Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Internal calibration of electron micrographs with an Orchid virus.

Abstract

The length of particles of orchid (Odontoglossum) ring spot virus [cf. 30: 610] has been established as 300 mµ [31: 434] and they are shown to be a convenient standard for calibration of electron micrographs. Outside the orchid family 4 Chenopodium spp. were found susceptible to the virus and convenient hosts for it, developing local necrotic lesions 5-8 days after inoculation and facilitating rapid identification. Using this method accurate particle lengths were obtained for potato virus X, watermelon mosaic, and bean yellow mosaic viruses.