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Pakistan Journal of Biological Sciences

Year: 2001 | Volume: 4 | Issue: 11 | Page No.: 1350-1352
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Research Article

Effect of Black Pointed Seed in Seed Sample on Leaf Spot Severity and Grain Infection of Wheat in the Field

M. M. Hossain and I. Hossain

ABSTRACT

Seed samples having different levels of black pointed seed were used in this study. Lowest leaf spot severity (3.36) was found in plots where best seed was sown in the field. Increased number of black pointed seed in the seed sample resulted in formation of higher number of seeds having black point infection in the field. Highest number (82.13 %) of grade-0 (apparently healthy) seeds were obtained from the plots where best seed was used. Formation of black pointed free grain in the field did not differ significantly up to seed sample containing 10 % black pointed seed. Laboratory test revealed that seeds of grade-5 yielded 74.55 % higher incidence of Bipolaris sorokiniana over seeds of grade-0. Incidence of Fusarium also increased with increase in black point infection but incidence of Alternaria tenuis and Curvularia lunata did not show any specific relation with severity of black point infection in grain. Higher incidence of B. sorokiniana was yielded from the embryo end of both seeds of grade-0 (25.30 %) and grade-1 (2.50 %) than the endosperm.
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