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Disease Note. Some Previously Unreported Hosts of Armillaria Root Rot. C. C. Thanassoulopoulos, Aristotelian University of Thessaloniki, Faculty of Agriculture, Plant Pathology Laboratory, 540 06 Thessaloniki, Greece. M. C. Artopeadis, Aristotelian University of Thessaloniki, Faculty of Agriculture, Plant Pathology Laboratory, 540 06 Thessaloniki, Greece. Plant Dis. 75:101. Accepted for publication 24 July 1990. Copyright 1991 The American Phytopathological Society. DOI: 10.1094/PD-75-0101B. Armillaria mellea (Vahl.:Fr.) P. Kumm. sensu stricto was found on dying Salvia officinalis L., S. triloba L., Origanum heracleoticum L., Hyssopus officinalis L., Sideritis roeseri Boiss & Heldr., and Lavandula stoechas L. in a cultivated collection of 150 species of aromatic and medicinal plants in Thessaloniki County in Greece. Identification of the fungus was based on the morphological characters, the growth rate on 3% malt agar and 0.05% tannic acid, and the Korhonen's test of compatibility (1,2). An isolate of the fungus from S. tri/oba was grown on 6-8 X 0.08-1 cm pieces of pear stems placed in melted potato-dextrose agar and sterilized. After colonization, the pear pieces were removed, and agar was scraped from them and placed between the roots of the plants in pots. Ten plants of each species were inoculated, and 10 uninoculated plants of each served as controls. The soil in the pots had been fumigated with methyl bromide. Within 15 mo, all inoculated plants of the six species were infected; eight plants of Lavandula, five of Sideritis, five of Hyssopus, and six of Origanum died. The rest of the plants had extensive root rot, with rhizomorphs attached on rotten areas. Control plants remained healthy. This appears to be the first report of Armillaria on these hosts. |