Preventative and curative applications of carbonates against apple scab (Venturia inaequalis) in organic apple orchards
Kelderer, M.; Casera, C.; Lardschneider, E; La Torre, A.
14th International Conference on Organic Fruit Growing, Universitat hohenheim (Germany), february 22 to 24, 2010
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Foerdergemeinschaft Oekologischer Obstbau e V.
|Abstract in Italian:|
|Abstract in English:|
In the EC, for a long time, only copper- and sulphur-based products were allowed to control
a variety of diseases on different crops. However, it is well-known that these products also
have negative side effects on beneficial organisms and the soil. For many years
researchers have been looking for alternatives to reduce their use and /or replace them.
Different carbonates have been investigated intensively in the last years. They are present
in nature and were used in the past in organic farming. With Decree 404/2008, Annex II of
Regulation (EEC) No. 2092/91 was updated and potassium bicarbonate (PBC) was
included into the list of active substances allowed in organic farming. On 1 January 2009,
potassium bicarbonate was also included into Annex I of Council Directive 91/414/EEC
concerning the placing of plant protection products on the market.
Field trials carried out from 2003 to 2009 in South Tyrol evidenced an interesting efficacy of
carbonate-based products against apple scab and other diseases, but also phytotoxic side
effects emerged depending on the formulation and the applied rate. First results were
presented in the proceedings of the 12th and 13th Ecofruit conference. The results of recent
field trials are presented, which aimed at evaluating the efficacy of different carbonatebased
products in stopping further apple scab development and thus their curative action.