Reduced herbicide doses in field crops: A review

Blackshaw, Robert E.; O’Donovan, John T.; Harker, K. Neil; Clayton, George W.; Stougaard, Robert N.

doi:10.1111/j.1445-6664.2006.00190.x

Cited by 94 publications

(72 citation statements)

References 66 publications

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“…Especially for systemic herbicides (as those tested in the present study), low growth rate of weeds could potentially have negative effects on herbicide efficacy. This fact may have implications in the reduction of herbicide rates in various weed control programs as an approach to reduce production costs, minimize the risk of crop and non-target injuries, lessen carryover concerns, and diminish potential surface and groundwater contamination (Blackshaw et al, 2006;Kudsk, 2008). However, to adopt this approach without risk of weed control failures, other weed control tactics need to be adopted before farmers will be able to use reduced herbicide rates.…”

Section: Resultsmentioning

confidence: 99%

Annual Grasses Control With Topramezone in Mixture With Als-Inhibiting Herbicides

Damalas

Gitsopoulos²,

Koutroubas

et al. 2015

Planta daninha

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Panicoid grasses are major weeds of maize and sugarcane as well as of several other important grains, including sorghum, pearl millet, and foxtail millet. Pot trials were conducted to study the activity and potential interactions of topramezone in mixture with recommended rates of rimsulfuron or nicosulfuron on three annual panicoid grasses (i.e. Echinochloa oryzoides,E.phyllopogon, and Panicum miliaceum). Target weeds were treated at the four- to five-leaf growth stage. On the basis of fresh weight reduction, topramezone alone provided 78% control of E.oryzoides, 68% control of E.phyllopogon, and 99% control of P.miliaceum. Topramezone plus rimsulfuron or nicosulfuron provided decreased control of both Echinochloa spp. compared with topramezone alone. The decreased control of E.oryzoidesand E.phyllopogon was more pronounced with rimsulfuron as a companion herbicide in the mixtures. Slightly decreased control of P.milaceum was observed with topramezone plus rimsulfuron compared with topramezone alone, but this was not the case for topramezone plus nicosulfuron. Increased topramezone rates mixed with rimsulfuron or nicosulfuron did not improve control of E.oryzoides and E.phyllopogon compared with the lowest topramezone rate. Also, increased topramezone rates mixed with rimsulfuron or nicosulfuron showed decreased control of both Echinochloa spp. when compared with either rimsulfuron or nicosulfuron alone, suggesting a two-way interaction between topramezone and the ALS-inhibiting herbicides. The above-mentioned interaction was not observed in P.miliaceum, probably related with species sensitivity to the herbicides tested. Newly introduced or naturalized panicoid grasses in maize fields may complicate selection of companion herbicides and rates for effective weed control.

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Section: Resultsmentioning

confidence: 99%

Annual Grasses Control With Topramezone in Mixture With Als-Inhibiting Herbicides

Damalas

Gitsopoulos²,

Koutroubas

et al. 2015

Planta daninha

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“…The exploitation of competitiveness factors might favour the development of reduced herbicide use strategies for sugar beet (Paolini et al, 1999). Numerous research studies have indicated a few reasons for the potential successful use of reduced doses, including: 1) registered doses are set to ensure adequate control over a wide spectrum of weed species, weed densities, growth stages and environmental conditions, 2) maximum weed control is not always necessary for optimal crop yields, and 3) combining reduced doses of herbicides with other management practices, such as tillage or competitive crops, can markedly increase the odds of successful weed control (Blackshaw et al, 2006;Najafi et al, 2013). Several studies have demonstrated good weed control with reduced herbicide doses (Deveikyte, Seibutis, 2006;Domaradzki, 2009;Kucharski, 2009;Domaradzki, 2011;Najafi et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Control of annual broadleaf weeds by combinations of herbicides in sugar beet

Deveikytė

Seibutis

Feiza

et al. 2015

Zemdirbyste-Agriculture

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Sugar beet is a poor competitor to weeds. Weeds are a major constraint to sugar beet productivity. Field experiments were conducted at Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry (55º23′ N, 23º51′ E) during the period 2010-2012 on a loamy Endocalcari-Epihypogleyic Cambisol (CMg-p-w-can) to determine the influence of tank-mixed herbicides phenmedipham + desmedipham + ethofumesate (136.5 + 106.5 + 168 g ha -1 a.i.) with chloridazon (624 g ha -1 a.i.), metamitron (700 g ha -1 a.i.) and triflusulfuron (3.75 g ha -1 a.i.) on broad leaf weeds. Phenmedipham + desmedipham + ethofumesate was applied at three doses, 1/1, 2/3 and 1/2 of the recommended dose. Metamitron was applied at two doses, 1/1 and 1/2 of the recommended dose. All herbicide combinations acted similarly in reducing these weed species: Chenopodium album, Thlaspi arvense, Tripleurospermum perforatum, Polygonum aviculare, Viola arvensis, Veronica arvensis, Lamium purpureum, Capsella bursa-pastoris and Euphorbia helioscopia. The efficacy of phenmedipham + desmedipham + ethofumesate at full (1/1) dose was similar to that applied in a tank mix with chloridazon, metamitron and triflusulfuron at full dose. There were no significant differences in weed weight. Having reduced the dose of phenmedipham + desmedipham + ethofumesate by 33% and 50% in a tank mix, the dry weight of C. album, T. perforatum and P. aviculare increased not significantly. The addition of chloridazon, metamitron and triflusulfuron at full dose had a similar impact on weeds. The action of triflusulfuron was longer because the weight of dominant weeds (C. album and T. perforatum) decreased (6-37%) during all crop growing period. Reducing the dose of metamitron from 525 to 350 g ha -1 a.i. (33%) in a tank mix with phenmedipfam + desmedipham + ethofumesate at 1/2 dose, the dry weight of C. album, T. perforatum, P. aviculare, V. arvensis and C. bursa-pastoris increased not significantly. By reducing the dose of herbicides in a tank mix, the number of active ingredients (a.i.) should be increased.

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“…The species C. canadensis can produce around 700,000 seeds per plant, depending on the conditions under which it is being grown (SHRESTHA et al, 2010). Therefore, increases in the weed seed bank may occur, compromising long-term profitability (DOYLE;STYPA, 2004;BLACKSHAW et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

2018

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The interference of glyphosate resistant hairy fleabane (Conyza bonariensis) has caused yield losses in soybean crop. Knowledge of the economic threshold is an important aspect for the economic management of resistant weeds. Because of it, the interference of the glyphosate resistant hairy fleabane density on the soybean yield loss was evaluated, as well as to estimate the economic threshold. Two experiments were conducted to verify the effect of different weed densities on the yield of two soybean cultivars (BRS Estância and BMX Turbo). Weed density ranged from 0 to 124 plants m-2. The yield of the BRS Estância decreased by 1.4% to the increase of one single plant, while for the BMX Turbo the loss was 25.9%. Soybean yield and economic threshold were lower for the BMX Turbo cultivar compared to the cultivar BRS Estância, which can be attributed to the genotype, competitive ability, weed development stage and/or environment. Increases in crop yield expectation, soybean price and herbicide efficiency reduce the economic threshold, indicating that the adoption of control measures should be taken when the weed density is low. Due to the high cost of hairy fleabane control, it is only feasible at high densities.

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Reduced herbicide doses in field crops: A review

Cited by 94 publications

References 66 publications

Annual Grasses Control With Topramezone in Mixture With Als-Inhibiting Herbicides

Annual Grasses Control With Topramezone in Mixture With Als-Inhibiting Herbicides

Control of annual broadleaf weeds by combinations of herbicides in sugar beet

Soybean yield loss and economic thresholds due to glyphosate resistant hairy fleabane interference

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