Reducing russeting of organically grown Elstar to increase quality

    Research output: Chapter in Book/Report/Conference proceedingConference paper

    Abstract

    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.
    Original languageEnglish
    Title of host publicationProceedings of the 13th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing. Proceedings of the conference
    Place of PublicationWeinsberg, Germany
    PublisherFordergemeinschaft Okologischer Obstbau e.V. (FOKO)
    Pages54-58
    Publication statusPublished - 2008
    Event13th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing -
    Duration: 18 Feb 200820 Feb 2008

    Conference

    Conference13th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing
    Period18/02/0820/02/08

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    de Jong, P. F., & van der Maas, M. P. (2008). Reducing russeting of organically grown Elstar to increase quality. In Proceedings of the 13th International Conference on Cultivation Technique and Phytopathological Problems in Organic Fruit-Growing. Proceedings of the conference (pp. 54-58). Weinsberg, Germany: Fordergemeinschaft Okologischer Obstbau e.V. (FOKO).