Md. Aminul Islam
Scientific Officer
OFRD, BARI, Pabna
Md. Shafiqul Islam
Principal Scientific Officer
OFRD, BARI, Pabna
Md. Akhter-Ul-Alam
Scientific Officer
OFRD, BARI, Pabna
Md. Maniruzzaman
Scientific Officer
OFRD, BARI, Pabna
Alternaria blight, Fungicide, Rovral, Menkojeb, Mustard
FSRD site Pushpopara, Pabna
Crop-Soil-Water Management
The research work was carried out at the at the FSRD site Pushpopara, Pabna during Rabi season 2012-13 with BARI Sharisha 14. The experiment was laid out in randomized complete block design with three replications. The unit plot size was 7m x 5m. The fields were fertilized with 115-33-43-27-3-3 kg N-P-K-S-Zn-B respectively. The sources of nutrient were urea, TSP, MoP, Gypsum, Zinc sulphate and Boric acid. Seeds were sown in the field dated on 22 November, 2012. All the fertilizers except urea were applied during final land preparation. Urea was divided into three equal amount of installments and 2/3 rd urea was applied as basal where as the rest 1/3 rd was applied as top dress on 23 December, 2012. Weeding was done for two times, first on 22 December, 2012 and the second one at 09 January, 2013 to control dry land weeds. Each field received irrigation on 23 December, 2012. The fields were infested with aphid. Sobicron was applied for two times on 28 January and 10 February, 2013 to control aphid. To estimate the disease severity, ten plants were selected randomly from each plot and hence tagged for scoring the infected leaves at 30, 45, 60 and 85 DAS. Three treatments i.e. T1= Spraying with Rovral, T2= Spraying with Denkojeb and T3= Spraying with fresh water (control) were considered for the experimentation. Uniform spray solution of required concentration was prepared and sprayed three times dated on 16 January, 28 January and 10 February, 2013.The crops were harvested on 20 February, 2013. The data were statistically analyzed using analysis of variance to determine the least significant difference (p<0.05) among the parameters. Finally yield loss was also calculated as percentage. Leaf blight disease severity was recorded after last spray on the basis of 0-5 disease rating scale proposed by Meah [1992].
The Scales are as Follows:
0 = leaves free from leaf spot
1 = 0.1-6% leaf or pod area diseased
2 = 6.1% - 12% leaf or pod area diseased
3 = 12.1-25% leaf or pod area diseased
4 = 25.1% -50% leaf or pod area diseased
5 = Above 50% leaf or pod area diseased
Finally percentage of disease index (PDI) was computed using the formula below:
PDI= (Total sum of rating X 100)/ (Number of leaf counted X Maximum grade)
Annual Research Report 2012-13, OFRD, BARI, Pabna
Report/Proceedings