Spray deposits and losses in different sized apple trees from an axial fan orchard sprayer: 3. Effects of air volumetric flow rate

Cross, J. V.; Walklate, P. J.; Murray, R. A.; Richardson, G. Mark

doi:10.1016/s0261-2194(02)00192-8

Cited by 94 publications

(69 citation statements)

References 16 publications

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“…The effect of conventional (ATR) and air induction (TVI) nozzle type on ground DVs was significant (Table 6). On the other hand, although authors proved the efficacy of reduced fan airflow rate in spray drift reduction [103], no statistical differences were detected for the effect of fan airflow rate (High and Low) ( Table 6). Figure 9b compares obtained ground spray drift curves with reference ones [42].…”

Section: Drift Evaluation In Apple Tree Orchardmentioning

confidence: 91%

Ground Deposition and Airborne Spray Drift Assessment in Vineyard and Orchard: The Influence of Environmental Variables and Sprayer Settings

et al. 2017

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Spray drift assessment encompasses classification of the capacity of each sprayer/ technology/setting combination to reduce or avoid the spray drift risk, as well as drift measurement to define buffer zones mandated during pesticide application. Compounding the challenge of these tasks is the great variability of field evaluation results from environmental conditions, spray application technology, canopy structure, and measurement procedures. This study, performed in Spanish context, evaluates the effects of different parameters on comparative measurements of ground and airborne spray drift employing the ISO22866:2005 protocol. Four configurations of air blast sprayers, derived from two fan airflow rates and two nozzle types (conventional and air-induction), were tested in orchard and vineyard at late growth stage. Spray drift curves were obtained, from which corresponding Drift Values (DVs) were calculated using an approximation of definite integral. Both sprayer settings and environmental variables statistically affect spray drift total amounts and result variability. PCA analysis showed that nozzle type and wind speed characteristics explained 51% and 24% of the variance, respectively. In particular, mean wind direction influence ground sediments (Pr < 0.01) and maximum wind speed strongly influence airborne drift value (Pr < 0.0001). The wind characteristics concealed the influence of adopted fan airflow rates on final spray drift assessment results. The effect of uncontrollable environmental conditions makes objective and comparative tests difficult.

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Section: Drift Evaluation In Apple Tree Orchardmentioning

confidence: 91%

Ground Deposition and Airborne Spray Drift Assessment in Vineyard and Orchard: The Influence of Environmental Variables and Sprayer Settings

et al. 2017

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“…Moreover, while no fungicides were applied against brown rot in our conditions, it might be assumed that the increased openness of the canopy, in addition to the preferential location of the fruit at the periphery of the tree under CentP compared to that under conventional pruning, is likely to improve the efficiency of spraying [31]. This assumption, which remains to be tested, combined with the limited incidence of brown rot under the Axis and CentP management practices, might help fruit growers reduce the use of pesticides in peach orchards.…”

Section: Resultsmentioning

confidence: 99%

Limiting brown rot incidence in peach with tree training and pruning

Bussi¹,

Plénet²,

Merlin³

et al. 2015

Fruits

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-Introduction. To limit peach brown rot incidence in a mid-season peach orchard cv. 'Conquise', three combinations of tree training and pruning treatments were assessed: open vase training with conventional pruning (Control); open vase with centrifugal pruning (CentP); vertical axis training with centrifugal pruning (Axis). Materials and methods. The test orchard was divided into four blocks, each with the three tree management treatments in a randomized complete block design. Brown rot incidence as well as fruit production and quality were assessed over five successive years. Results and discussion. The lowest brown rot incidence values were detected under Axis and the highest under Control, with values for CentP being intermediate. The reduced incidences under CentP and Axis training were observed around two weeks before fruit maturity and were maintained until post-harvest storage. Compared to the Control, CentP and Axis resulted in higher trunk cross sectional areas, yields and monetary returns. CentP and Axis also tended to enhance peach internal quality, i.e., increase of total soluble solids, but work time devoted to pruning and thinning under CentP and Axis was greater than for the Control. Conclusion. Appropriate tree management, a vertical axis training system and centrifugal pruning, appears to decrease peach disease sensitivity. This could result in reduced use of pesticide sprays for brown rot control.

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“…Esses resultados foram reproduzidos quando a velocidade do vento era baixa. Mas, em velocidades mais altas, os depósitos eram mais baixos nas taxas menores (CROSS et al, 2001).…”

Section: Persimmon Crop Is Growing In Importance In Brazil and With unclassified

Turboatomizador e repasse com pistola manual na cobertura de pulverização de agrotóxicos em caquizeiro (Diospyros kaki L.f.)

et al. 2013

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Spray deposits and losses in different sized apple trees from an axial fan orchard sprayer: 3. Effects of air volumetric flow rate

Cited by 94 publications

References 16 publications

Ground Deposition and Airborne Spray Drift Assessment in Vineyard and Orchard: The Influence of Environmental Variables and Sprayer Settings

Ground Deposition and Airborne Spray Drift Assessment in Vineyard and Orchard: The Influence of Environmental Variables and Sprayer Settings

Limiting brown rot incidence in peach with tree training and pruning

Turboatomizador e repasse com pistola manual na cobertura de pulverização de agrotóxicos em caquizeiro (Diospyros kaki L.f.)

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