Implication of fungicide application regimes and post spray irrigation on late leaf spot and its residual impact on stem rot of groundnut
2018
ARINDAM SARKAR, SUBHENDU JASH* and
A field experiment was conducted during rabi season of 2015-16 and 2016-17 to study the efficacy of different protectant and systemic fungicides in different application regimes on late leaf spot disease of groundnut and to assess the impact of post spray irrigation timing on the severity of late leaf spot and as well as management of stem rot disease through deposition of foliar applied fungicides. Three sprays of chlorothalonil @ 2g/l (1th, 3rd, 5th) alternated with three sprays of pyraclostrobin @ 1g/l at 2nd, 4th and 6th spray (T8) reduced the highest disease severity (40.74%) as compared to seven spraying of chlorothalonil (T2) at 10 days interval (60.00%). The AUDPC values were significantly different among various treatments. Highest yield (28.89 q/ha) was also recorded in T8. The number of late leaf spot lesion decreased with the increase in gap between spraying and irrigation time. Irrigation after 96 h of fungicide spray caused only 2.02 leaf spot lesion per leaflet and highest pod colonization of 43.63% due to stem rot. Negative correlation was found between pod colonization and number of leaf spot lesion.
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