eng Science and Education Publishing Journal of Environment Pollution and Human Health 2334-3494 2018-04-26 6 2 68 76 10.12691/jephh-6-2-4 JEPHH2018624 article Bulbuli Khanikor khanikorbulbuli@yahoo.co.in 1 Jyotisika Barman 1 Riju Sarma 1 Sudarshana Mahanta 1 Kamal Adhikari 1 Department of Zoology, Gauhati University, Gauhati University, Guwahati efficacy of essential oils from three locally available plants of Assam, India namely Citrus grandis, Citrus paradisi and Cassia fistula were evaluated against the worker group of termite Odontotermes feae Wasmann. Different doses of essential oil were applied by using contact residual toxicity method and LC50 values were recorded after 2h, 4h, and 6h of post treatment. The result revealed highest toxicity of C. grandis with LC50 value 272.36 ppm at 6 h followed by C. paradisi and Cassia fistula with LC50 value 1313.57 ppm and 5537.06 ppm respectively. In all the essential oil treated group of termite the glutathione-S-transferase enzyme activity was found to decrease. Total carbohydrate and protein content was found to significantly decrease in response to LC50 dose of C. grandis and C. paradisi. From the present finding, it can be inferred that the plant essential oil considered for present investigation possess termiticidal properties. http://pubs.sciepub.com/jephh/6/2/4/jephh-6-2-4.pdf Citrus grandis Citrus paradisi Cassia fistula Odontotermes; essential oil GST