2012. On - Farm Evaluation of Natural Toxicants from Tephrosia Vogelii and Petiveria Alliacea on Megalurothrips Sjostedti and Apion Varium of Cowpea (Vigna Unguiculata (L) Walp). Bangladesh Journal of Agricultural Research. 36, 4 (Sep. 2012), 575–582. DOI:https://doi.org/10.3329/bjar.v36i4.11745.