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Spatial Pattern of Natural Spread of Rice False Smut (ustilaginoideavirens) Disease in Fields

Bodrun Nesa
Senior Scientific Officer
Plant Pathology Division, Bangladesh Rice Research Institute, Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

The aim of this work was to try to understand what major factors driving Rice false Smut (RFSm) epidemics in the ecosystem under study. Data for this study were collected from the experimental farm, called “West Byde”, of the Bangladesh Rice Research Institute (BRRI), Gazipur, Bangladesh, located at 23°59? N latitude, 90°24? E longitude. Results showed that the spread of the disease was not similar between and within the fields and some fields were almost disease free (Fig. 1). RFSm recorded aggregation in spaces in most of the fields, but the location of this aggregation differed between the fields. Symptom was recorded on panicles in regenerated tillers from harvested main crop (otherwise known as ratoons). The disease was tended to be prominent towards proximity of drainage channels. The probability of occurring one diseased tiller per hill was calculated as 73% and cumulative probability of four or less smut balls per diseased panicle as little over 60%. This study established that soil is the absolute dominant source of initiation of the epidemic. The analysis did not find evidence of any long- or short-distance primary and/or secondary sources of infection. It is concluded that the disease management be directed specific to the fields at risk. It suggests development of a soil testing tool for quantifying inoculum potential in a field to ascertain the risk. With the discovery of symptom on ratoons, this highlights the need for fresh thinking on identifying the pathway of entry of the pathogen into the plant.

Keywords: Rice, Spatial pattern, Natural spread, False smut disease

Location: BRRI Farm, Gazipur

Start Date: 01-07-2014

End Date: 30-06-2015

Program Area: Pest Management

Commodity: Rice

Objectives:

To understand what major factors driving Rice false Smut (RFSm) epidemics in the ecosystem under study.

Methodology:

Data for this study were collected from the experimental farm, called “West Byde”, of the Bangladesh Rice Research Institute (BRRI), Gazipur, Bangladesh, located at 23°59? N latitude, 90°24? E longitude. This farm has built up as an intensive rice-ecosystem in the last 40 years growing as many as three rice crops annually in 88 fields spread over 35 hectare area. Both conventional and specialized statistical methods were applied in data analysis.

Source of Information: BRRI Annual Report 2014-15.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study established that soil is the absolute dominant source of initiation of the epidemic. The analysis did not find evidence of any long- or short-distance primary and/or secondary sources of infection. It is concluded that the disease management be directed specific to the fields at risk. It suggests development of a soil testing tool for quantifying inoculum potential in a field to ascertain the risk. With the discovery of symptom on ratoons, this highlights the need for fresh thinking on identifying the pathway of entry of the pathogen into the plant.

Knowledge Management: Report/Proceedings