
acre
Roundup Nonselective $35
3 qt
(glyphosate)
$25 generic
Broadleaf
$110
Banvel
1 to 2 qt
(dicamba)
plants
$60 generic
2,4-D
LV ester
Broadleaf
plants
$28
Cost /
acre
$27
$18
$27 to $55
$15 to $30
1 to 2 qt $7 to $14
Late season
control
• No soil residual
• Apply at end of rainy season
• Can be hard to control larger
plants
Product
Grazing restriction
Roundup
none (but check label)
Banvel
none for non-lactating animals,
21 to 40 days for dairy
none for non-lactating animals,
7 days for dairy
(glyphosate)
(dicamba)
2,4-D LV ester
Many thistles can
be controlled by
mowing…
 Bud to early bloom
stage
 Reduces seed
production
 For perennials, must
be repeated!
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Seedlings / m2
Yellow starthistle control with burning and Transline
2000
1500
1000
500
0
cal-ipc.org
wric.ucdavis.edu
Useful websites
• WRIC.ucdavis.edu
• IPM.ucdavis.edu
• Cal-IPC.org