Host associated variations in neonicotinoid susceptibility in Bemisia tabaci and correlation with CYTP450 Shah Vivek1,*, Srivastava Chitra, Subramanian S., Naveen N.C.2 Division of Entomology, ICAR-Indian Agricultural Research Institute, New Delhi, 110012 1Division of Crop Protection, ICAR-Central Institute for Cotton Research, Nagpur, 440010 2Masaryk University, Brno, Czech Republic *Email: vivek4256@gmail.com (corresponding author)
Abstract Neonicotinoid susceptibility in five populations of Bemisia tabaci (Gennadius) from two major cotton growing regions of India was evaluated. These included-North region: Sriganganagar (Rajasthan), Ludhiana (Punjab) and New Delhi and Central region: Khandwa (Madhya Pradesh) and Amravati (Maharashtra). To establish a correlation between neonicotinoid susceptibility and populations, LC50 (imidacloprid, thiamethoxam and acetamiprid), and activity of cytochrome P450 were explored. Bioassay revealed that population from Amravati recorded the maximum lethal concentration with least susceptibility to neonicotinoids with LC50 values ranging from 1317.21 to 1448.22 mg/l, whereas New Delhi population was the most susceptible (LC50 values ranging from 328.18 to 552.51 mg/l). This was also evident from level of cytochrome P450 levels. The difference in cytochrome P450 monooxygenase activity was observed to be non-significant. New Delhi population was taken as a unity to compare increase in cytochrome P450 activity with increase being in the range of 1.90 to 2.39 for cotton, 2.12 to 3.11 for brinjal and 1.87 to 3.08 for tomato as a hosts. Top Keywords Bemisia tabaci, neonicotinoids, cotton, brinjal, tomato, Sriganganagar, Ludhiana, New Delhi, Khandwa, Amravati, cytochrome P450, susceptibility, . Top |