Effect of plant age, leaf position and leaf segment on infection of leek by leek rust, Puccinia allii

摘要: Potted plants of leek, Allium porrum cv. Musselburgh, were inoculated with urediniospores leek rust, Puccinia alliii, and maintained for 21 days in a controlled-environment cabinet. Mean pustule density, mean length colony all decreased increasing plant age, from 2 to 8 months old, there was tendency latent period increase age. On 8-month-old development continued over post-inoculation but the proportion flecks developing into pustules remained below 50%. In non-tip portions leaves, density increased upper lower leaves standing crop. Tip either varied less resistance leaf position or showed random variation.