Trapman, Marc; Tamm, Lucius and Fuchs, Jacques G. (2004) The effectiveness of winter treatments with copper or lime sulphur to control Sooty Blotch on apple. In: Boos, Markus (Ed.) Ecofruit - 11th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing: Proceedings to the Conference from 3rd February to 5th February 2004 at Weinsberg/Germany, pp. 67-72.
In 2002 and 2003 two randomized trials and three “on farm” trials where carried out
to test the hypothesis that a single winter treatment could reduce the primary
inoculum of Sooty Blotch sufficiently to prevent fruit disease during summer.
copperoxychloride (0.2%-0.4%) and lime sulfur (4.0%-5.0%) were applied until run-off
in March shortly before bud break. Assessments of Sooty Blotch incidence and
severity where made immediately after harvest.
The winter treatments with copperoxychloride did reduce disease severity during
summer in one case. The treatments with lime sulfur reduced the disease level in
three sites to some extent. However, winter treatments alone were not nearly as
efficient as summer treatments. Therefore, we see no reason to advise this kind of
treatment with lime sulfur in practice as the effectiveness is poor, the necessary
spray cover can not be reached under practical conditions, and with the amount of
material needed for this single spray five sprays can be made in summer that will be
more effective to control the disease.
|EPrint Type:||Conference paper, poster, etc.|
|Type of presentation:||Paper|
|Subjects:|| Crop husbandry > Crop health, quality, protection|
Crop husbandry > Production systems > Fruit and berries
|Research affiliation:||International Conferences > 2006: Ecofruit|
|Deposited By:||Tagung, Ecofruit|
|Deposited On:||18 Sep 2008|
|Last Modified:||12 Apr 2010 07:37|
|Refereed:||Peer-reviewed and accepted|
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