Abstract

Influence of weather variables on progression of white rust disease of Indian mustard

Highlights

  • The per cent disease index (PDI) was calculated by using following formula: Sum of all the numerical ratings

  • The influence of weather parameters on white rust development was analyzed on marked plants

  • It was apparent that the first appearance of white rust varied among the different dates of sowing and which was governed by suitable weather conditions

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Summary

Short Communication

Influence of weather variables on progression of white rust disease of Indian mustard. Weather is an important factor in the severityof white rust of Indian mustard, which governs the variability in onset and epidemic of the disease. Epidemiology of white rust in Indian mustard in relation to weather parameter in Uttar Pradesh and Rajasthan (Chattopadhyay et al, 2011) was reported in literature and the results showed that late sown crop suffered with more disease. The observation on disease severity was made on twenty leaves showing initial symptoms in each variety and replication in different dates of sowing. The leaves showing the initial symptoms were tagged and observations on disease severity were recorded starting from the appearance of symptoms at an interval of three days. The per cent disease index (PDI) was calculated by using following formula: Sum of all the numerical ratings

Number of leaves examined x maximum disease grade
Onset of white rust disease
Findings
Evaporation Rainfall

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