01545naa a2200181 a 450000100080000000500110000800800410001902200140006010000180007424501260009226000090021852010260022765000150125365000120126865300150128070000180129577300500131316321162023-05-31       1991    bl uuuu     u00u1 u    #d  a0191-29171 aGRAHAM, J. H.  aPeat-based media as a source of Thielaviopsis basicola causing black root rot on citrus seedlings.h[electronic resource]  c1991  aThielaviopsis basicola was identified as the cause of back root rot on citrus seedlings growing in soilless peat-based media in Florida greenhouse nurseries. Three of 14 samples of commercial bases of media and two of 12 samples of Canadian sphagnum peat yielded low densities of T. basicola (1-2 cfu/cm3 of medium) when wetted and plated on selective carrot-etridiazolnystatin medium. T.basicola survived in peat debris and was detected from air samples in a greenhouse that had contained infected plants 2 mo previously. Under winter conditions, where media temperatures ranged from 18 to 27 C, isolates of T. basicola from peat and a peat-based root rot on Ridge Pineapple sweet orange, sour orange, and Volkamer lemon; and mild root rot on rough lemon, trifoliate orange, Carrizo citrange, and Swingle citrumelo. Propagule density in the rhizosphere of all cultivars increased from the inoculated levels in the peat-based medium. Peat-based media may act as a source of T. basicola, a pathogen with a wide host range.  aCalifornia  aDoença  acultivares1 aTIMMER, N. H.  tPlant Diseasegv.75, n.12, p.1246-1249, 1991.