Effect of Organosilicone Surfactants on the Rainfastness of Primisulfuron in Velvetleaf (<i>Abutilon theophrasti</i>)

Sun, Jinxia; Foy, Chester L.; Witt, Harold

doi:10.1017/s0890037x00039920

Cited by 15 publications

(11 citation statements)

References 9 publications

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“…This is a problem shared with synthetic fungicides. Different adjuvants have been tested and proven to increase rain fastness (Roggenbuck et al, 1990;Reddy and Singh, 1992;Sun et al, 1996). Despite all of the work that still needs to be done, this study provides the basis for an alternative method to synthetic chemical application that can be developed quickly for farmer use.…”

Section: Discussionmentioning

confidence: 99%

Plant extracts containing caffeic acid and rosmarinic acid inhibit zoospore germination of Phytophthora spp. pathogenic to Theobroma cacao

Widmer

Laurent²

2006

Eur J Plant Pathol

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The three most important species of Phytophthora worldwide causing black pod disease of cacao are P. palmivora, P. megakarya, and P. capsici. Chemicals are effective in controlling this disease but more natural methods would be preferred. One alternative is to use natural plant extracts. Rosemary and lavender leaf extracts were found to be effective in reducing germination of P. capsici, P. megakarya, and P. palmivora zoospores when supplemented to agar plates at different dilutions. The extracts displayed the biggest impact on P. megakarya zoospores where it completely inhibited germination at a 25% dilution of the prepared extract. When applied to cacao leaf disks, rosemary extract reduced necrosis caused by P. megakarya zoospores. In a bioassay, pears first treated with lavender extract showed no symptoms of P. megakarya infection compared with the non-treated controls. Based upon HPLC analyses, the active compound in these extracts was determined to be caffeic acid, rosmarinic acid or some simple derivative thereof. When added to agar plates, synthetic caffeic acid and rosmarinic acid completely inhibited germination of P. capsici, P. megakarya, and P. palmivora zoospores at concentrations of 3 and 6 g l )1 , respectively. In addition, sage and rice bran extracts, which both contain caffeic acid, were also effective in reducing zoospore germination. In contrast, inhibition of Botrytis cinerea or Trichoderma asperellum conidia germination did not occur, displaying some level of specificity. These extracts could provide an economically safe method for reducing damage caused by black pod disease on cacao until resistant varieties are developed and released.

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Section: Discussionmentioning

confidence: 99%

Plant extracts containing caffeic acid and rosmarinic acid inhibit zoospore germination of Phytophthora spp. pathogenic to Theobroma cacao

Widmer

Laurent²

2006

Eur J Plant Pathol

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“…Addition of the water conditioning agent Quest (0.25% v/v) to glyphosate spray mixtures diminished the influence of simulated rain events following glyphosate application [97]. OSS increased rainfastness of primisulfuron on velvetleaf (Abutilon theophrasti Medicus) more than other adjuvants, although no differences in velvetleaf control occurred under rain-free conditions [98]. NIS (20% isodecyl alcohol ethoxylate plus 0.7% silicone surfactants), an anionic surfactant (25.5% alkylethersulfate sodium salt), and a vegetable oil (95% natural rapeseed oil with 5% compound emulsifiers) significantly improved the rainfastness of tribenuron-methyl on Tripleurospermum inodorum, with differences among the adjuvants being more pronounced when rain occurred shortly after herbicide application.…”

Section: Interaction Between Herbicide Absorption/translocation and Amentioning

confidence: 99%

Herbicides and Adjuvants

Pacanoski¹

2015

Herbicides, Physiology of Action, and Safety

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Abstract"djuvants are any substance either added in a herbicide formulation or added to the spray tank that modifies herbicidal activity or application characteristics, such as better mixing and handling, increasing droplet coverage, spray retention and droplet drying, increasing herbicide cuticle penetration and cellular accumulation reducing leaching of herbicide through the soil profile, etc. The interactions between herbicide adjuvants and herbicide activity, however, are not simple processes, and depend on factors that include crop/weed leaf surface, droplet characteristics, adjuvant type, chemical form of the herbicide, and environmental conditions. Understanding the complexity of these interactions is essential for optimum herbicide utilization, particularly in prolonging, enhancing and improving the efficacy reduction of the critical rain-free period minimizing herbicide leaching into groundwater and decreasing harmful effects to non-target plants and animals.

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“…The surfactants provide increased leaf surface area covered by the herbicide, reduction in the activity of cuticular waxes, delay in crystallization of the herbicides formulations deposited on the leaf surface, and also increased penetration of these products via stomata (Gaskin e Zabkiewicz, 1992;Stock e Holloway, 1993;Sun et al, 1996;Procópio et al, 2002). Some authors claim that another benefit caused by surfactants to the herbicide spray mix is that this practice can provide a reduction in herbicide doses, as well as improvements in weed control on rainy days (Singh e Mack, 1993).…”

Section: Introductionmentioning

confidence: 99%

Surfatante siliconado e glyphosate no controle de Brachiaria decumbens

Teixeira¹,

Veronese

Christoffoleti

2015

RBHerbicidas

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-The research goal was to evaluate the effects of silicone surfactant and simulated rainfall in glyphosate efficiency in controlling Brachiaria decumbens. The experiments were carried out at (a unit of the University of São Paulo) Escola Superior de Agricultura Luiz de Queiroz (ESALQ -Luiz de Queiroz College of Agriculture) in greenhouse conditions, in a randomized block design with four replications. In one experiment, a simulated rainfall of 10 mm was carried out, 30 minutes after treatments application, and in the other there was no simulation. The treatments were arranged in a 5x3 factorial arrangement, with the first factor corresponding to the doses of glyphosate (0, 135, 270, 540 and 1080 g ha -1 a.e.), and the second one to the doses of silicone surfactant (0, 50 and 100 mL ha -1 ). The applications were performed at 30 days after sowing. In the presence of a simulated rainfall, the percentage of control was increased and chlorophyll content was reduced in the dose of 135 g ha -1 a.e. of glyphosate, together with 100 mL ha -1 of silicone surfactant. Increase in lipid peroxidation was also observed with the addition of 100 mL ha -1 . In the experiment without a simulated rain, at seven days after treatments application, a higher percentage of control was observed at doses of 540 and 1080 g ha -1 a.e. with 100 mL ha -1 of silicone surfactant. Therefore, the use of silicone surfactant at a dose of 100 mL ha -1 increases the efficiency of glyphosate in the control of Brachiaria decumbens in the absence of simulated rain and rain conditions held for half an hour after application.

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Effect of Organosilicone Surfactants on the Rainfastness of Primisulfuron in Velvetleaf (Abutilon theophrasti)

Cited by 15 publications

References 9 publications

Plant extracts containing caffeic acid and rosmarinic acid inhibit zoospore germination of Phytophthora spp. pathogenic to Theobroma cacao

Plant extracts containing caffeic acid and rosmarinic acid inhibit zoospore germination of Phytophthora spp. pathogenic to Theobroma cacao

Herbicides and Adjuvants

Surfatante siliconado e glyphosate no controle de Brachiaria decumbens

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