E. Abdalla, Tag Elsir, Ahmed M. Elmustafa, & Hassan A. Mubarak. " Establishment and parasitism efficiency of Trichogramma principium (Sugonyaev et Sorokina) on Helicoverpa armigera (Hb.) infesting cotton in Sudan." Gezira Journal of Agricultural Science [Online], 10.1 (2012): 105-117. Web. 3 Jun. 2026