author(s)
M Santhosh Kumar, Dk Rana, B Jhansi Rani and Sandip Agale

abstract
Methanol, ethyl acetate, hexane, chloroform, acetone extracts of four Ocimum L. sppviz. Ocimumsanctum, O.basilicum, O.americanum, O.gratissimum were tested for insecticidal activities against the 3^rdinstar nymphs of brown planthopper Nilaparvatalugens, (Stal.) by using 40 days old TN1 rice stems treated by following dipping method with respective Ocimum plant extracts in laboratory conditions at Indian Institute of Rice Research, IIRR, Hyderabad, Telangana during 2016-2017.The mortality percent of BPH nymphs at a dose of 1.0% concentration of different Ocimum L. spp extracts showed significant insecticidal activity. The mortality percentage was evaluated with different Ocimum spp of five solvent extracts were viz. in methanol extracts of O.gratissimum showed significant insecticidal activity 73.92% followed by O.sanctum 63.91%, O.basilicum 53.57%, O.americanum 51.52% compared to control 15.57%.In ethyl acetate extracts O.gratissimum65.88%, O.basilicum 62.32%, O.sanctum 53.48%, O.americanum 53.28% and 10.76% in control. In hexane extracts O.gratissimum 57.00%, O.basilicum 50.64%, O.sanctum 46.80%, O.americanum 42.16% and 14.12% incontrol. Inchloroform extracts O.gratissimum 57.24%, O.americanum 46.20%, O.basilicum 41.72%, O.sanctum31.32% and 11.24% in control. In acetone extracts O.gratissimum 58.96%, O.sanctum45.40%, O.americanum 45.36%, O.basilicum 44.84% and in control 16.92 percent.