Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Longevity and location of two Alternaria spp. in cauliflower seed during storage.

Abstract

Infected seeds of cauliflower cv. Pant Gobhi 4 were examined immediately after harvest by deep free method for the prevalence of fungi. Seeds were further separated into 2 lots for storage studies at room temperature (8-38°C) and in cold storage (5±2°C). The recovery of fungi on seeds was observed at monthly intervals from April 1999 to November 2000. Seeds collected were categorized as trace, mild, moderate and severely infected. Healthy seeds were also taken from healthy siliquae. Seed infection of Alternaria brassicicola was 36.3%, which was higher compared to infection of A. brassicae (28.8%), immediately after harvest. At room temperature, with the increase in storage period, there was a significant reduction in recovery of A. brassicae and A. brassicicola in seeds. A. brassicicola infection was completely eliminated in the end of August 1999, i.e. 5 months after storage, while A. brassicae after 7 months of storage (November 1999). At 5±2°C storage temperature, the recovery of per cent seed infection of A. brassicae and A. brassicicola went on decreasing steadily with the increase in storage period. The subsequent reduction in seed infection was observed at monthly interval. The seedborne inoculum of A. brassicae and A. brassicicola reduced to a minimum of 9.5 and 9%, respectively, in the end of storage period, i.e. November 2000 (20 months after storage).