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)