Abstract

SANCHEZ-YANEZ, Juan Manuel; VANESSA RUBY, García-Ortiz; ULIBARRI, Gérard  and  HERNANDEZ-ESCARENO, Jesús Jaime. Presence survival spores of Bacillus thuringiensis varieties in grain warehouse. J. Selva Andina Res. Soc. [online]. 2016, vol.7, n.2, pp.34-46. ISSN 2072-9294.

Genus Bacillus thuringiensis (Bt) synthesized spores and crystals toxic to pest-insects in agriculture. Bt is comospolitan then possible to isolate some subspecies or varieties from warehouse. The aims of study were: i) to isolate  Bt varieties from grain at werehouse ii) to evaluate Bt toxicity  on Spodoptera frugiperda and Shitophilus zeamaisese iii) to analyze Bt spores persistence in Zea mays grains at werehouse compared to same Bt on grains exposed to sun radiation. Results showed that at werehouse were recovered more than one variety of Bt spores. According to each isolate Bt1 o Bt2 were toxic to S. frugiperda or S. zeamaisese. One those Bt belong to var morrisoni. At werehouse these spores on Z. mays grains surviving more time, while   the same spores exposed to boicide sun radiation they died.

Keywords : Spores; subspecies; survival; biocide sun radiation.

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