1. Abbott WS, 1925. A method of computing the effectiveness of an insecticide. J Econ Entomol 18, 265–267.
2. AMI, 2009. Marktbilanz Kartoffeln 2009, Agrar Informations Gesellschaft mbH, Bonn.
3. Anonymous, 2002. Efficacy evaluation of fungicides Phytophthora infestans on potato. Eur. Mediterr. Plant Prot. Org.
4. Anonymous, 2005. European cultivated potato database. Variety descriptions for cv. DITTA. ( http://www.europotato.org , 5.10.2009).
5. Anonymous, 2008. Commission Regulation (EC) No 889/2008 of 5 September 2008 laying down detailed rules for the implementation of Council Regulation (EC) No 834/2007 on organic production and labelling of organic products with regard to organic production, labelling and control. ( http://www.ec.europa.eu /agriculture/organic/organicfarming/what-organic_en, 09.01.2010).