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Epidemiology of Stemphylium Blight of Lentil

M. Ihsanul Huq
RARS, Rahmatpur, Barisal

A. Z. M. Nowsher Ali Khanb
Department of Botany, Dhaka University, Dhaka. Bangladesh.

Abstract/ Executive Summary:

Among the atmospheric factors maximum and minimum temperature, relative humidity ranging from 20.5-29.0^OC (mean 23.7^OC), 5.4-13.3^OC (mean 14.2^OC) and 78.0-84.5% (mean 81.0%), 48.0-63.0% (mean 55.5%) respectively are the predisposing factors for disease initiation. Whereas the maximum and minimum temperature, relative humidity ranging from 20.5-35.0^OC and 13.0-21.0^OC, 78.0 - 100.0% and 48.0-80.2% respectively and rainfall 1.2-14.6mm are favorable for disease development. The trends of disease development among the sowing dates were similar. The lowest and the highest severity were noted on November 01 and December 30 respectively.

Keywords: Epidemiology, Stemphylium blight, Lentil and Meteorological factor.

Location: Regional Agricultural Research Station, Rahmatpur, Barisal.

Start Date: 00-00-1998

End Date: 00-00-2001

Program Area: Pest Management

Commodity: Lentil

Objectives:

To study the forecasting of the disease during the crop season and to study the onset of disease in relation to atmospheric temperature, relative humidity, cloudy cover and different micro-climatic factors the present experiment has been designed.

Methodology:

The experiment was conducted during rabi of 1998-1999, 1999-2000 and 2000-2001 at Regional Agricultural Research Station, Rahmatpur, Barisal. The experiment was laid out in a well managed piece of land using Completely Randomized Block Design having three replications. The unit plot size was 4m x 3m with 25cm row to row spacing. Continuous seed sowing was done in the rows. The chemical properties and nutritional status of the experimental field was determined. The texture of soil of the experiment al plot was clay loam with low organic matter content (0.98-1.21) and acidic nature with pH 6.8. Asusceptible genotype L - 81124 was sown on different dates, viz., November 01, 10, 20, 30, December 10, 20 and 30. After completion of the sowing, the experiment was kept under constant watch from sowing up to harvest. The data on meteorological factors such as atmospheric temperature, relative humidity, rainfall and cloudy cover with corresponding sowing dates were recorded. The disease data were recorded from 25 randomly tagged plants/plot on the basis of 1-9 scoring scale. The Percent Disease Index (PDI) was computed on the basis of the recorded data according to the formula described (Wheeler, 1969).All data were analyzed statistically and the means of treatment effect were separated for DMRT (Steele and Torrie, 1980). All percent data were subjected to arcsine transformation before statistical analysis.

Source of Information: Bangladesh J. Sci. Ind. Res. 43(4), 513-520, 2008

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present findings differed from the observation of (Sinha and Singh, 1991) because, among the years the mean PDI was the highest in 1998-1999 when number of cloudy days was less, whereas in 1999-2000 the numbers of cloudy days was more but the mean PDI was low. However, number of cloudy days did not have influence on disease development under Bangladesh condition. Prevailing higher relative humidity because of the periodic rainfall and ambient temperature during crop season (November 01-December 30) were responsible for disease appearance and development under Bangladesh condition. In India it was found that relative humidity and precipitation were more important than temperature (Sindhan and Bose, 1981). Present findings were also in support of this opinion.

Knowledge Management: Journal