Penetration of bean leaves by asulam as influenced by adjuvants and humidity

Babiker, A. G. T.; Duncan, H. J.

doi:10.1002/ps.2780060613

Cited by 21 publications

(4 citation statements)

References 29 publications

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“…These results support the hypothesis that the uptake of glufosinate is enhanced at high humidity through delayed droplet drying, which keeps the herbicide in solution and extends its availability for uptake. These findings are similar to previous research results showing herbicide uptake is greater at high humidity, where droplets dry more slowly than at low humidity (Babiker and Duncan 1975;Cook et al 1977;Prasad et al 1967).…”

Section: Mean Movementsupporting

confidence: 93%

Effect of humectants on the uptake and efficacy of glufosinate in wild oat (Avena fatua) plants and isolated cuticles under dry conditions

Ramsey¹,

Stephenson²,

Hall³

2006

Weed sci.

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A series of dose–response experiments were performed at low humidity to determine if glufosinate efficacy could be increased by lengthening the drying time through the addition of humectants. Of several humectants evaluated, only 5% glycerol or 5% triethylene glycol when applied with glufosinate produced dry weight reductions and mortality similar to exposure to high humidity.14C-glufosinate movement through isolated wild oat cuticles was greater at high humidity, poorest at low humidity, but intermediate at low humidity in the presence of 5% glycerol in the spray solution. The increases in uptake observed at high humidity and with 5% glycerol at low humidity were characterized by greater initial uptake that continued much longer than that observed at low humidity without humectant.

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Section: Mean Movementsupporting

confidence: 93%

Effect of humectants on the uptake and efficacy of glufosinate in wild oat (Avena fatua) plants and isolated cuticles under dry conditions

Ramsey¹,

Stephenson²,

Hall³

2006

Weed sci.

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“…In past studies, glycerol has been used as a penetrating agent in combination with plant regulators and pesticides (Anonymous, 2011;Babiker and Duncan, 1975;Bahadur et al, 2007;Raupach and Kloepper, 1998). Woody or semiwoody plants treated with 0.5% to 1% colchicines were mixed with a 10% glycerol solution to enhance its effect (Anonymous, 2011).…”

Section: Resultsmentioning

confidence: 99%

Stimulation of Short-term Plant Growth by Glycerol Applied as Foliar Sprays and Drenches under Greenhouse Conditions

Tisserat¹,

Stuff²

2011

horts

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The effects of aqueous solutions applied as foliar spray and drench applications of glycerol were tested on the ‘Chantenay’ carrot (Daucus carota L.) family Apiaceae, corn (Zea mays L.) family Poaceae, and spearmint (Mentha spicata L.) family Lamiaceae under greenhouse conditions. Foliar sprays and drenches were administered to carrots at concentrations of 0, 1, 3, 5, 10, 25, or 50 ml·L−1. Fresh weights, dry weights, and taproot diameter from carrot seedlings sprayed with a solution containing 5 mL·L−1 (50 mm) glycerol increased 105.6%, 158.4%, and 53.8%, respectively, when compared with untreated carrots. Foliar sprays were administered to corn at concentrations of 0, 0.1, 0.3, 0.5, and 1 ml·L−1 and spearmint at concentrations of 0, 1, 5, and 10 mL·L−1. Growth responses increased in corn and spearmint by using certain glycerol concentrations. Fresh weights, dry weights, and shoot length from corn seedlings sprayed with a solution containing 0.5 mL·L−1 (5 mm) glycerol increased 83.5%, 154.6%, and 90.9%, respectively, when compared with untreated corn. Fresh weights, dry weights, and shoot length from mint plants sprayed with a solution containing 5 mL·L−1 (50 mm) glycerol increased 46.6%, 68.7%, and 102.5%, respectively, when compared with untreated plants. Glycerol applications can stimulate growth responses in diverse plant species.

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“…Humectants increase the drying‐droplet time which allows the active ingredient to be available in solution for a longer period. Previous studies demonstrated that humectants and surfactants work better in the presence of each other (Babiker & Duncan, 1975; Cook et al., 1977). Adding surfactant‐humectant adjuvants into the tank mixture may improve consistency of glufosinate efficacy among weed species under unfavorable environmental conditions.…”

Section: Introductionmentioning

confidence: 98%

Influence of surfactant‐humectant adjuvants on physical properties, droplet size, and efficacy of glufosinate formulations

Polli

Alves

Moraes

et al. 2022

Agrosystems Geosci & Env

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Glufosinate efficacy is inconsistent among weed species and under environmental conditions that favor rapid droplet drying. Surfactant‐humectant adjuvants could maximize glufosinate efficacy by increasing wetting and penetration into the leaf surface while decreasing evaporation rate (ER). However, there is a lack of information in the literature about the interaction of surfactant‐humectants adjuvants with glufosinate. The objective of this study was to investigate the influence of surfactant‐humectant adjuvants on the physical properties, droplet size, and efficacy of two glufosinate formulations. Laboratory, greenhouse, and field studies were conducted at the Pesticide Application Technology Laboratory of the University of Nebraska‐Lincoln. Treatment design was a 2 × 5 factorial with two glufosinate formulations combined with five adjuvant treatments plus an untreated control. Density and viscosity of glufosinate solutions mostly increased with the addition of adjuvants. However, the influence of the adjuvants on dynamic surface tension (dST), static contact angle (sCA), and evaporation rate (ER) varied by glufosinate formulation, adjuvant, and relative humidity (RH). Under greenhouse conditions, an improvement in efficacy by adding adjuvants was mainly observed for Interline solutions. The addition of adjuvants to Interline solutions increased biomass reduction up to 19 and 35% for common lambsquarters (Chenopodium album L.) and kochia [Bassia scoparia (L.) A. J. Scott], respectively. Also, some of the adjuvants presented null or antagonistic influence on herbicide efficacy. No increase in control, biomass reduction, and mortality of horseweed (Erigeron canadensis L.) and Palmer amaranth (Amaranthus palmeri S. Watson) was observed with the use of adjuvants under field conditions. Herbicide‐adjuvant‐plant‐environment interaction is complex. Thus, the use of surfactant‐humectant adjuvants may not increase herbicide efficacy.

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Penetration of bean leaves by asulam as influenced by adjuvants and humidity

Cited by 21 publications

References 29 publications

Effect of humectants on the uptake and efficacy of glufosinate in wild oat (Avena fatua) plants and isolated cuticles under dry conditions

Effect of humectants on the uptake and efficacy of glufosinate in wild oat (Avena fatua) plants and isolated cuticles under dry conditions

Stimulation of Short-term Plant Growth by Glycerol Applied as Foliar Sprays and Drenches under Greenhouse Conditions

Influence of surfactant‐humectant adjuvants on physical properties, droplet size, and efficacy of glufosinate formulations

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