期刊
JOURNAL OF APPLIED ENTOMOLOGY
卷 139, 期 1-2, 页码 146-153出版社
WILEY
DOI: 10.1111/jen.12183
关键词
diatomaceous earth; entomopathogenic fungi; humidity; oil; ovicidal activity; triatominae
类别
资金
- National Council of Scientific and Technological Development (CNPq)
Little is known about the ovicidal effects of fungi that attack nymphs and adults of triatomine vectors. A combined formulation of Metarhizium anisopliae IP 46 conidia prepared with diatomaceous earth (DE) and vegetable oil was tested against eggs of Triatoma infestans. Eggs were highly susceptible to fungal infection at relative humidity close to saturation [>98% relative humidity (RH)] but not at 75% RH regardless of the formulation applied. Susceptibility of eggs decreased with longer post-ovipositional embryonation periods before treatments. The eventual eclosion of nymphs was best suppressed by application of conidia prepared with DE + oil and at a >98% RH incubation. Moreover, nymphs were less affected by the fungus when exposed for only a 24-h period after eclosion to a treated surface than individuals that were in constant contact with the conidia. These findings contribute to a better understanding of the potential of M.anisopliae as an agent against all developmental stages of T.infestans.
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