Víctor Manuel Hernández-Velázquez

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The pathogenicity of four native strains of Bacillus thuringiensis against Rhipicephalus (Boophilus) microplus (Canestrine) (Acari: Ixodidae) was evaluated. A R. microplus strain that is resistant to organophosphates, pyrethroids, and amidines, was used in this study. Adult R. microplus females were bioassayed using the immersion test of Drummond against 60(More)
Bacillus thuringiensis is a gram-positive soil-dwelling bacterium that is commonly used as a biological pesticide. This bacterium may also be used for biological control of helminth parasites in domestic animals. In this study, we evaluated the possible ovicidal and cestocidal effects of a total protein extract of B. thuringiensis native strains on the(More)
Fifty-four Bacillus-like strains were isolated from dead Varroa destructor collected in 24 colonies of bees from seven apiaries. The total proteins of 22 isolates were evaluated against adult female V. destructor (100 μg/mL), but only nine caused over 80 % mortality. The LC50 of EA26.1, EA3 and EA11.3 isolates were calculated. The most virulent isolate was(More)
Parasitic agents, such as helminths, are the most important biotic factors affecting aquaculture, and the fluke Centrocestus formosanus is considered to be highly pathogenic in various fish species. There have been efforts to control this parasite with chemical helminthicides, but these efforts have had unsuccessful results. We evaluated the anthelmintic(More)
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