Weed control, environmental impact and profitability of reduced rates of imazethapyr in combination with dimethenamid in dry beans

2007 ◽  
Vol 87 (3) ◽  
pp. 671-678 ◽  
Author(s):  
N. Soltani ◽  
L. L. Van Eerd ◽  
R. J. Vyn ◽  
C. Shropshire ◽  
P. H. Sikkema
Keyword(s):  
Phaseolus Vulgaris ◽  
Environmental Impact ◽  
Weed Control ◽  
Field Experiments ◽  
Amaranthus Retroflexus ◽  
Ambrosia Artemisiifolia ◽  
Kidney Bean ◽  
Phaseolus Vulgaris L ◽  
Profit Margins ◽  
Kidney Beans

Field experiments were conducted from 2003 to 2005 in Ontario to determine if reduced rates of imazethapyr (< 75 g a.i. ha-1) tank-mixed with dimethenamid applied preemergence (PRE) can be used as a feasible weed management strategy for broad-spectrum weed control in white and kidney beans (Phaseolus vulgaris L.). There was no injury in white or kidney bean with the imazethapyr plus dimethenamid tank-mix treatments evaluated. The rate of imazethapyr required to provide adequate control of green foxtail [Setaria viridis (L.) P. Beauv.], lamb’s-quarters (Chenopodium album L.), common ragweed (Ambrosia artemisiifolia L.), wild mustard (Sinapis arvensis L.), and redroot pigweed (Amaranthus retroflexus L.) tended to be reduced when tankmixed with dimethenamid at 1000 g ha-1. There was no adverse effect on the yield of white and kidney beans at the highest rate (75 g a.i. ha-1) of imazethapyr evaluated. Although both herbicides are considered reduced risk, the environmental impact of imazethapyr (75 g a.i. ha-1) was seven times less than that of dimethenamid (1000 g a.i. ha-1). The addition of reduced rates of imazethapyr to dimethenamid did not significantly increase environmental impact (EI) vs. dimethenamid alone. Profit margins were greater when dimethenamid was tank-mixed with imazethapyr than for applications of imazethapyr alone. Across all treatments, profit margins were maximized at an imazethapyr rate of 60 g a.i. ha-1 for white bean and an imazethapyr rate of between 60 and 75 g a.i. ha-1 for kidney bean. However, the profit-maximizing rates of imazethapyr tended to be higher for treatments without dimethenamid than for treatments where dimethenamid was tank-mixed with imazethapyr. Key words: Dimethenamid, environmental impact quotient (EIQ), imazethapyr, Montcalm, OAC Thunder, Phaseolus vulgaris L., profit margin

scholarly journals Effect of reduced herbicide rates on weed control, environmental impact and profitability of corn

2009 ◽  
Vol 89 (5) ◽  
pp. 969-975
Author(s):  
Nader Soltani ◽  
Richard J Vyn ◽  
Laura L Van Eerd ◽  
Christy Shropshire ◽  
Peter H Sikkema
Keyword(s):  
Zea Mays ◽  
Environmental Impact ◽  
Zea Mays L ◽  
Chenopodium Album ◽  
Amaranthus Retroflexus ◽  
Ambrosia Artemisiifolia ◽  
Corn Yield ◽  
Profit Margins ◽  
Profitability Analysis ◽  
Biomass Reduction

A study was conducted over a 3-yr period (2003, 2004, and 2005) to evaluate the effect of reduced herbicide rates - 20, 40, 60, 80, and 100% of the manufacturer’s recommended rate (MRR) - on weed biomass reduction, environmental impact (EI), yield, and profitability of corn (Zea mays L.) in Ontario. The herbicide rate required to provide 95% biomass reduction of velvetleaf (Abutilon theophrasti Medic.), redroot pigweed (Amaranthus retroflexus L.), common ragweed (Ambrosia artemisiifolia L.), common lambsquarters (Chenopodium album L.), and annual grasses was 92, 30, 41, 28, and 83% of the MRR for isoxaflutole plus atrazine, >200, 119, 23, 23, and 117% of the MRR for dimethenamid plus dicamba/atrazine, 141, 72, 46, 45, and >200% of the MRR for glufosinate plus atrazine, and 81, 29, 18, 24, and 88% of the MRR for nicosulfuron/rimsulfuron plus dicamba/diflufenzopyr, respectively. The herbicide rate required to provide 95% of weed-free corn yield was 61, 22, 130, and 11% of the MRR for isoxaflutole plus atrazine, dimethenamid plus dicamba/atrazine, glufosinate plus atrazine, and nicosulfuron/rimsulfuron plus dicamba/diflufenzopyr, respectively. Nicosulfuron/rimsulfuron plus dicamba/diflufenzopyr had the lowest EI. The results of profitability analysis suggested that the MRR rates do not tend to maximize profit margins. In most cases, there were no significant differences in profit margins for treatments with 40, 60, 80, and 100% of the MRR. Key words: Atrazine, dicamba, diflufenzopyr, dimethenamid, glufosinate, nicosulfuron, rimsulfuron, Zea mays L.

Halosulfuron tankmixes applied preplant incorporated for weed control in white bean (Phaseolus vulgaris L.)

2016 ◽  
Vol 96 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Zhenyi Li ◽  
Rene Van Acker ◽  
Darren E. Robinson ◽  
Nader Soltani ◽  
Peter H. Sikkema
Keyword(s):  
Phaseolus Vulgaris ◽  
Weed Control ◽  
Field Experiments ◽  
Phaseolus Vulgaris L ◽  
Visible Injury ◽  
Wild Mustard ◽  
Green Foxtail ◽  
White Bean ◽  
Bean Yield ◽  
Lamb’S Quarters

Six field experiments were conducted over a two-year period (2013 and 2014) to evaluate the tolerance of white bean and spectrum of weeds controlled with halosulfuron applied preplant incorporated (PPI) alone or tankmixed with trifluralin, pendimethalin, EPTC, dimethenamid-P, or S-metolachlor. Halosulfuron applied alone or in tankmix with trifluralin, pendimethalin, EPTC, dimethenamid-P, or S-metolachlor caused 2% or less visible injury 1 and 4 weeks after emergence (WAE). Halosulfuron applied PPI controlled common lamb's-quarters, wild mustard, redroot pigweed, and common ragweed greater than 90% and green foxtail less than 60% 4 and 8 WAE. Weed biomass and density followed a similar pattern. White bean yield with halosulfuron applied alone or in tankmix with the same herbicides was equivalent to the weed-free control.

Biologically Effective Dose and Selectivity of SAN 1269H (BAS 662H) for Weed Control in Corn (Zea mays)

1999 ◽  
Vol 13 (2) ◽  
pp. 283-289 ◽  
Author(s):  
Peter H. Sikkema ◽  
Stevan Z. Knezevic ◽  
Allan S. Hamill ◽  
François J. Tardif ◽  
Kevin Chandler ◽  
...  
Keyword(s):  
Effective Dose ◽  
Weed Control ◽  
Field Experiments ◽  
Leaf Growth ◽  
Amaranthus Retroflexus ◽  
Ambrosia Artemisiifolia ◽  
Biologically Effective Dose ◽  
Common Ragweed ◽  
Common Lambsquarters ◽  
Wild Buckwheat

Field experiments were conducted in 1996 and 1997 at five locations in southwestern Ontario to develop dose-response curves for SAN 1269H (SAN 835H plus dicamba) for weed control and crop tolerance in corn. SAN 1269H controlled wild buckwheat (Polygonum convolvulusL.), common ragweed (Ambrosia artemisiifoliaL.), common lambsquarters (Chenopodium albumL.), pigweeds (Amaranthus retroflexusL. andA. powelliiS. Wats.), barnyardgrass [Echinochloa crus-galli(L.) Beauv.], and yellow foxtail [Setaria glauca(L.) Beauv.]. Biologically effective doses of SAN 1269H (BAS 662H) were 440, 430, 180, and 40 g/ha for yellow foxtail, barnyard grass, wild buckwheat, and common ragweed, respectively. The biologically effective dose (that which provides 90% reduction in weed dry matter) for common lambsquarters was 560 g/ha when SAN 1269H was applied preemergence (PRE) and 110 g/ha when applied postemergence (POST). When applied PRE at a rate of 420 g/ha, pigweed was controlled, whereas only 85 g/ha was required when applied POST. Grain yield increased with dose of SAN 1269H and did not differ with time of application. Temporary crop injury was observed when SAN 1269H was applied at the four- to six-leaf growth stage. Optimum corn yields were achieved with doses of 100 to 250 g/ha.

scholarly journals Investigations on the pathogenicity of Helminthosporium sorokinianum Sacc. in relation to Phaseolus vulgaris L.

2014 ◽  
Vol 10 (2) ◽  
pp. 283-293
Author(s):  
Barbara Łacicowa ◽  
Zofia Machowicz
Keyword(s):  
Phaseolus Vulgaris ◽  
Root System ◽  
Field Experiments ◽  
Phaseolus Vulgaris L ◽  
Bean Plants ◽  
Before And After

The results obtained in pot and field experiments have shown that <i>Helminthosporium sorokinianum</i> is able to infect bean plants. The cotyledons and roots of shoots during the first three weeks of growth are attacked the most frequently. Dark brown spots occur on the above-mentined organs. The infection of roots and cotyledonsof shoots is responsible for gangrene both before and after germination. Infected plants which remain alive only show symptoms of infection in the root system. The infection of roots by <i>H. sorokinianum</i> in older plants is detromental to growth and causes a decrease in the vield obtained from bean plants.

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