Significant Relationship as Correlation
Long term relationship studied was performed in between weather parameter and karnal bund disease for the respective stations. Data pertaining to average infection (%) of karnal bunt disease of wheat and meteorological parameters of 6th to 12th SMW (5th February to 25th March) from 1981-82 to 2012-13 of Karnal station were analyzed for most sensitive crop growth stage corresponding to ear emergence and subsequent crop growth stages. The coefficient of correlation obtained between various meteorological parameters and average karnal bunt infection (%). Rainfall and number of rainy days along with minimum temperature during the 6th SMW to 12th SMWs were the most important weather parameters indicating favorable role in the development of the Karnal bunt disease. Wind speed was also important during this week for the transfer of primary spordia from soil to leaf. Rainfall along with morning and evening relative humidity during 9th SMW indicated favorable role in further multiplication of secondary spordia. Rainfall and rainy days during 10th, 11th and 12th meteorological weeks helped in multiplication of karnal bunt disease in wheat. Rainfall along rainy days and maximum temperature and relative humidity 11th meteorological weeks helped in multiplication of karnal bunt disease in wheat.
Table 3: Long period average prevailed weather conditions funder development and progression of karnal bunt disease percentage (6th to 12th SMWs)