Green Global
Foundation   Journal
...an emerging window for scientific research and publication across the globe

EFFECT OF DIFFERENT LEVELS OF SEED INFECTION WITH BLACK POINT (Bipolaris sorokiniana) AND POPULATION DENSITY ON THE LEAF BLIGHT SEVERITY AND YIELD ATTRIBUTES OF WHEAT (Pages : 10 - 20)

The experiment was conducted to find out the effect of seed infection levels and population density on leaf blight severity and yield of wheat. Three population density viz. 200 seeds/m2, 300 seeds/m2 and 400 seeds/m2 and six seed infection levels viz. 0%, 5.1-15%, 15.1-25%, 25.1-35%, 35.1-45% and 45.1-60% were used. Maximum leaf spot severity in flag leaf stage (0.36), panicle initiation stage (0.64), flowering stage (1.57), milk stage (1.84) and hard dough stage (2.30) was found in the interaction between sowing seeds @ 400 seeds/m2 with 45.1-60% seed infection level. In every growth stage of the plant significantly lower leaf blight severity was recorded in the interaction between 200 seeds/m2 with sowing of 0.0% infected seeds. Similar trends in disease severity were recorded on penultimate leaf in above mentioned growth stage. Significantly higher number of grains/ear (58.00) and healthy grains/ear (55.67) was recorded in 0% seed infection with a seed rate of 200 seeds/m2. Lower number of diseased grains/ear (2.33) were recorded in 45-60% seed contamination with 400 seeds/m2 and 0% seed contamination with 200 seeds/m2. Weight of diseased grains/ear ranged from 0.07 g to 0.75 g where the lowest value was recorded under 0% seed contamination X 200 seeds/m2 treatment combination. Significantly higher (45.60) grain weight of 1000 seeds was recorded with the treatments 0% seed infection with a seed rate of 200 seeds/m2. Straw yield under different treatment combinations ranged from 3.17-4.21 t/ha where the highest straw yield was obtained under the treatment combination of T1 X 200 seeds/m2. Grain yield was the highest (3.43 t/ha) when healthy seeds (0% infection) were sown @ 200 seeds/m2. Download