Teores de água no solo e eficácia do herbicida fomesafen no controle de Amaranthus hybridus

Zanatta, Jocemar Francisco; Procópio, S.O.; Manica, R.; Pauletto, Eloy Antônio; Filho, Alberto Cargnelutti; Várgas, Leandro; Sganzerla, Daiane Cristina; Rosenthal, Mariane D’Avila; Pinto, J.J.O.

doi:10.1590/s0100-83582008000100015

Cited by 20 publications

(12 citation statements)

References 15 publications

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“…In applications of reduced doses of herbicides it is noticed a gradual behavior of plants dry mass and it is inversely proportional; the lower the applied dose, the higher was the plants dry masses, a fact noticed in the applications of all studied products. Similar results were found by Zanatta et al (2008), in which the water content in soil affected the efficiency of fomesafen herbicide on A. hybridus plants, but the level of influence varied with the applied dose. The application of the recommended herbicide provided a satisfactory control of this weed, regardless the soil moisture content, which did not occur when applied at lower doses.…”

Section: Resultssupporting

confidence: 83%

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

et al. 2012

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This project aimed to relate the control efficiency of ACCase inhibiting herbicides applied post-emergence to Digitaria horizontalis plants under different soil water contents. The experiments were conducted in a greenhouse, with the application of three different herbicides (fluazifop-p-butyl, haloxyfop-methyl, and sethoxydim + mineral oil Assist). The experimental design used for each herbicide was completely randomized, with four replications, consisting of a 3 x 4 factorial, with the combination of water management strategies (-0.03, -0.07 and -1.5 MPa) and four doses of these products (100%, 50%, 25%, and 0% of the recommended dose). Herbicide application was made at two vegetative stages, 4-6 leaves and 2-3 tillers. The visual phytotoxicity evaluations were performed at 14 days after application and the plant dry weight at the end of the study was evaluated. The control efficiency was not affected by water management strategies when applied to the recommended dose of the herbicides in early stages of plant development (4-6 leaf stage). In late applications (2-3 tiller stage) the plants held under drought stress showed less phytotoxicity.

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Section: Resultssupporting

confidence: 83%

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

et al. 2012

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“…Under dry conditions, the efficacy of PRE herbicides usually decreases (Zhang et al 2001;Zanatta et al 2008); however, intensive precipitation after application of these herbicides can cause crop injury (Stickler et al 1969;Soukup et al 2004). This effect is especially important for sunflower because the selectivity of most herbicides is dependent on the position of the herbicide layer on the soil surface and the distribution of seeds on the soil profile.…”

mentioning

confidence: 99%

Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions

Jursík¹,

Soukup²,

Holec³

et al. 2015

Plant Prot. Sci.

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Jursík M., Soukup J., Holec J., Andr J., Hamouzová K. (2015): Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions. Plant Protect. Sci., 51: 214-222.We ranked the most frequently used pre-emergent herbicides in sunflower (Helianthus annuus) according to their efficacy and selectivity under different soil moisture conditions within 2008-2011. The efficacy of oxyfluorfen, aclonifen, acetochlor, dimethenamid, and propisochlor on the majority of weeds (Chenopodium album, Echinochloa crus-galli, Amaranthus retroflexus, Mercurialis annua, and Solanum physalifolium) was only slightly affected by the soil moisture and these herbicides can be used in arid and semiarid regions. The efficacy of linuron, prosulfocarb, and pethoxamid was strongly affected by soil moisture and was insufficient under dry conditions. The majority of herbicides showed good selectivity for sunflower. Crop injury rate of 5-15% was recorded after application of flurochloridone and acetochlor. For flurochloridone, the phytotoxicity increased due to irrigation after herbicide application. The highest sunflower injury rate (27-35%) was recorded after application of oxyfluorfen.

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“…Increased cuticle thickness and leaf pubescence in response to drought, will reduce herbicide entry into leaves (Patterson, 1995). Lower precipitation amounts throughout the season may result in water stress conditions that affect both plant growth and herbicide efficacy (Zanatta et al, 2008). Increases environmental stress on crops may make them more vulnerable to attack by insects and plant pathogens and less competitive with weeds (Patterson, 1995).…”

Section: Effect Of Precipitationmentioning

confidence: 99%

Climate Change’s Impacts on Weeds and Herbicide Efficacy: A Review

Kumar¹,

Kumar²

2017

Int.J.Curr.Microbiol.App.Sci

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Climate change is a natural and continuous process. But recent relatively rapid change in climate occurs due to anthropogenic activities which makes alarming attention because it contributes largely to global warming by affecting the greenhouse gases (GHGs) and aerosols. GHGs mainly CO 2 , methane, nitrous oxide CFC11, CFC12, HCFC22and HFC23 with different global warming potential accumulate in atmosphere and increase in concentration over time creating the so called "greenhouse effect". This effect can alters balance by transmitting incoming solar radiation but absorbing outgoing thermal radiation from surface. Atmospheric CO 2 rose from 280 to 387 μmolmol -1 from 1750 to 2007 and expected to reach 600 μmolmol -1 by 2050 and global earth surface temperature is likely to rise in a range of 1.1 to 6.4°C during the 21st century due to the rising CO 2 concentration. Weeds are complex in nature and have significant negative effect on agriculture. Chemical weed control becomes major choice/tool because of its economic, easy to use, greater efficacy, due to scarcity of labour and time saving. Climate component viz., light, CO 2 , temperature, precipitation, humidity, wind, environmental stress etc. affect crop-weed competition and efficacy of applied herbicides. Light stimulates weed seed development and leaf shape. Light is the source of energy for photosynthesis and the rate of photosynthesis determines the rate of phloem translocation of assimilates and subsequent phloem translocation will increase the movement of foliar-applied systemic herbicides. Most crops are C 3 and most weeds are C 4 , and hence weed competition will consequently decrease as CO 2 increases, should not be viewed as universal axiom as there are four major C 4 crops of economic importance (corn, pearlmillet, sorghum, and sugarcane), and their many important C 3 weeds. Increasing CO 2 concentration increases the starch concentration in tissue and reduces the protein content leads to less demand of amino acids synthesis which alters the efficacy of ALS inhibitors herbicides. High temperature shortens the growth phases, stimulate stomata conductance and lowers the viscosity of cuticular lipids leads to increase permeability and diffusion of herbicides through the cuticle. Warmer temperature also reduce uptake of herbicides due to rapid drying of droplets. Increasing temperatures may mean an expansion of weeds into higher latitudes or higher altitudes.. Increased cuticle thickness and leaf pubescence in response to drought, will also reduce herbicide entry into leaves. At higher humidity leaf retention time of herbicides mainly hydrophilic increases. Blowing wind may cause spray drift or dry up the spray droplet. So there is need to pay special attention and to study the impact of climate factors on weed life, crop-weed competition and herbicide efficacy so that adaptation and mitigation strategies can be developed for changing climate. K e y w o r d sClimate changes, Natural process, Greenhouse effect, Environment.

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Teores de água no solo e eficácia do herbicida fomesafen no controle de Amaranthus hybridus

Cited by 20 publications

References 15 publications

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

Efficacy of herbicides applied to Digitaria horizontalis plants under different water conditions

Efficacy and selectivity of pre-emergent sunflower herbicides under different soil moisture conditions

Climate Change’s Impacts on Weeds and Herbicide Efficacy: A Review

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