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Pathogenicity of Metarhizium anisopliae (Deuteromycetes) and permethrin to Ixodes scapularis (Acari: Ixodidae) nymphs

Experimental and Applied Acarology

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DOI: 10.1007/s10493-004-5437-z

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Abstract

Effectiveness of the entomopathogenic fungus Metarhizium anisopliae, for controlling nymphal Ixodes scapularis, was tested in laboratory and field trials. In the laboratory, M. anisopliae (Metschnikoff) Sorokin strain ESC1 was moderately pathogenic, with an LC50 of 107 spores/ml and induced 70% mortality at 109 spores/ml. In a field study, however, 109 spores/ml M. anisopliae did not effectively control questing I. scapularis nymphs, and significant differences were not detected in pre- and post-treatment densities. For nymphs collected and returned to the laboratory for observation, mortality was low in treatment groups, ranging from 20 to 36%. To assess whether a chemical acaricide would synergistically enhance pathogenicity of the fungus, we challenged unfed nymphal I. scapularis with combinations of M. anisopliae and permethrin, a relatively safe pyrethroid acaricide, in two separate bioassays. Significant interactions between M. anisopliae and permethrin were not observed, supporting neither synergism nor antagonism.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Pathogenicity of Metarhizium anisopliae (Deuteromycetes) and permethrin to Ixodes scapularis (Acari: Ixodidae) nymphs
Series title:
Experimental and Applied Acarology
DOI:
10.1007/s10493-004-5437-z
Volume
35
Issue:
4
Year Published:
2005
Language:
English
Contributing office(s):
Patuxent Wildlife Research Center
Description:
301-316
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Experimental and Applied Acarology
First page:
301
Last page:
316
Number of Pages:
16