Seasonal dynamics of whitefly, Bemisia tabaci (Gennadius) on transgenic Bt cotton and their correlation with abiotic factors
Rajesh Soni, N.K. Dhakad
The first incidence of whitefly noted during mid-July when cotton crop was on two to four true leaf stage and remained active throughout crop season. The whitefly population increased from July to September and noted peak during October month (16.78/3leaves at 43 MSW in 2011 and 16.32/3leaves at 40 MSW in 2012) when crop was in boll development stage and recorded minimum during December month when crop was in maturity phase. Maximum temperature (r=0.550) exhibited highly significant positive correlation during 2011 and non-significant positive correlation (r= 0.314) during 2012. Significant negative correlation found with rainfall (r= - 0.575) during first year but non-significant negative correlation (r= -0.330) reported during second year with whitefly population. Wind velocity remain non-significant negative correlation (r= - 0.269 and r= -0.269) during both years.