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In 1998 and 1999 flurprimidol spray applications to seed-propagated geranium (Pelargonium x hortorum L.H.Bailey) cultivars were made to evaluate efficacy and identify optimum concentration of flurprimidol. Growth retardant was applied as a single spray at 0, 7.5, 15 and 22.5 mg L-1, when plants were 9-13 cm in height. The response of plants to furprimidol application varied depending on geranium cultivar. At the time of flowering the plants sprayed with flurprimidol at concentrations of 7.5, 15 and 22.5 mg L 1 were significantly shorter than the untreated ones. The plant diameter, floret diameter, floret peduncle length and inflorescence diameter of geranium treated with flurprimidol were significantly smaller than those of the control plants. Flurprimidol hastened flowering of geranium cultivars 'Suzan Improved', 'Pinto Salmon' and 'Ringo 2000 Violeť by 5-8 days in 1999 but had no significant effect on days to flowering in 1998. The chemical name used: a-(l -methylethyl)-a-[4-(tritluoromethyloxy)-phenyl]-5-pyrimidine-methanol (flurprimidol).
From the rhizosphere of investigated pot plants six Verticillium species (V. alboatrum, V. dahliae, V. nigrescens, V. nubilum, V. album and V. fusisporum), potentially dangerous to plants, were isolated. Most often colonized rhizospheres of diseased pot plants by Verticillium album were those of Peperomia obtusifolia and Calathea picturata (relative density 8%). Relative density of Verticillim group in other sick plants rhizosphere was up to 4% whereas that of the healthy looking plants varied from 1 to 3%. Pot plants are very sensitive to factors unfavourable to their growth.
Two experiments were conducted, in which the granulated rockwool 'Grodan', utilised rockwool 'Flomiin' used before as slabs and remained after 2-year carnation culture (UR) - shredded and steamed and two kinds of insulation rockwool of domestic production: from Gliwice (RG) and from Nidzica (RN) were used as a substrate or its ingredient for mentioned in title plants. Particular plant species expressed somewhat diversified reaction, but generally rockwool showed full usability as a substrate or its component. The best kind appeared to be UR. RG was good in the mix, where it was in 25% of the volume, but RN was unsuitable.
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