DS and DI were estimated three times at 15 day
intervals beginning 7 days after the initial spray
treatment. At maturity, 25 rice plants were randomly
selected from the middle part of each plot, leaving
two rows each side to avoid border effects. Plant
height, panicle length, number of panicle branches,
and number of grains per panicle were determined.
Rice grains harvested from all treatments were
subjected to the standard blotter method [21] and
evaluated for the incidence of B. oryzae. Photosynthetic
pigments (chlorophyll a, chlorophyll b, and
carotenoids) were estimated in the leaves using the
spectrophotometric method of Harborne [17]. Rice
grains were dried in an oven at 808C to a constant
weight and ground to a fine powder with an electric
DS and DI were estimated three times at 15 dayintervals beginning 7 days after the initial spraytreatment. At maturity, 25 rice plants were randomlyselected from the middle part of each plot, leavingtwo rows each side to avoid border effects. Plantheight, panicle length, number of panicle branches,and number of grains per panicle were determined.Rice grains harvested from all treatments weresubjected to the standard blotter method [21] andevaluated for the incidence of B. oryzae. Photosyntheticpigments (chlorophyll a, chlorophyll b, andcarotenoids) were estimated in the leaves using thespectrophotometric method of Harborne [17]. Ricegrains were dried in an oven at 808C to a constantweight and ground to a fine powder with an electric
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