Abstract
The field experiments were conducted during three kharif seasons 2012, 2013 and 2014 to study the effect of meteorological parameters on brown leaf spot of rice under different transplanting dates, methods and plant population. The experiment was laid out in split-split plot design with two transplanting dates (15th June and 30th June) in main plots, three methods of planting (conventional, SRI and furrow) in sub plots and two plant population (625 and 300 plants per m2) in sub-sub plots with three replications. The brown leaf spot incidence was recorded at weekly interval from the start of its incidence. The incidence of disease (percentage) was higher under conventional planting (58.6 %) followed by SRI (52.3 %) than furrow planting (49.9 %). The disease incidence was 5 per cent higher in high plant population (625 plants m-2) as compared to lower plant population (300 plants m-2) mainly due 4.1 per cent higher relative humidity within canopy. The correlation analysis revealed that minimum temperature and evening relative humidity significantly affected the disease incidence. The regression model developed with 2012 and 2013 data had highly significant R2 values which was validated with 2014 data.
Highlights
Rice production is influenced by weather variables which play important role in the appearance, multiplication and spread of the pests and diseases
The results of experiments indicated that the brown leaf spot incidence was 4 per cent higher under 30th June transplanted crop as compared to 15th June transplanted crop because of favourable microclimatic conditions
During second date of sowing the canopy temperature was lower whereas relative humidity within canopy was higher as compared to first date of sowing
Summary
Rice production is influenced by weather variables which play important role in the appearance, multiplication and spread of the pests and diseases. Et al (2004) correlated different pests of rice in Kerala with weather parameters and developed forewarning models. Sheath blight disease in rice was correlated with weather parameters byRini Pal et al (2017), while Yella Reddy et al (2006) developed dynamic weather based indices for forewarning rice blast in A.P. and H.P. The brown leaf spot is a chronic disease of rice crop which causes yield losses in relative terms from 4 to 52 per cent. The knowledge on interaction of weather, planting methods, plant population and diseases can be helpful in management of brown leaf spot of rice. Keeping this in view, the experiments were conducted to study the effect of different planting methods and meteorological parameters on incidence of brown leaf spot of rice
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