Transcript poster huesca 2 - European Weed Research Society

Integrated control of herbicide resistant
Lolium rigidum in extensive rainfed crops
Workshop on Weed management in arid and semi-arid climate
European Weed Research Society
Universitat de Lleida
Dept. de Hortofruticultura,
botànica i jardineria
José Mª Montull and Andreu Taberner
OBJECTIVE
The main objective is to study different alternatives for herbicide-resistant L. Rigidum control in rainfed cereal cropping
systems, integrating three different crops in rotation different herbicides approved for each crop.
MATERIAL & METODS:
Dose
Treatment
timing
B
500g/ha
21BBCH
B
275g/ha
21BBCH
Prosulfocarb 80%
N
4 l/ha
09BBCH
Chlortorluon 50%
C2
4l/ha
11BBCH
Iodosulfuron 0,6%
+mesosulfurón 3%
Florasulam 2,28%
+Pyroxulam 6,83%
Atlantis
Broadway
Auros
Untreated
Clortoluron 50%
Caliban duo
Rainfall
Iodosulfurón 1% +
propoxicarbazone 16,8%
B
330 g/ha
21BBCH
Pinoxaden 10%
A
600cc/ha
13BBCH
Axial
Spring Hussar plus
Barley
Untreated
C2+F
2,5l/ha
11BBCH
B
265g/ha
13BBCH
80
Untreated spring field pea
60
A
1l/ha
21BBCH
Auros
Prosulfocarb 80%
N
4l/ha
09BBCH
Mutual
Imazamox 1,67%
+Pendimetaline 25%
K1+B
3l/ha
09BBCH
Propizamide 40%
K1
1,875l/ha
14BBCH
Fluazifop-P 12,5%
“Strong” A
2l/ha
14BBCH
Tepraloxidim 5%
“Strong “A
2l/ha
14BBCH
Spring
Field Kerb flo
Pea
Untreated
Fusilade Max
Aramo 50
40
20
0
RESULTS:
100
Untreated spring barley
Winter
wheat
a
80
Spring
barley
bc
50
cd
40
de
de
30
ef
fg
Average
Herbicide
Efficaccy (%)
Atlantis
Broadway*
Auros
Clortoluron 50%
Caliban Duo*
Axial
Herbaflex
41,6
55,6
36,1
83,3
63,9
33,3
83,3
Hussar plus*
33,3
10
fg
g
g
fg
fg
* Still unsold in the spanish market
fg
g
Spring field pea
Splendor
CTU
Axial
Hussar
Untreated
Kerb flo
Fusilade max
Aramo 50
Untreated
CTU
Caliban duo
Broadway
Atlantis
Auros
0
Winter wheat
50
50
92,8
85,7
64,3
64,3
35,7
fg
fg
Auros
20
Mutual
efg
2010-2011
Clortoluron 50%
Splendor 40
Auros
Mutual
Spring
Kerb flo
field pea Fusilade Max
Aramo 50
b
60
Untreated
Lolium plants/m2
70
May
Tralkoxidim 40%
April
Splendor 40
March
11BBCH
February
4l/ha
January
C2
December
Chlortoluron 50%
October
Clortoluron 50%
90
120
100
Beflubutamide8,5%
+Isoproturon 50%
Iodosulfuron +
mesosulfuron
Herbaflex
Resistance grade
****
***
**
**
***
*
S
Untreated winter wheat
Spring Barley
Herbaflex
Winter
Wheat
HRAC
Group
Active ingredient
Herbicide
November
Crop
Herbicide
Iloxan
Splendor
Axial
Fusilade-Max
Atlantis
Clortolurón
Auros
CONCLUSIONS:
1.
The effect of sowing in late January has been enough to avoid
applying herbicides against L. rigidum in barley crop.
2.
In this field, low efficacy has been achieved with ALS and ACCase
inhibitors due resistance to these groups of herbicides, including new
herbicides still unsold.
3.
Auros and Kerb efficacy was conditioned by the drought at winter in
the application time.
4.
Only Mutual and Auros in spring pea, have been achieved efficaccy
up to 90%.
5.
90 plants/m2 of L. rigidum in winter wheat justify its control.
6.
15 plants/m2 of L. rigidum in spring barley not justify its control.
7.
8.
9.
10 plants/m2 of L. rigidum in spring pea justify its control.
olium
If this field, infested by a L herbicide resistant biotype, the best
solution was the crop change.