ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

The effect of wounding, temperature, and inoculum on the development of pink rot of potatoes caused by Phytophthora erythroseptica.

Salas, B., Stack, R. W., Secor, G. A. and Gudmestad, N. C.

Plant Disease Year: 2000 Vol: 84 Issue: 12 Pages: 1327-1333 Ref: 30 ref.

2000

บทคัดย่อ

The effect of wounding, temperature, and inoculum on the development of pink rot caused by Phytophthora erythroseptica, was studied for its potential impact on postharvest infection. Tissue plugs cut from pink rot infected tubers and plugs of similar size from laboratory cultures of the pathogen were highly effective inoculum sources on wounded tubers. Severe wounding, temperatures of 15 to 25 deg C, and high inoculum density affected the infection risk. Regardless of source or amount of inoculum, any degree of wounding greatly increased incidence of infection of tubers by P. erythroseptica. Infections in unwounded tubers started at 15 deg C, whereas in wounded tubers infection started at 10 deg C. Incidence of pink rot was high when two or three of the factors (severe wounding, high temperature, high inoculum level) were favourable. Incidence of pink rot was intermediate when only one factor was favourable. Incidence of pink rot was low or absent without a favourable factor (no wounding, low te

mperature, and low inoculum). Since infected tuber tissue may serve as potential inoculum source for postharvest infection of tubers by P. erythroseptica, the removal of pink rot infected tubers at harvest is desirable. Avoidance of wounding and rapid cooling of storage bins to 10 deg C may also help control pink rot.