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Atriplex, Spreading (Atriplex patula L.)

Author: Mike Cowbrough - Weed Management (Field Crops) Program Lead/OMAF
Creation Date: 23 November 2004
Last Reviewed: 23 November 2004

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Table of Contents

  1. History
  2. Life Cycle
  3. Distinguishing Characteristics
  4. Control in Corn
  5. Control in Soybeans
  6. Control in Winter Wheat

History

A native plant prominent throughout Ontario but most abundant in the southern part of the province and along Lake Erie in Haldimand county.

Life Cycle

Annual reproducing only by seed. Will germinate in early spring and flowers in mid-summer until Autumn. One plant can produce between 100 to 6000 seeds.

Distinguishing Characteristics

Often confused with common lamb's-quarters It is distinguished by its prostrate stems, its several pairs of opposite leaves and branches, and its triangular diamond shaped bracts enclosing each flower. For more information, refer to Page 63 in OMAF Publication 505 - Ontario Weeds.

Spreading Atriplex Pictures
Each thumbnail image links to a larger image

Link to a larger photo of Spreading Atriplex Link to a larger photo of Spreading Atriplex Link to a larger photo of Spreading Atriplex

Herbicide Control in Field Corn

Pre-Plant Control

A pre-plant application of glyphosate at 1 L/ac can be effective on spreading atriplex provided the weed is small (less than the 6 leaf stage). However glyphosate does not offer any residual control and therefore the addition of a soil applied residual herbicide will offer adequate season long control (Table1).

Table 1. Season long visual control of spreading atriplex, following pre-plant (PP) applications of various herbicides.
Active Ingredient Trade Name (product rate/acre)
% Control
glyphosate + dicamba/atrazine glyphosate (1 L/ac) + MARKSMAN (High Rate)
90
glyphosate + isoxaflutole/atrazine glyphoate (1 L/ac) + CONVERGE (High Rate)
84
glyphosate + dicamba glyphosate (1 L/ac) + BANVEL II (High Rate)
78
glyphosate glyphosate (1 L/ac)
0
Post Emergent Control

A number of different post-emergent broadleaf corn herbicides will provide over 80% visual control of spreading atriplex. The combination of bromoxynil + atrazine offers the most consistent control of spreading atriplex (Table 2). Alternatively, several of the "one pass" post-emergent herbicide programs in corn provide effective control of spreading atriplex (Table 3).

Table 2. Control of spreading atriplex in field corn using various post-emergent herbicides.
Active Ingredient Trade Name (application timing)
% Control
bromoxynil + atrazine PARDNER or KORIL + atrazine (post)
94
dicamba BANVEL II (post - high rate)
87
prosulfuron/dicamba PEAKPLUS (post)
85
diflufenzopyr/dicamba DISTINCT (post)
82
dicamba/atrazine MARKSMAN (post)
81
primisulfuron/dicamba SUMMIT (post)
75
mesotrione CALLISTO (post)
54
atrazine numerous products exists (post)
19

The combination of bromoxynil + atrazine offers the most consistent control of spreading atriplex

The combination of bromoxynil + atrazine offers the most consistent control of spreading atriplex

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Table 3. Visual control of spreading atriplex with "one-pass" post-emergent herbcide programs in corn.
Active Ingredient Trade Name
% Control
nicosulfuron + diflufenzopyr/dicamba ACCENT TOTAL
98
rimsulfuron+s-metolachlor/benoxacor+dicamba BATTALION
93
nicosulfuron + prosulfuron+dicamba ACCENT 1-PASS
89
nicosulfuron + primisulfuron/dicamba SUMMIT EXTRA
78
foramsulfuron + prosulfuron+dicamba OPTION 35DF + PEAKPLUS
75
Source

Dr. Peter Sikkema, Ridgetown College, University of Guelph.

Number of Trials

Table 1 is based on a summary of 1 field trial.
Tables 2 and 3 are based on a summary of 2 field trials.

Herbicide Rates

Rates used in this trial are listed in OMAF Publication 75 - Guide to Weed Control.

Weed Stage

In two of the field trials spreading atriplex was at the 4-6 leaf stage at application. In the other two trials spreading atriplex ranged from the 4-20+ leaf stage at the time of application.

What has been your experience?

We want your feedback. Let us know what you have experienced with these or other products, as well as any other effective management strategies.

Herbicide Control in Soybeans

Pre-Plant Control

A pre-plant application of glyphosate at 1 L/ac can be effective on spreading atriplex (Table 4) provided the weed is small (less than the 6 leaf stage). However glyphosate does not offer any residual control and therefore the addition of a soil applied residual herbicide will offer adequate season long control (Table 5). It should be noted that the active ingredient metribuzin (i.e. SENCOR) has activity on small emerged spreading atriplex in addition to its residual properties.

Table 4. Visual control of spreading atriplex, following pre-plant (PP) applications of various herbicides.
Active Ingredient Trade Name (product rate/acre)
% Control
glyphosate Numerous Products Exist (2 L/ac)
98
glyphosate Numerous Products Exist (1.5 L/ac)
97
glyphosate Numerous Products Exist (1 L/ac)
96
amitrole AMITROL 240 (3.4 L/ac)
75
amitrole AMITROL 240 (1.7 L/ac)
0

Visual control of spreading atriplex, following pre-plant (PP) applications of of glyphosate at 1 L/ac.

Visual control of spreading atriplex, following pre-plant (PP) applications of of glyphosate at 1 L/ac.

Table 5. Season long control of spreading atriplex with tank-mix application of various soil applied residual herbcides and glyphosate.
Active Ingredient Trade Name(s)
% Control
glyphosate + flumetsulam + s-metolachlor/benoxacor glyphosate + BROADSTRIKE DUAL MAGNUM
99
glyphosate + s-metolachlor/benoxacor + metribuzin glyphosate + BOUNDARY
99
glyphosate + metribuzin glyphosate + SENCOR
99
glyphosate + linuron glyphosate + LOROX
99
glyphosate + imazethapyr/metribuzin glyphosate + CONQUEST
96
glyphosate + imazethapyr glyphosate + PURSUIT
92
glyphosate Numerous Products Exist
62
Post Emergent Control

Post-emergent control of spreading atriplex can be achieved in "Roundup Ready" with split applications of glyphosate (Table 6). However, in conventional soybeans none of the herbicides tested have provided adequate control of spreading atriplex (Table 7). Therefore control of this species with pre-plant and/or residual soil applied herbicides is important in order to achieve effective control.

Table 6. Control of spreading atriplex in "Roundup Ready" soybean.
Active Ingredient Trade Name (application timing)
% Control
glyphosate + glyphosate glyphosate (PP - 1L/ac) + glyphosate (POST - 1L/ac)
99
glyphosate glyphosate (POST - 1L/ac)
74

Table 7. Visual control of spreading atriplex using post-emergent products in conventional soybeans.
Active Ingredient Trade Name
% Control
thifensulfuron-methyl PINNACLE
63
imazethapyr + bentazon CLEANSWEEP
58
bentazon BASAGRAN FORTE
45
Source

Dr. Peter Sikkema, Ridgetown College, University of Guelph.

Number of Trials

Tables 1 and 3 are based on a summary of 1 field trial.
Tables 2 and 4 are based on a summary of 2 field trials.

Herbicide Rates

Rates used in this trial are listed in OMAF Publication 75 - Guide to Weed Control.

Weed Stage

Spreading atriplex ranged from the cotyledon to 10 leaf stage at application.

What has been your experience?

We want your feedback. Let us know what you have experienced with these or other products, as well as any other effective management strategies

Herbicide Control in Winter Wheat

No information at this time. Generally not an issue in fall planted cereals such as winter wheat and winter barley.

What has been your experience?
We want your feedback. Let us know what you have experienced with these or other products, as well as any other effective management strategies.

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