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

EFFECT OF SEED INFECTION LEVELS AND POPULATION DENSITY ON SEEDLING INFECTION AND INCIDENCE OF Bipolaris sorokiniana OF WHEAT CV. SHATABDI (Pages : 22 - 30)

An experiment was conducted during March 2010-April 2011 to find out the influence of seed infection level by Bipolaris sorokiniana and population density on leaf blight development, healthy seed production and yield of wheat, cv. shatabdi. The seed infection level and the population density influenced the pathogenic activities through creating microclimate variability that modify the leaf blight/spot development by Bipolaris sorokiniana of wheat, six different seed infection levels viz.T1= 0%, T2 = 5.1-15%, T3 = 15.1-25%, T4 = 25.1-35%, T5 = 35.1-45%, T6 = 45.1-60% were tested. Using three different method namely blotter method, water agar method and rolled paper towel method the germination percentage, normal seedling percentage and vigor index was maximum at 0% seed infection and minimum at 45.1-60% seed infection. Number of infected seedlings and dead seed was higher at maximum seed infection level and lower at 0% seed infection level. In green house tray method seed germination and vigor index decreased with the increase of seed infection level by Bipolaris sorokiniana. Different seed infection increased the severity of Bipolaris sorokiniana up to 45.1-60% seed infection. Population density and seed infection levels had significant influence on plant growth parameters and yield and yield contributing character. Population density 300 seeds/m2 showed best performance in case of grain and straw yield. The highest grain yield (2.64 t/ha) and straw yield (6.87 t/ha) was obtained from 300 seeds/m2 population density. The highest grain yield (3.14 t/ha) was also produced from 0% seed infection, whereas, 45.1-60% seed infection produced the lowest grain yield (1.04 t/ha). The highest straw yield was observed with 300 seeds/m2 and the lowest from 200 seeds/m2. The influence of the development of leaf blight disease of wheat by Bipolaris sorokiniana with increased plant density attributed to favorable microclimate produced in the field condition.Download