Comparison between standard and drift reducing nozzles for pesticide application in citrus: Part I. Effects on wind tunnel and field spray drift

The objective of this study was to evaluate and to compare spray drift potential and field spray drift from pesticide application in citrus orchards carried out mainly comparing standard nozzles with drift reducing nozzles. Two different standard nozzles (hollow cone and full cone) and one Venturi drift reducing nozzle (hollow cone) were tested. Spray drift potential was measured by means of wind tunnel experiments (ISO 22856:2008 method). To estimate field airborne and sedimenting spray drift, two trials with 5 replicates each were carried out (ISO 22866:2005 method) in two different commercial orchards of Clementine mandarins. Results showed that Venturi nozzles significantly reduced drift with the two methodologies. Moreover, the wind tunnel method showed the same trend as the field results. Additionally, spray drift deposition variability was lower for the Venturi nozzles. Therefore, it could be concluded that Venturi nozzles can be recommended to be used in citrus orchards to prevent human and environmental risks and their use could be appropriate for different scenarios where spray drift risk must be mitigated.

[1]  R. A. Fisher,et al.  Design of Experiments , 1936 .

[2]  E. Moltó,et al.  Comparison between standard and drift reducing nozzles for pesticide application in citrus: Part II. Effects on canopy spray distribution, control efficacy of Aonidiella aurantii (Maskell), beneficial parasitoids and pesticide residues on fruit , 2017 .

[3]  H. Levene Robust tests for equality of variances , 1961 .

[4]  J. C. van de Zande,et al.  Nozzle Classification for Drift Reduction in Orchard Spraying; Identification of Drift Reduction Class Threshold Nozzles , 2008 .

[5]  An empirical model based on phenological growth stage for predicting pesticide spray drift in pome fruit orchards. , 2017 .

[6]  R. C. Derksen,et al.  DROPLET SPECTRA AND WIND TUNNEL EVALUATION OF VENTURI AND PRE-ORIFICE NOZZLES , 1999 .

[7]  C. Garcerá,et al.  Spraying citrus orchards with antidrift nozzles. , 2012 .

[8]  J. C. van de Zande,et al.  Classification of spray applications for driftability, to protect surface water , 2000 .

[9]  S. Shapiro,et al.  An Analysis of Variance Test for Normality (Complete Samples) , 1965 .

[10]  D. Stajnko,et al.  Interactions between spray drift and sprayer travel speed in two different apple orchard training systems , 2015, International Journal of Environmental Science and Technology.

[12]  M. C. Butler Ellis,et al.  Bystander exposure to pesticide spray drift: new data for model development and validation. , 2010 .

[13]  Yang Yu,et al.  SPRAY CHARACTERISTICS AND DRIFT REDUCTION POTENTIAL WITH AIR INDUCTION AND CONVENTIONAL FLAT-FAN NOZZLES , 2007 .

[14]  H. E. Ozkan,et al.  Effect of Drift Retardant Chemicals on Spray Drift, Droplet Size and Spray Pattern , 1993 .

[15]  C. Harris,et al.  Agrochemical spray drift; assessment and mitigation—A review* , 2010, Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes.

[16]  David Nuyttens,et al.  Effect of nozzle type, size and pressure on spray droplet characteristics , 2007 .

[17]  B Sonck,et al.  The effect of air support on droplet characteristics and spray drift. , 2007, Communications in agricultural and applied biological sciences.

[18]  C. Sinfort,et al.  Emission of pesticides to the air during sprayer application: A bibliographic review , 2005 .

[19]  Masoud Salyani,et al.  Effects of sprayer operating parameters on airborne drift from citrus air-carrier sprayers , 2013 .

[20]  J. C. van de Zande,et al.  Modelling spray drift from boom sprayers , 1997 .

[21]  Enrique Moltó,et al.  Risk assessment of pesticide spray drift from citrus applications with air-blast sprayers in Spain , 2012 .

[22]  David Nuyttens,et al.  Influence of nozzle type and size on drift potential by means of different wind tunnel evaluation methods , 2009 .

[23]  E. Capri,et al.  Studies on pesticide spray drift in a Mediterranean citrus area , 2003 .