Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Occurrence of false smut (Ustilaginoidea virens) in rice field of Mazandaran.

Abstract

Symptoms of large, black, ball-shaped grains on panicles of several rice cultivars (Khazar, Nemat, Neda) were observed in August 1997 in a village of Bandpai-Sharghi district, Otagh-Sara of Babol, Mazandaran, Iran. It was noted that only a few grains were usually infected in each panicle, with the other grains smaller than those in healthy panicles. Infected grains were yellowish-orange initially, turning olive green and then black. Each infected grain contained chlamydospores, 4-7 μm diameter. The causal agent was identified as Ustilaginoidea virens; this is a new record for the mycota of Iran. This disease was not observed on any other plants (Poaceae) in the infested area.