The toxicity of leaf and bark of Thevetia peruviana plant to fingerlings of Labeo rohita (Hamilton) in different conditions

The piscicidal activity of different organic solvent (i.e. acetone, diethyl ether, ethyl alcohol, chloroform and carbon tetrachloride) extracts from leaf and bark of Thevetia peruviana(Pers.) L. Schum. plant which is belong to Family: Apocynaceae against fingerlings of Labeo rohita(Hamilton) in laboratory and pond conditions was investigated. The LC50values of acetone leaf extracts of Thevetia peruvianaplant is 70.62 mg/L (24h) in laboratory condition and 380.49 mg/L (24h) in pond condition and bark extracts of Thevetia peruvianaplant is 82.19 mg/L (24h) in laboratory condition and 424.09 mg/L (24h) in pond condition against fingerlings of Labeo rohita. Similar trend of toxicity was also observed in case of other solvents i.e. diethyl ether, ethyl alcohol, chloroform and carbon tetrachloride leaf and bark extracts of Thevetia peruvianaplant against the freshwater non-target fingerlings of Labeo rohitain laboratory and pond conditions. The toxicological actions of Thevetia peruviana plant may be due to the presence of apigenin-5-methyl ether (flavonoid) and triterpenoid glycosides. Although, at present very little literature is available on the control of fishes through plant origin pesticides, an attempt has been made in this paper to assemble all the known information on piscicidal properties of common medicinal plants of eastern Uttar Pradesh, India which might be useful for the control of harmful snails, mosquitoes and fishes