Abstract
Undamaged sclerotia of Stromatinia gladioli (Drayt.) Whetz. remained dormant in the absence of host plants. In tests with seedlings and plant tissue extracts, sclerotia germinated only in response to host species. The sclerotial germination stimulant was present in Gladiolus root exudate. Under aseptic conditions sclerotia germinated freely without any specific responses to the plant extracts and nutrient solutions tested. Sclerotia were shown to be subject to soil fungistasis. Host-range tests suggested that S. gladioli is confined as a parasite to the Iridaceae.
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