Bacillus thuringiensisisolates from Egyptian soils and their potential activity against lepidopterous insects

Autor:	M. Ragaie, Mohamed S. Salama, A. A. El-Banna, N.M. Abd El-Ghany, M. Saker, H. S. Salama
Rok vydání:	2012
Předmět:	Veterinary medicine biology Soil test fungi biology.organism_classification Standard Preparations Heliothis Bacillus thuringiensis Soil water Botany Potency Spodoptera littoralis Agronomy and Crop Science Helicoverpa
Zdroj:	Archives Of Phytopathology And Plant Protection. 45:856-868
ISSN:	1477-2906 0323-5408
DOI:	10.1080/03235408.2011.599134
Popis:	This study aims to search for indigenous Bacillus thuringiensis (Bt) strains from the soils of different locations representing 11 Egyptian governorates. A total of 2671 colonies from 93 soil samples were examined. The total number of Bt positive soil samples was 40/93 i.e. 43.01%. The results indicate that the percentage of the occurrence of Bt in these samples was 3.818%. The Egyptian soil showed to be rich in Bt. The evaluation of the potential activity of 40 positive soil isolates against Spodoptera littoralis and Helicoverpa (=Heliothis) armigera was carried out. Subsequently, LC50 and LC90 values and the potency of the Bt isolates were determined when applied against the target insects with reference to three standard preparations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b1ef80af9ac7b41a897e1735e351e8a9 https://doi.org/10.1080/03235408.2011.599134 Zobrazit plný text záznamu