The effectiveness of 7 fungicides ( Amistar 250 SC, Bayleton 5 WP, Bumper 250 EC, Discus 500 WG, Folicur BT 225 EC, Folicur Multi 50 WG, Score 250 EC) and 2 bioproducts (Biochikol 020 PC and Biosept 33 SL) in the control of Puccinia pelargonii-zonalis was tested on pelargonium cv. Pulsar F1 Salmon. Additionally, their influence on plant growth, size of pustules, percentage of germinated spores and phytotoxicity were assessed. Plants were sprayed 4 times at weekly intervals. Among tested compounds the most effective in suppressing new uredia formation were Amistar 250 SC, Bayleton 5 WP, Biosept 33 SL, Bumper 250 EC, Folicur BT 225 EC and Score 250 EC. Furthermore, some fungicides inhibited germination of urediospores on PDA medium. Fourteen days after the last spraying more than 76% of germinating urediospores were found on control leaves. At the same time spores collected from plants protected with Amistar 250 SC, Bayleton 5 WP, Folicur BT 225 EC and Folicur Multi 50 WG germinated sporadically in 1.5 to 4.0%. In the next part of experiment, plants with visible sporulation of P. pelargonii-zonalis were sprayed with tested compounds. After 1, 7 and 14 days of incubation, total number of spores and number of germinating spores were counted. After 1 or 7 days, urediospores collected from untreated plants germinated in more than 80% whereas from plants sprayed with tested fungicides except Amistar 250 SC in 20–66.6%. Amistar 250 SC was the most effective in suppressing urediospore germination. All fungicides used in protection of young pelargonium plants, except Amistar 250 SC and Biochikol 020 PC, decreased plant growth. None of tested compounds showed phytotoxicity toward tested pelargonium cultivar.

The effectiveness of 1 O azole fungicides (Bayfidan 250 EC, Bumper 250 EC, Domark 100 EC, Magnate 50 EC, Mirage 450 EC, Opus 125 SC, Saprol 190 EC, Score 250 EC, Spartak 450 EC and Systhane 125 EC) in the control of Puccinia horiana was tested on chrysanthemum cv. Fiji Yellow. Additionally, their influence on plant growth, size of pustules and eventual phytotoxicity was assessed. Plants were sprayed 4 times at weekly intervals. On shrubs treated with Bayfidan 250 EC, Domark 100 EC, Magnate 50 EC, Mirage 450 EC, Opus 125 SC, Saprol 190 EC, Score 250 EC, and Systhane 125 EC only sporadic disease symptoms were observed. Mirage 450 EC and Spartak 450 EC were slightly less effective than the other tested fungicides. When most of the tested fungicides were applied curatively, except Mirage 450 EC and Spartak 450 EC, only sporadic pustules on leaves were noticed and over than 95% of pustules were destroyed.

The effectiveness of 25 fungicides in the control of Sphaerotheca pannosa var. rosae were tested on 10 cultivars of roses. Also their influence on plant growth and eventual phytotoxiciry were assessed. The treatments were performed 4 times at weekly intervals. Shrubs treated with Folicur BT 225 EC, Spartak Alpha 380 EC, Sys thane MZ 61 WP, Systhane 125 EC, Tango 500 SC and To pas MZ 61 WP did not show disease symptoms. Bravo 500 SC, Folpan 80 WG, Funaben 50 WP, Penncozeb 80 WG and Saprol 190 EC were slightly less effective than the other tested fungicides. The influence of chemicals on plant growth was closely correlated with cultivar - showing stimulatory. inhibitory or neutral effects. Out of tested preparations Afugan 30 EC, Opus 125 SC and Tango 500 SC were strongly phytotoxic at used doses toward all rose cultivars. The intensity of damage depended on cultivar.

Influence of triforine (standard), garlic juice, Antifung 20 SL (20% vermicompost), Atpolan 80 EC (76% mineral oil), Biosept (grapefruit juice) and Atonik AL on development of Sphaerotheca pannosa var. rosae was evaluated. Garlic juice, Atpolan 80 EC and Biosept applied as rose spray gave similar effect in the control S. pannosa var. rosae as triforine. Observations under scanning electron microscop indicated that 24 hrs after rose spraying all tested compounds cause almost complete collapse of conidia and hyphe.

Efficacy of azoxystrobin, dichlofluanid, imazalil, kresoxim-methyl, propiconazole and triforine (standard) in the control ofDiplocarpon rosae was evaluated in the years 1997-1999. The compounds were applied as a plant spray. First treatment of plants was performed when first disease symptoms occurred on leaves and spraying was repeated 9 times at weekly intervals. In the autumn of 1999 plants not previously treated with fungicides and showing visible disease symptoms were spraye and after one, 7 and 14 days diseased leaves were sampled. Spores from leaves were transferred onto Petri dishes with potato-dextrose agar. Number of germinating spores was counted after 24 h incubation (4 Petri dishes for each compounds). After 9-weeks protection of rose shrubs with the tested compounds the spread of mycelium on new leaves was strongly inhibited. Only bupirimate at concentration 0,05% gave very poor control of D. rosae. All other tested compounds were better or as good as triforine. Reduction of concentrations used resulted in lower effectiveness. After I, 7 or 14 days from the last spraying of plants with dichlofluanid, kresoxim-methyl and triforine germination of fungus spores was below 9% except kresoxim-methyl at concentration O.Ol% after 14 days (12.5%).