Abstract
Aim:
To assess yield loss in different rice varieties due to rice bakanae disease
and to understand the role of weather parameters on disease incidence and
losses.
Methodology: Roving survey and surveillance was carried out for
three consecutive years to assess the status of rice bakanae disease among
twenty popular rice varieties growing in Eastern India. Field experiment was
conducted for three successive years, i.e., 2016, 2017 and 2018 at Cuttack.
Highly susceptible variety Pooja was selected for the experiment. Data on
disease incidence was collected daily from 10 days after transplanting to
harvesting stage and data were recorded at standard meteorological week.
Correlation was performed to find the effect of different weather parameters
on the incidence of bakanae disease on rice.
Results:
Disease being seed borne caused significant reduction in yield and quality.
The maximum disease incidence was recorded in Pooja with 18.25, 28.50 and
40.25 per cent in three years. The same variety showed maximum yield loss of
35.26 per cent compared all other varieties. The data on relationship of
bakanae disease incidence with weather parameters showed that the rainfall
(-0.444) had significant negative correlation during 2018, while RH (0.525
and 0.606) had significant positive correlation during 2017 and 2018.
Interpretation: This study gives some information for
formulating breeding programs to develop resistant varieties and management
measures for preventing Bakanae disease.
Key words: Bakanae disease, Fusarium fujikuroi, Weather
parameters
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