A logistic model was
fitted to assess disease intensity and disease index data. This model is given by the
following equations: Disease Intensity =
100(∑ sn/SN) and Disease Index = ∑sn/N,
where sis the disease score (disease was
rated on a scale of 0 to 5, where 0 = no
symptoms and 5 = severe symptoms), Sis
the highest sgrade, nis number of plants
with the same s,and Nis total number of
test plants indexed. Disease incidence was
calculated according to the following
equation: Disease Incidence = 100(No. of
infected plants/No. of tested plants). The
analysis of variance (ANOVA) was performed on yield data with the SAS general
linear models (GLM) procedure (SAS
Institute, Cary, NC) and Student’sttest.
A logistic model was
fitted to assess disease intensity and disease index data. This model is given by the
following equations: Disease Intensity =
100(∑ sn/SN) and Disease Index = ∑sn/N,
where sis the disease score (disease was
rated on a scale of 0 to 5, where 0 = no
symptoms and 5 = severe symptoms), Sis
the highest sgrade, nis number of plants
with the same s,and Nis total number of
test plants indexed. Disease incidence was
calculated according to the following
equation: Disease Incidence = 100(No. of
infected plants/No. of tested plants). The
analysis of variance (ANOVA) was performed on yield data with the SAS general
linear models (GLM) procedure (SAS
Institute, Cary, NC) and Student’sttest.
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