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Assessment of fungal isolates for development of a myco-acaricide for cattle tick control
- Source :
- Vector borne and zoonotic diseases (Larchmont, N.Y.). 5(3)
- Publication Year :
- 2005
-
Abstract
- Entomopathogenic fungal isolates of Arachnid origin were assessed for their ability to produce mortality and inhibit egg hatching in Boophilus microplus with the aim of selecting an isolate for development into a myco-acaricide for control of cattle ticks. The ability of the most promising isolate to target developmental stages of more than one tick species and the optimum concentration of fungal inoculum to be used for future studies were determined. Metarhizium anisopliae was the most pathogenic of the three fungal species tested on B. microplus, producing shorter average survival times (ASTs) for engorged adults (AST = 5.2 +/- 0.1 days) and larvae (AST = 9.3 +/- 0.4 days), and a longer average hatching times (AHT; AHT = 19.8 +/- 0.5 days) in comparison to Simplicillium lamellicola and Paecilomyces farinosus. In comparative studies on two tick species with similar life cycles, M. anisopliae produced a shorter AST in engorged adult B. microplus (AST = 8.8 +/- 0.3 days) than Rhipicephalus sanguineus (AST = 10.3 +/- 0.3 days). M. anisopliae was pathogenic to larvae of B. microplus (AST = 7.7 +/- 0.4 days), however, had no effect on larvae of R. sanguineus (AST = 14.6 +/- 0.3 days) as the AST of this treatment was similar to its untreated control (AST = 14.1 +/- 0.4 days). M. anisopliae lengthened the AHTs in both B. microplus (AHT = 16.4 +/- 0.3 days) and R. sanguineus (AHT = 16.7 +/- 0.3 days) in comparison to the controls. The ASTs of engorged adult B. microplus treated with M. anisopliae shortened as the concentration was increased from 1 x 10(7) to 5 x 10(8) conidia/ mL. A further increase in concentration, 1 x 10(9) conidia/mL (AST = 10.2 +/- 0.4 days) did not shorten or lengthen the AST in comparison to 5 x 10(8) conidia/mL (AST = 9.4 +/- 0.3 days).
- Subjects :
- animal structures
Time Factors
Ixodidae
Rhipicephalus sanguineus
Zoology
Metarhizium anisopliae
Cattle Diseases
Biology
Microbiology
Virology
parasitic diseases
Animals
Tick Control
Natural enemies
Pest Control, Biological
Parasite Egg Count
Life Cycle Stages
Hatching
Acaricide
fungi
biology.organism_classification
Simplicillium lamellicola
Tick Infestations
Infectious Diseases
Larva
embryonic structures
Arachnid Vectors
Cattle
Female
Mitosporic Fungi
Subjects
Details
- ISSN :
- 15303667
- Volume :
- 5
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Vector borne and zoonotic diseases (Larchmont, N.Y.)
- Accession number :
- edsair.doi.dedup.....7c2fb7ce7f83b090bf8370ff054ff5f2