Selection of entomopathogenic fungi and infeccion of Hirsutella sp. on Brevipalpus phoenicis (Geijskes, 1939). / Seleção de fungos entomopatogênicos e infecção de Hirsutella sp. em Brevipalpus phoenicis (Geijskes, 1939).

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

In this research, the patogenicity of 52 isolates of entomopathogenic fungi against Brevipalpus phoenicis and the production of four isolates of Hirsutella spp. in solid medium (M.C.) were evalueted under laboratory condition. The stages of the biological cycle of Hirsutella sp. (isolated 1269) on adults of B. phoenicis were evalueted with the use of an electron scan microscope, besides the occurrence of horizontal transmission of this fungi from cadavers and from an inoculate substract to new hosts. The isolates of Hirsutella sp. tested were pathogenic to the mite, with high mortality (>90%) after six days of the inoculation. The isolate 1269 showed high levels of vegetative growth and sporulation and was selected as the most promising one. The complete biological cycle of Hirsutella sp. ocurred after 120 hours of the inoculation, from adhesion to extrusion processes. The horizontal transmission of fungi from cadavers and inoculate substract ocurred by causing levels mortality superior to 50% in both cases, showing that the fungi was capable to infect new hosts in these situations. Hirsutella sp. was an efficient pathogen in the control of B. phoenicis and could be exploited in field control strategies through an inoculative introduction, increment or conservation.

ASSUNTO(S)

phytophagous mite citrus vetores de doenças de planta entomopathogenic fungi leprose ácaro de plantas fungos entomopatogênicos vector of plant disease citricultura leprosis

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