Evaluation of fungicides and alternative methods for control of Rhizopus soft rot in sweetpotato, 2016

摘要

The experiment was conducted at the Central Crops Research Station in Clayton, NC. Sweetpotato roots used in the study were obtained from a commercial packing facility at the time of each inoculation and were rinsed prior to use. Roots were previouslycured and were selected based upon similar size, shape, and disease free appearance. Ten roots were used per replication in fungicide, UV-C irradiation, and static ClO2 experiments. Each of the experiments were conducted three times. Twenty-five roots were used per replication in the active ClO2 experiment. The active ClO2 experiment was conducted twice. Prior to inoculation, roots were wounded using a calibrated, rubber-band propelled wooden dowel. Roots for the fungicide and active ClO2 test were then inoculated with a 5mm mycelia plug. Roots for the UV-C irradiation and static ClO2 tests were inoculated by dipping the wounded roots into a 106 spores/mL R. stolonifer suspension. All roots were evaluated ten days post-inoculation for disease incidence. Percent disease incidence data for all treatments was analyzed in R using Pearson's %2 test. A posthoc x2 test was used for separation of treatments. P-values were adjusted using the false discovery rate method and were considered significant at 0.05.