Effect of Bipolaris sorokiniana leaf blight on some yield components and seed quality of wheat [in Bangladesh]
1994
Rashid, A.Q.M.B. | Lahiri, B.P. | Islam, T. (Bangladesh Agricultural Univ. Mymensingh (Bangladesh). Dept. of Plant Pathology)
The effect of Bipolaris sorokiniana infection causing leaf blight on some yield components and seed quality of five susceptible and highly susceptible cultivars of wheat were studied. Natural and induced epiphytotic field conditions were used. Relationship of the field incidence of leaf blight caused by the pathogen to its subsequent effects on seed quality was determined. No significant difference was found between leaf blight in inoculated plants at pre-ear emergence and post-ear emergence. But both the treatments had significantly higher effects on the disease development than that in the naturally infected plants. Artificial inoculation at pre-ear emergence attributed to maximum reduction in different yield components measured. Corresponding to the maximum disease index (83.52%), the cv. MSl suffered most than other cvs. significantly reducing length of ear (8.44cm.), number of grain per ear (30.54), 1000 grain weight (30.57 g) and single tiller weight (1.07 g), and induced maximum seed-borne infection and insignificantly increased protein content of seeds. The pathogen caused reduction of seed germination up to 59.40 to 75.80%. A comparison between leaf blight incidence in the field and quality assessments of the seeds in laboratory has been presented.
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