ISHS Acta Horticulturae 422: International Conference on Integrated Fruit Production
SCAB AND MILDEW CONTROL WITH EMISSION REDUCING SPRAYERS IN APPLE GROWING |
| Authors: | B. Heijne, H.A.J. Porskamp |
| Abstract:
For integrated fruit production a reduction in contamination of the environment by pesticides is essential. With modern orchard sprayers these goals can be achieved as they are equiped to reduce emissions towards the environment. Two tunnel sprayers, one with the "Closed Loop System" and the other equiped with rotary atomisers and a cross flow sprayer with reflection shielding were tested for their emission reducing properties and biological efficacy. These sprayers were compared to a standard cross flow sprayer. These sprayers recycle part of the spray liquid (denoted as recirculation). The percentages recirculation were measured. Emission to the ground inside the orchard was measured as well as the emission to the ground in the neighbouring field. The drift to the air was measured next to the orchard. The tunnel sprayers reduced the emission to the neighbouring field with over 80 % in comparison to the standard cross flow sprayer. To compare the efficacy of the sprayers, 25 % and 75 % of the standard recommended rate of fungicides was sprayed weekly to control apple scab (Venturia inaequalis) and powdery mildew (Podosphaera leucotricha). The tunnel sprayer equiped with rotary atomisers was less effective than the other sprayers in the control of these diseases. The tunnel sprayer with "Closed Loop System" and the cross flow sprayer with reflection shielding were as effective as the standard cross flow sprayer. | |
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