Effect of spray volume, spray pressure and adjuvant volume on efficacy of sethoxydim and fenoxaprop-p-ethyl

McMullan, Patrick M.

doi:10.1016/0261-2194(95)00061-5

Cited by 13 publications

(11 citation statements)

References 15 publications

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“…In 56 % of studies examined by Knoche (1994), a decrease in the application volume rate led to an improvement or no effect on the efficacy of herbicides. This is consistent with other studies (McMullan 1995;Etheridge et al 2001;Ramsdale and Messersmith 2001), conducted after 1994. Changing the spray droplet size will impact the deposition, but the effect on coverage was not as correlated (Hanna et al 2009…”

Section: Introductionsupporting

confidence: 82%

“…The extrapolation of the results from this study and the effect on herbicide efficacy are difficult, but results from previous studies (Knoche 1994;McMullan 1995;Etheridge et al 2001;Ramsdale and Messersmith 2001) suggest that reduced coverage from reduced application volume rate did not affect efficacy with some pesticides. It is clear that coverage is reduced when spray volume rate is decreased (Table 7).…”

Section: Discussionmentioning

confidence: 97%

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Towards the optimisation of Coarse sprays to reduce drift and improve efficacy in Australian cropping systems

Ferguson¹

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The optimisation of Coarse sprays for control of insects, weeds, and diseases in agriculture involves understanding how those technologies are classified and selected for use. Coarse sprays are the focus of this thesis, because Coarse is a spray size classification that balances adequate coverage, while reducing pesticide spray drift. Spray drift is detrimental, and by selecting coarser droplet sprays, spray drift can be minimised. The initial research study in this thesis sought to identify the repeatability of each nozzle type by randomly selecting five units to test consistency of droplet size measurements across nozzle type.The optimisation of Coarse sprays involves understanding differences that separate uniform technologies, especially when uniform nozzles of the same droplet size classification category are selected. When using plants and efficacy studies alone to quantify spray coverage, specific coverage values are difficult to determine. This consideration prompted studies with artificial collectors to quantify droplet coverage and provide the droplet distribution across the collector to help aid in technology selection. Results from these studies showed that nozzles which produced the same spray quality based on the droplet size distribution did not result in similar coverage across collector types. Nozzles that resulted in the highest coverage were further studied in the subsequent chapters.The optimisation of Coarse sprays involves understanding how sprays move within plant canopies. Consistent spray coverage that is evenly distributed throughout the canopy is necessary to control pest populations that negatively affect yield. As applicators are switching to coarser sprays to reduce risk and liability of pesticide spray drift, concerns about efficacy loss are increasing. Results showed that droplet number densities were inversely related to the droplet size produced by the nozzles, yet coverage was influenced more by application volume rate than droplet size.The optimisation of Coarse sprays involves ensuring that measurement methods and techniques are precise for the selection of the best technologies. A freely available smartphone application (app), SnapCard was developed to provide for in-field analysis of spray collectors. Results from this study showed consistent agreement between Image J and the new app, SnapCard, both of which were used consistently in this study. 3 The optimisation of Coarse sprays requires using novel techniques for characterising sprays, notably artificial collectors. The use of artificial collectors for spray characterisation is well accepted, but there is no literature to bridge the knowledge gap to understand how each major artificial collector type differs. Using all collector types (water sensitive paper, Kromekote ® and Mylar ® ) in tandem was useful to properly characterise the sprays, in addition to helping to quantify the differences between each collector type for coverage and droplet number density analyses.An optimal Coarse spray should not drift in ...

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Section: Introductionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 97%

Towards the optimisation of Coarse sprays to reduce drift and improve efficacy in Australian cropping systems

Ferguson¹

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“…Increase of this parameter leads to dilution of herbicide and reduction of spray solution retention on treated plants, giving herbicide effect decrease (Shaw, et al, 2000). McMullan (1995) reports, that reduction of spray volume caused increase of sethoxydim efficacy, but did not influence fenoxaprop-P-ethyl. For contrast, spray volume did not affect activity of trinexapac-ethyl, although higher efficacy at low volume level was observed when adjuvant was added to spray solution (Fagerness and Penner, 1998).…”

Section: Resultsmentioning

confidence: 99%

The influence of selected spraying parameters on two formulation of sulfonylurea herbicides effect

Kieloch¹,

Domaradzki²

2013

JCEA

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The objective of this study was the evaluation of spray volume and nozzle type effect on different formulation (water dispersible granules -WG and oil dispersion -OD) of two sulfonylurea herbicides: the mixture iodosulfuron methyl sodium + amidosulfuron and iodosulfuron methyl sodium + mesosulfuron methyl efficacy. There were investigated three levels of spray volume (125 l*ha ) and two types of nozzle (extended range flat nozzle TeeJet XR 11003-VS and drift guard flat nozzle TeeJet DG 11003-VS). Each herbicide was used at recommended dose and reduced by half. Spray volume and nozzle type did not affect activity of the mixture iodosulfuron methyl sodium + amidosulfuron, but differentiated the efficacy of OD formulation of iodosulfuron methyl sodium + mesosulfuron methyl, when it was applied at lowered dose. As spray volume rose, herbicide efficacy decreased. Nozzle type influenced OD formulation of the mixture iodosulfuron methyl sodium + mesosulfuron methyl, independently on dose. Significantly weaker efficacy was obtained when drift guard nozzle was used.Keywords: dose, efficacy, formulation, spray volume, sulfonylurea herbicide, type of nozzle Streszczenie Celem badań była ocena wpływu wydatku cieczy uŜytkowej i rodzaju dysz opryskiwacza na róŜne formy uŜytkowe (granulat do sporządzania zawiesiny wodnej -WG i zawiesina olejowa do rozcieńczania wodą -OD) dwóch herbicydów sulfonylomocznikowych: mieszaniny jodosulfuron metylosodowy + amidosulfuron oraz mieszaniny jodosulfuron metylosodowego z mezosulfuronem metylowym. Oceniano trzy poziomy wydatku cieczy uŜytkowej (125 l*ha zastosowano w dawce zalecanej oraz obniŜonej o połowę. Wydatek cieczy uŜytkowej oraz rodzaj dysz opryskiwacza nie wpłynęły na działanie mieszaniny jodosulfuron metylosodowy + amidosulfuron. Wydatek cieczy uŜytkowej zróŜnicował skuteczność formy olejowej (OD) mieszaniny jodosulfuronu metylosodowego z mezosulfuronem metylu aplikowanego w dawce zredukowanej. Wraz ze wzrostem wydatku cieczy uŜytkowej, malała skuteczność herbicydu. Rodzaj dysz wpłynął na skuteczność działania formy OD powyŜszej mieszaniny, niezaleŜnie od dawki. Znacząco słabszą skuteczność osiągnięto, gdy zastosowano dyszę antyznoszeniową.Słowa kluczowe: dawka, forma uŜytkowa, herbicydy sulfonylomocznikowe, rodzaj dyszy, skuteczność, wydatek cieczy uŜytkowej Detailed abstract Skuteczność działania herbicydu jest wypadkową wielu czynników. O końcowym efekcie chwastobójczym zastosowanego środka w duŜym stopniu decyduje proces jego pobrania przez chwasty, od którego zaleŜy ilość substancji aktywnej zaabsorbowanej przez roślinę. Właściwy dobór parametrów technicznych opryskiwania oraz właściwości fizyko-chemiczne cieczy uŜytkowej wpływa na dokładność pokrycia opryskiwanych powierzchni i jej retencję, a tym samym ilość pobranego herbicydu.W ramach badań wykonano doświadczenia w warunkach kontrolowanych (szklarnia) nad oceną wpływu wydatku cieczy uŜytkowej i rodzaju dysz opryskiwacza na róŜne formy uŜytkowe (granulat do sporządzania zawiesiny wodnej -WG i zawiesina olejowa do ro...

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“…Cabanne and Lamrani Amine (2003) also observed that a decrease in volume median diameter (VMD) resulted in an increase in spray retention by cultivated oats ( Avena sativa L.) plants, irrespective of the method used to vary VMD (change of nozzle or operating pressure). The study by McMullan (1995) which showed no change in activity of fenoxaprop‐P‐ethyl with a decrease in volume rate is in this respect a peculiar case because the volume differences were obtained by different forward speeds of the boom and no change in nozzle or operating pressure was involved.…”

Section: Introductionmentioning

confidence: 90%

Influence of application volume on the efficacy of clodinafop‐propargyl and fenoxaprop‐P‐ethyl on oats

Gauvrit¹,

Lamrani²

2008

Weed Research

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The influence of application volume on the efficacy of clodinafop-propargyl and fenoxaprop-P-ethyl on cultivated oats (Avena sativa) was studied in the glasshouse. Both herbicides were more efficacious when applied in 75 L ha )1 than in 300 L ha )1 , with 11002 and 11006 nozzles respectively. However, when the same two volume rates were created by varying the speed of a 11003 nozzle, clodinafop-propargyl efficacy was not affected by application volume, whereas fenoxaprop-P-ethyl remained more efficacious at 75 L ha )1 . This suggests that in the first experiment, fenoxaprop-P-ethyl efficacy was affected by changes in both spray quality and concentration, whereas only the former influenced clodinafop-propargyl efficacy. The hypothesis that the fenoxaprop-P-ethyl formulation was more influenced by concentration than clodinafop-propargyl was supported by dynamic surface tension studies and measures of active ingredient retention by oat plants. Within the practically relevant concentration range considered, surface activity of clodinafop-propargyl remained low, with little influence on herbicide retention. In contrast, depending on the concentration, surface activity of fenoxaprop-P-ethyl was below or above levels that were critical for its retention. Although these differences may not be as apparent in the field as in the glasshouse, our study certainly indicates that both clodinafop-propargyl and fenoxaprop-P-ethyl are herbicides favoured by low application volumes.

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Effect of spray volume, spray pressure and adjuvant volume on efficacy of sethoxydim and fenoxaprop-p-ethyl

Cited by 13 publications

References 15 publications

Towards the optimisation of Coarse sprays to reduce drift and improve efficacy in Australian cropping systems

Towards the optimisation of Coarse sprays to reduce drift and improve efficacy in Australian cropping systems

The influence of selected spraying parameters on two formulation of sulfonylurea herbicides effect

Influence of application volume on the efficacy of clodinafop‐propargyl and fenoxaprop‐P‐ethyl on oats

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