The transmission ofPhoma lingam(Tode) Desm. in the seeds of swede, turnip, chou moellier, rape, and kale

摘要

In 1957 and 1958 a survey was made of the seed-borne infection ofPhoma lingamin swede, turnip, chou moellier, rape, and kale seeds. Of the 263 seed samples tested, 223 were free from seed infection. Most of the samples with diseased seed had less than 0.1 % infection. Details are given of a technique for detecting seed-borne infection ofP. lingamin brassicas. The seeds were surface sterilised and placed on tap-water agar in petri dishes with 2,000 p.p.m. acid equivalent of 2,4-D in the medium, and the dishes incubated at 23°C for 12 days.