Cypress Canker Control With Fungicides | Arboriculture & Urban Forestry

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Table 1.
Germination of S. cardinals on fungicide amended PDA.
Percent germination
g/liter^*
Fungicide 1000 500 100 10 0
Tribasic copper sulfate 96 100 100 100 –
Benomyl – 80 100 100 –
Chlorothalonil 0 0 0 0 –
Control (unamended) – – – – 100
↵* Average from 2 plates after 24 hours.
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Table 2.
Growth of S. cardinale on fungicide amended PDA.
Radial Growth (mm) ^*
g/liter
Fungicide 1000 100 10 1 0
Control (unamended) – – – – 51
Tribasic copper sulfate^** 15 43 47 53 –
Chlorothalonil 8 12 13 18 –
Benomyl 0 0 0 0 0
↵* Average of 8 plates after 10 days incubation
↵** Based on 53% Cu; 1000 g/liter Cu, etc.
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Table 3.
Control of cypress canker with fungicides.
Average number of Infections per plant^*
Treatment C. leylandii C. macrocarpa
benomyl 0.75 0.4
chlorothalonil 0.25 2.0
tribasic 9.5 4.2
control 6.3 4.6
LSD 0.05 3.0 1.3
LSD 0.01 4.2 1.8
↵* Average of 5 plants; 10 wounds/plant.

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