External links Pestalotia rhododendri

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important diseases: pestalotiopsis tip blight of conifers, gray leaf spot


pestalotia secondary pathogen. saprophytic on dead , dying tissues , weakly parasitic infecting wounds under moist conditions.






tips of conifer branches particularly leyland cypress, arborvitae , juniper turn brown grayish in color. infected bark may covered in fungal fruiting structures giving tissue black sooty appearance. leaf spots tend tan gray , result of previous damage such freeze injury, scorching or mechanical wounds.




dark, disc or cushion-shaped acervuli formed under plant epidermis splits open revealing fruiting structures. conidia produced on short simple conidiophores within acervulus.




conidia multi-celled 3 darkly pigmented center cells , clear pointed end cells. conidia ellipsoid or fusoid (football-shaped). diagnostic feature 2 or more clear, whisker-like appendages arising end cell







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