The use of Phytium oligandrum to control grey mold in raspberry

P. Krawiec, M. Krawiec
Botrytis cinerea Pers. is a pathogen widely known to cause grey mold in raspberry. The typical control program against grey mold is largely based on the application of fungicides at the onset of blossom. Such prevention method, however, can lead to the growth of resistant strains of B. cinerea. An alternative way is to replace chemical fungicides with biological ones which may decrease the development of resistance. The experiments were performed in East Poland in 2013 and 2014. They involved the application of primocane-fruiting raspberry cultivar 'Polana' in a commercial plantation. The trials showed that the risk of B. cinerea infection (according to the iMetos Grey Mold Disease Model) in 2013, during blossom, varied from 0 to 56%. In 2014, the danger of such infection was very high (18-90%). Two protectant programs to control B. cinerea were tested, involving the application of Polyversum WP (Phytium oligandrum). The “chemical standard” program against B. cinerea was based on three fungicide applications during the first year, and four fungicide sprays during blossom in the following year. In 2013, the “biological program” consisted of one standard fungicide spray plus two sprays of Polyversum WP (at 0.15 kg ha‑1) at blooming time. In 2014, the first spray application during blossom included a standard fungicide, and three following Polyversum WP. The efficacy of the “biological program” was not considerably different from the “chemical standard” in both years. The use of Polyversum WP in the biological strategy can decrease the amount of chemical sprays in controlling raspberry grey mold and chemical residues on harvested fruit.
Krawiec, P. and Krawiec, M. (2020). The use of Phytium oligandrum to control grey mold in raspberry. Acta Hortic. 1277, 413-416
DOI: 10.17660/ActaHortic.2020.1277.59
raspberry, Botrytis cinerea, fungicide resistance, Phytium oligandrum, Polyversum, biocontrol agent

Acta Horticulturae