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ULV Application to a Tree Crop Canopy: Evaluation of Physical Performance and Penetration

Published online by Cambridge University Press:  19 September 2011

Kwame Afreh-Nuamah  and
E. W. Thornhill
Kwame Afreh-Nuamah
Affiliation:
International Pesticide Application Research Centre, Imperial College at Silwood Park, Ascot, Berkshire SL5 7P
E. W. Thornhill
Affiliation:
International Pesticide Application Research Centre, Imperial College at Silwood Park, Ascot, Berkshire SL5 7P
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Abstract

Spray distribution in an apple tree canopy using an adapted knapsack mistblower fitted with a spinning disc, with the provision of an induced electrostatic charge on the droplets was studied.

Droplets were sampled using uvitex fluorescent tracer on Kromekote cards positioned in different areas of the canopy.

Droplets were highest on the outer surface and decreased sharply into the canopy. Uncharged spray droplets gave the poorer deposition with better distribution, but by adding an electrostatic charge, droplet deposition was significantly improved in the outer parts of the canopy. An average of 3 ml/tree of spray liquid was used in all applications. The larger variety (Red Victoria) required about 50% more spray liquid, but distribution was still lower than that achieved by the smaller Keswick variety.

Résumé

Une étude a été faite sur la distribution dans la pulvérisation de la cime d'un pommier en utilisant un pulvérisateur à dos adapté, avec un gicleur ayant un aménagement pour l'induction de charges électro-statiques des gouttelettes.

Les gouttelettes ont été analysées à l'aide d'un tracer fluorescent Uvitex sur des cartes kromekote positionées dans des places différentes de la cime du pommier.

La déposition qui était plus supérieure dans la surface extérieure décroissait brusquement dans la surface intérieure de la cime. Les gouttelettes non-chargées malgré leur faibre déposition avaient la meilleure distribution. Cependant, par le rajout des charges électro-statique, la déposition des gouttelettes était amméliorée d'une manière remarquable dans les parties extérieures de la cime du pommier. En moyenne, 3 ml/arbre de solution étaient utilisés dans toute les application. Les arbres connaissaient une baisse progressive de pulvérisation, et en conséquence, une faibre déposition, sur charque unité de surface des feuilles au fur et à mesure que l'étendue de la cime ou la taille de l'arbre accroissaient, cette déposition, par contre, étaint presque nulle dans les parties selon qu'ils soient loin ou qu'ils soient protégés du pulvériseur.

Keywords

Ultra low volume (ULV)spinning discdropletstree cropcanopydistribution
Type
Research Article
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 5 , October 1988 , pp. 629 - 634
Copyright
Copyright © ICIPE 1988

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References

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