author(s)
Nitin H Thodsare, Priyanka Bhatt and RP Srivastava

abstract
Murraya koenigii (curry leaf) and Ocimum tenuiflorum (lemon tulsi) oils at 2.5, 2.0, 1.5, 1.0 and 0.5% showed toxicity to 7days old larvae of Spodoptera litura at 24, 48 and 72 hours after exposure (HAE). M. koenigii oil was more toxic compared to O. tenuiflorum oil with LC₅₀ of 1.78 and 2.40, respectively at 24 HAE and LC₅₀ of 1.26 and 1.38, respectively at 48HAE. A comparison of LT₅₀ values between M. koenigii and O. tenuiflorum oils at 2.5 and 2.0% indicated almost similar response 18.8 and 28.4; and 18.6 and 29.1hours, respectively. It revealed that O. tenuiflorum oil was quicker in action than M. koenigii oil. M. koenigii at 1.5 and 2 and 2.5% was most toxic to tobacco caterpillar.