First report of Phytophthora sp. causing a root and basal stem rot of narrowleaf lupin in Australia

摘要

A root and basal stem rot disease has occurred in narrowleaf lupin (Lupinus angustifolius) in New Sourht Wales (NSW) since at least 993. Leaves of affected plants wilt, become chlorotic and fall. Symptom progression is acropetal and plants die within a few days. Taproots are completely rotted with a dark-brown to black sunken lesion frequently extending up the stem. Symptoms develop usually at pd filling.