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ISHS Acta Horticulturae 1133: XI International Rubus and Ribes Symposium

The use of laminarin as an effective tool for anti-resistance management in chemical control of grey mould in raspberry

Authors:   P. Krawiec, M. Krawiec, I. Szot
Keywords:   raspberry, Botrytis cinerea, fungicide resistance, Vaxiplant
DOI:   10.17660/ActaHortic.2016.1133.71
One of the main pathogens of raspberry plants, causing grey mould is Botrytis cinerea Pers. An effective control of grey mould is usually based on preventive, repeated fungicide applications during the blossom and the beginning of harvest. However, this strategy may contribute to the increase in the number of B. cinerea resistant strains. The replacement of chemical fungicides by laminarin can reduce the phenomenon of B. cinerea resistance. Two studies were conducted in a commercial raspberry plantation of R. idaeus 'Polana' grown in east Poland, where several protection programs to eradicate B. cinerea by application of Vaxiplant SL (5% laminarin) were tested. In 2013 a risk of B. cinerea infection during blossom was between 0 and 56% (according to iMetos Grey Mould Disease Model), while in 2014, a risk of its infection was very high (18-90%). The standard program against B. cinerea consisted of three fungicide sprays in the first year, and four fungicide applications during the blossom, the following year. The laminarin program was composed with one standard fungicide spray plus two sprays of Vaxiplant SL (at 1.0 L ha-1) at blooming, and then four times of Vaxiplant SL during harvest. In 2014 spray applications during blossom were made twice with standard fungicides and four times with Vaxiplant SL; during harvest laminarin was used twice. The efficacy of the laminarin program did not significantly differ from the standard program applied in both years, however, it reduced the number of chemical sprays in controlling of raspberry grey mould.

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