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Reducing russeting of organically grown Elstar to increase quality

Jong, P.F. and van der Maas, M. P. (2008) Reducing russeting of organically grown Elstar to increase quality. In: Boos, Markus (Ed.) Ecofruit - 13th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing: Proceedings to the Conference from 18thFebruary to 20th February 2008 at Weinsberg/Germany, pp. 54-58.

[thumbnail of 054-058.pdf] PDF - German/Deutsch


Sales organisations indicated that opportunities for organic apples sales can increase
when quality increases, in particular reducing the amount of russeting.
The use of copper is probably the most important factor for russeting. Therefore a worst
case scheme was compared with a scheme with reduced copper application. Furthermore,
there was a particular interest in the effects on russeting of potassium bicarbonate
(Armicarb) because this product might be an important element in a copper free fungicide
scheme. Application of Armicarb was investigated on wet or dry canopy and effects of two
different dosages were studied. All the schemes were compared with a worst case organic
fungicide scheme with copper. The experiment was done on two year old Elstar trees
because Elstar is the most important organically grown cultivar in the Netherlands. Effects
of the schedules on russet and scab control were evaluated. At harvest no effects were
found on scab. Between the different schemes with copper no differences were found in
amount of russet. Only the highest dosage of Armicarb (10 kg/ha) and the schedules with
Armicarb on a wet canopy gave more russet compared with the worst case scheme. Also
effects on fruit rot were evaluated.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Paper
Keywords:apple, potassium bicarbonate, Armicarb, copper, scab
Subjects: Crop husbandry > Crop health, quality, protection
Crop husbandry > Production systems > Fruit and berries
Research affiliation: International Conferences > 2008: Ecofruit
Related Links:http://www.ecofruit.net
Deposited By: Tagung, Ecofruit
ID Code:13643
Deposited On:05 Aug 2008
Last Modified:12 Apr 2010 07:37
Document Language:English
Refereed:Peer-reviewed and accepted

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