Abstract
Conidia of Verticillium lecanii , coated with mucilage, adhered to all surfaces of the western flower thrips ( Frankliniella occidentalis ). Mucilage continued to be secreted during germination and was particularly evident around the hyphal tips and at penetration sites. Both conidia and hyphae produced narrow pegs which penetrated the cuticle and the cuticle in juxtaposition with growing hyphae was dissolved. Verticillium lecanii typically colonized the surface of the insect prior to, or concomitant with, penetration of the host cuticle. Infected insects died before the pathogen had substantially colonized the haemocoel but once in the haemocoel, hyphal bodies rapidly multiplied and invaded virtually all tissues and organs. The hyphae eventually emerged from the diseased insect and differentiated into conidiophores which produced conidia coated in mucus.
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