author(s)
Sanjeev Kumar Kataria, Paramjit Singh, Bhawana and Jaswinder Kaur

abstract
The present study was carried out to find the correlation between population dynamics of whitefly and leafhopper with weather variables from June-November 2013 to June-November 2016 and June-November 2015 to June-November 2016, respectively. The main objectives of the study are to observe the population dynamic and correlate the population of whitefly and leafhopper with various climatic factors. The results revealed that peak population of whitefly was recorded in last fortnight of September in 2013(98.60 whitefly adult per 3leaves), 2014(101.00 whitefly adult per 3leaves) and 2016 (38.42 whitefly adult per 3leaves) whereas it shifted towards early season i.e. from July to August during 2015(Range=28.00-123.60 whitefly adults per 3 leaves). Leaf hopper peak infestation was observed in first fortnight of July during 2015(4.20 leafhopper per 3 leaves) and 2016(4.60 leafhopper per 3 leaves). Simple correlations studies revealed that during 2013 and 2014, the whitefly population was negatively correlated with temperature, relative humidity and rainfall. During 2015, population of whitefly showed a significant positive correlation with minimum temperature (r=0.657) and evening humidity (r=0.833) whereas during 2016, it was negatively correlated with rainfall and non-significant positive correlation with all other factors. Leaf hopper has a non-significant positive correlation with all the three weather variables during 2015 whereas negative correlation with temperature during 2016 and positive correlation with all other weather variables.