Comparison of spray deposits and efficacy against powdery mildew of aerial and ground-based spraying equipment in viticulture

Viret, Olivier; Siegfried, W.; Holliger, E.; Raisigl, U.

doi:10.1016/s0261-2194(03)00119-4

Cited by 46 publications

(26 citation statements)

References 4 publications

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“…This simulation is a necessary step towards the simulation of crop spray efficacy in aerial spraying delivery The results revealed that there is considerable increased in spray drift and droplets trajectories with the increased in spray released height. These findings support the same result obtained by Viret et.al [7]. The highest downwind deposition was found at 4.7 m at the distance of 50 m from the spray sourced, while the lowest was found at 3.7 m above the ground.…”

Section: Conclusion and Recommendationssupporting

confidence: 93%

“…Spray drift is undesirable, but still the important role of pesticides or plant protection products in modern agriculture is undeniable in terms of reducing pest attacks and increasing high yield [5,6]. Uneven spray distribution and drifted to adjacent areas has been pronounced as serious problems regarding aerial spray delivery [7]. Uniformity spray coverage area are desired in aerial crop spraying, thus improving aerial pesticide application to reach a satisfactory level of spray deposition in most cropping system is essential.…”

Section: Introductionmentioning

confidence: 99%

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A numerical analysis of flat fan aerial crop spray

Fesal

Fawzi

Omar

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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View the article online for updates and enhancements. Abstract. Spray drift mitigation, in the agriculture aerial spraying literature, and spray quality in the application of plant protection products, still continues as two critical components in evaluating shareholder value. A study on off-target drift and ground deposit onto a 250 m strip were simulated through series of Computational Fluid Dynamic (CFD) simulations. The drift patterns for evaporating droplets were released from a constant aircraft velocity at 30 m/s (60 mph) carrying 20 m swath width spray boom with 12 fan-type nozzles at released height from the ground ranging from 3.7 m to 4.7 m. Droplet trajectories are calculated from the given airspeed with a Lagrangian model for particle dispersion excluding any wind effect perturbation. The proposed CFD's model predictions agreed well with cited literatures for a wide range of atmospheric stability values. The results revealed that there is considerable increased in spray drift and droplets trajectories with the increased in spray released height. It suggested that a combination of low aircraft spray released height with low airspeed is essential to improve spray quality and maximizing uniform deposition on the target area are significant in minimizing spray drift risks.

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Section: Conclusion and Recommendationssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

A numerical analysis of flat fan aerial crop spray

Fesal

Fawzi

Omar

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Greater than three times the spray volume was retained on hedgerow compared with bush apple trees reflecting the larger leaf surface area per hectare for the hedgerow (47, 150 m 2 ha À1 ) compared with the bush trees (32, 780 m 2 ha À1 ). Viret et al (2003) also observed large differences in leaf residues of grapevines sprayed at bunch closure (BBCH 77) using different equipment and spray volumes. There was a greater than four-fold difference in mean normalized deposits of tracer (ng cm À2 ) for the spray equipment investigated (tunnel sprayer 4 knapsack blower 4 axial fan sprayer 4 over-row sprayer 4 large volume air-blast sprayer 4 helicopter).…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

A new tool for the evaluation of crop residue trial data (day-zero-plus decline)

MacLachlan¹,

Hamilton²

2010

Food Additives & Contaminants: Part A

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An approach is presented for the prediction of pesticide residue concentrations in food and feed commodities produced from foliar-treated crops. It uses limited residue trial data and relies on information on spray retention and decline rates of residues following application. The use of the simple approach is demonstrated for residues of a variety of pesticides and the results compared with data sets evaluated by the Joint FAO/WHO Meeting on Pesticide Residues (JMPR) using expert judgement and also with estimates of high residues obtained using statistical methods. It is proposed that the approach should constitute an additional tool for the risk assessment of pesticide residues; it contributes to the estimation of maximum residue limits (MRLs) and high and median residues, which are needed for risk assessment. The approach should be particularly useful in situations where only a few residue trials are available such as often occurs for minor crops.

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“…The objective of further research will be to determine whether the new air-assistance system, developed for this sprayer, will be efficient in improving spray distribution uniformity, which has often been reported as unsatisfactory from most models of experimental or commercial tunnel sprayers proposed so far [Siegfried 1996;Viret 2003;Planas 2002]. …”

Section: Discussionmentioning

confidence: 99%

A Novel, Air-Assisted Tunnel Sprayer for Vineyards: Optimization of Operational Parameters and First Assessment in the Field

Pergher¹,

Petris²

2009

J Agricult Engineer

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Tunnel (recycling) sprayers have long been recognised as an important tool to reduce drift losses. Depending on the crop and the growth stage, tunnel sprayers may recycle up to 60% of the spray volume, thus enabling the farmers to control pests even at reduced PPP dose rates. However, the introduction of tunnel sprayers in Italian vine-growing farms has been hindered so far by high machine cost, low working speed, and often unsatisfactory uniformity of deposition, generally related to the difficulty of correctly managing the air currents inside the tunnel. Recently, a new prototype, air-assisted shielded sprayer has been developed by the University of Udine and Agricolmeccanica s.r.l. The two-row, tractor-mounted sprayer uses a lamellae separator wall, placed in front of each nozzle boom, to recover the excess spray which has not deposited on the canopy. Initial tests have been conducted to analyse the effects of the main sprayer settings (air flow rate, distance between the shields, and orientation of the air outlets) on spray recovery. Maximum recovery rate was 95.1% under static conditions. The sprayer was then used for spray application in the vineyard during the 2007 season, showing high reliability and work capacity. The recovery rate was 34% to 77% under field conditions, depending on the leaf area of the crop and other factors.

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Comparison of spray deposits and efficacy against powdery mildew of aerial and ground-based spraying equipment in viticulture

Cited by 46 publications

References 4 publications

A numerical analysis of flat fan aerial crop spray

A numerical analysis of flat fan aerial crop spray

A new tool for the evaluation of crop residue trial data (day-zero-plus decline)

A Novel, Air-Assisted Tunnel Sprayer for Vineyards: Optimization of Operational Parameters and First Assessment in the Field

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