ISHS Acta Horticulturae 422: International Conference on Integrated Fruit Production
COMPARISON OF APPLE SCAB CONTROL WITH TRADITIONAL AND TUNNEL SPRAYERS AT FULL AND REDUCED CHEMICAL RATES |
| Authors: | R. Holownicki, W. Goszczynski, G. Doruchowski, H. Nowacka |
| Keywords: | tunnel sprayer, apple orchard, apple scab, biological efficacy |
| Abstract:
Biological efficacy of apple scab (Venturia inaequalis) control on Gloster/P2 - 4,0 x 2,5 m was evaluated for three sprayers: tunnel with directed air-jet discharge system, tunnel with cross flow fans and standard directed air-jet sprayer. The trees were treated 7 times at spray volume 250 1/ha and 100 %, 50 %, 25 % rates of chemicals. The percentage of leaves infected by apple scab was 1,2 - 3,4 % for the tunnel sprayers and 0,2 – 0,5 % for directed standard air-jet sprayer. The difference in scab control efficacy for the sprayers may be explained by different air-jet discharge system affecting spray deposit pattern in the tree canopy. | |
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