Vol. 11, Issue 8 (2022)

Author(s):
T Navin Kumar, M Kannan, A Lakshmanan and B Vinothkumar

Abstract:
The rugose spiralling whitefly, Aleurodicus rugioperculatus Martin (Hemiptera: Aleyrodidae) (RSW) is an invasive insect pest in coconut crop. It caused more economic losses and limited insecticides are available for the management and indiscriminate use of chemical insecticides caused health hazards to human being. It is necessary to evaluate eco-friendly biopesticides are the need of the hour. The present study carried out to assess the efficacy of neem based biopesticide, namely Neemazal- T/S (10000 ppm) against the invasive pests Rugose spiralling whitefly (Aleurodicus rugioperculatus) (RSW) under laboratory condition at Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, India. The insect bioassays were conducted to evaluate the insecticidal efficacy of Neemazal - T/S (10000 ppm) against RSW and the results of the bioassays revealed that the LC₅₀ values as 6.799, 15.878 and 25.408 ppm for the early, late and mixed life stages of RSW, respectively. Similarly, the LC₉₀ values as 51.80, 132.10 and 167.10 ppm for the early, late and mixed life stages of RSW the LC₅₀ values as 6.799, 15.878 and 25.408 ppm for the early, late and mixed life stages of RSW. In both the cases, calculated χ² value was less than the tabular value indicating the goodness of fit. Cent percent mortality were brought by 35 ppm, 75 ppm and 90 ppm concentration on the third day against the early, late and mixed population of RSW.