Inhibition of disease development in strawberry flowers inoculated with a mixture of Botrytis cinerea conidia and chitooligosaccharides (CHOS DPn 23) and/or synthetic fungicides.

Disease development and protection index were scored as in Table 3. The synergistic effect was calculated by determining the ratio between the observed efficacy Eobs (% inhibition) and the expected efficacy (Eexp) (see materials and methods). An Eobs/Eexp value of 1 indicates additivity, while Eobs/Eexp>1 indicates synergy.aThe recommended doses for the synthetic fungicides are 1500, 500, 1000 and 1000 μg mL−1 for Teldor, Switch, Amistar and Signum, respectively.bAll data are the mean of two experiments ± standard deviation, with 6×3 flowers in each treatment.cThe AUDPC was used to calculate the protection index.dConidia in sterile water.