Vol. 7, Special Issue 5 (2018)
Study on population dynamics of early shoot borer in sugarcane ecosystem at Pantnagar
Author(s): Shivashankara, AK Karnatak, ARNS Subbanna and Joni Kumar
Abstract: The studies on diversity of insect fauna and the population dynamics of early shoot borer in sugarcane ecosystem were carried out for two seasons during 2014-15 and 2015-16 at Norman E. Borlaug Crop Research Centre of G.B.P.U.A & T. Pantnagar, Uttarakhand, India. Early shoot borer or shoot borer, Chilo infuscutellus (Pyralidae: Lepidoptera) is spread extensively in all sugarcane growing areas of the country including Uttarakhand. The incidence of the Shoot borer was observed from 14th standard meteorological week (SMW) to 26th standard meteorological week, during both the crop seasons of 2014-15 and 2015-16. The population reached its maximum in the month of May; however the peak activity recorded in the 21st and 22nd SMW during both the first and second seasons, respectively. The Pearson correlation coefficient obtained between the weather parameters and early shoot borer population during season 2014-15 revealed that, there was positive non-significant correlation with Tmax and Tmin; negative and highly significant with RHmax, and negative significant with RHmin; while, it was non-significantly correlated with rainfall, respectively. Whereas, during the season 2015-16 there was positive and highly significant correlation with Tmax; positive and non-significant correlation with Tmin; negative significant with RHmax; negative and highly significant with RHmin, and it was negative significantly correlated with rainfall, respectively. Thus the study exhibited that the peak activity of early shoot borer was from 15th to 24th and 15th to 23rd SMW during 2014-15 and 2015-16 crop seasons, respectively.