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Stem and leaf rot incited by Sclerotium rolfsii was found on Epipremnum aureum, Hedera helix, and Peperomia obtusifolia rooting cuttings. S. rolfsii was isolated from about 90% of the analysed plant materials. Isolate from E. aureum colonized all the parts of the 3 host plants as well as eustoma and lavender. Necrosis spread significantly faster on peperomia and the nonhost plants. The fungus produced...
The plant pathogen, Phytophthora cryptogea, was recovered from 4/5 of the 75 poinsettias collected from two greenhouse farms. The poinsettias showed stunting and wilting as well as stem base and root rot symptoms. Representative isolates of the species from two poinsettia cultivars, colonized stem parts, leaf petioles, leaf blades and root parts. Stem parts of 6 cultivars were colonized at a slower...
Severe root and stem base rot was noticed for the first time on Sciadopitys verticillata in 3 hardy ornamental nursery stocks. Phytophthora citrophthora was isolated from about 4/5 of the analysed plants. In the laboratory trials this species caused stem and root rot. On stem parts and needles inoculated by isolates from the host plant and Pinus sylvestris, necrosis was observed to have spread at...
In 2009-2010, Phytophthora citrophthora and P. cryptogea were consistently isolated from the diseased shoot parts of periwinkle (Vinca minor L.). The periwinkle had been collected from hardy ornamental nursery stock. The species were identified on the basis of colony patterns and their morphology as well as with molecular methods. Symptoms including yellowing and browning of leaves, dark brown or...
Phytophthora inflata Caros & Tucker was detected together with P. citricola Sawada from rhododendron cv. University of Helsinki with necrotic spots on leaves. Spots were enlarged on tip parts of the stems. The rhododendron plantswere taken from hardy ornamental stock. Inoculation of the leaf blades of 15 species and cultivars of rhododendron with P. inflata and P. citricola resulted in the development...
Phytophthora citrophthora was isolated from grafted lilac (Syringa vulgaris). Showing browning of leaf blade edge and necrosis spreading on all leaves. On the stem bases, beginning from the grafted place, necrosis had even spread 20 cm upward, whereas root stock shoots and roots were healthy. Using rhododendron leaves as the bait, Phytophthora citrophthora was isolated from soil where growing plants...
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