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    • Masters Thesis
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    •   HSTUL IR
    • Faculty of Agriculture
    • Dept. of Plant Pathology
    • Masters Thesis
    • View Item
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    DATE OF SOWING AND VARIETAL REACTION AGAINST BIPOLARIS SOROKINIANA CAUSING LEAF BLIGHT OF WHEAT

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    MOHAMUD AWEIS AHMED Student No. 1605576 Session: 2016-2017 (3.415Mb)
    Date
    2017-12
    Author
    AHMED, MOHAMUD AWEIS
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    URI
    http://localhost:8080/xmlui/handle/123456789/1522
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    • Masters Thesis
    Abstract
    A field experiment was design to evaluate the effect of some varieties and dates of sowing on the Bipolaris leaf and head blight disease of wheat caused by Bipolaris sorokiniana at the Central Farm of WRC, BARI, Noshipur, Dinajpur duing the period of 2016-17. There six varieties viz. BARI Gom 21 (Shatabdi), BARI Gom 26, BARI Gom 27, BARI Gom 28, BARI Gom 29 and BARI Gom 30, and five dates of sowing (DAS) were viz. November 15, December 01, December 15, January 01 and January 15. The experiment was laid out in a Spilt Plot Design with three replications. The variety was set in the main plot and the sowing date was placed in sub plot. Data were collected on percent leaf blight severity and percent infected head blight at 35, 45 and 55 DAS and seed yield data after processing. The effect of variety on percent leaf blight severity of wheat at different days after sowing were found significant. The final data on leaf blight seveity at 55 DAS, the highest percent leaf blight severity (68.09%) was found in BARI Gom 30 and lowest (38.73%) was recorded in BARI Gom 21 whereas in case of sowing date, the highest (59.73%) leaf blight severity was found in Jan 01 while the lowest (52.49%) was recorded in Nov 15. In the percent head blight infection, the highest (5.06%) head blight was found in BARI Gom 28 and the lowest (3.56%) infected head blight was recorded in BARI Gom 21. Response to date of sowing, the highest (5.17%) infected head blight was found in Jan15, while the lowest (3.23%) infected head blight was recorded in Nov 15. The seed health test by dry inspection and blotter method were done for each variety and each date of sowing. 400 seeds were taken as representative sample of each variety and tested their health status by dry inspection method and found that the highest percent of infected seeds 5.15% was found in seed sample of BARI Gom 29 the lowest in BARI Gom (26 3.51). In connection of five dates of sowing, the highest percent of infected seeds (4.69.15%) was found in seed sample of Dec. 15 and the lowest (4.04%) in Nov. 15. The seed samples tested by blotter method, the highest percent of infected seeds (3.60%) was found in seed sample of BARI Gom 28 and the lowest (2.53%) in BARI Gom 27. Considering the date of sowing, the highest percent of infected seeds 3.37% was found in Dec. 15 and the lowest (2.87%) in Nov. 15. In yield parameter, the highest yield was recorded in BARI Gom 26 (59.54 kg/plot) followed by BARI Gom 21 (56.30 kg/plot). The lowest grain yield was found in BARI Gom 27 (53.87kg/plot). Regarding the date of sowing, the highest yield was found in Nov. 15 (68.73kg/plot) sowing and the lowest in January 15 (48.86kg/plot). In the regression coefficient and R2 value between the leaf blight, head blight, seed infection and yield as dependent and sowing date as independent variables were assessed and found some known and many unknown factors might be involved in disease development. These research findings in turns concluded overall that varieties have little significant difference in disease severity but BARI Gom 21 performed better whereas date of sowing has strong and closer links in disease severity where November 15 may be employed to follow.

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