Fungal growth development index and ultrastructural study of whiteflies infected by three Isaria fumosorosea Isolates of different pathogenicity
DOI:
https://doi.org/10.33885/sf.2013.3.1115Keywords:
entomopathogenic fungi, Trialeurodes vaporariorum, infection and colonization process, scanning electron microscopy (SEM)Abstract
The infection process whereby Isaria fumosorosea colonizes whitefly (Trialeurodes
vaporariorum) nymphs was investigated using light and scanning electron microscopy. The fungal
growth development index was used to determine pathogenicity of the isolates studied. The
ultrastructural findings allowed us to examine the course of colonization of T. vaporariorum by
this fungus through the formation of cuticular penetration structures. I. fumosorosea produced
structures that resemble appressoria in shape, and isolates cause serious cuticular damage
suggesting of enzymatic action. The results of this study suggest isolate EH-506/3 as suitable for
whitefly biocontrol.
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