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Fungicidal Control of Lophodermium seditiosum on Pinus sylvestris Seedlings in Swedish Forest Nurseries

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During the 1990s, there were serious outbreaks of the pathogen Lophodermium seditiosum on pine seedlings in Swedish forest nurseries, even though the seedlings had been treated with the fungicide propiconazole. The present experiment was carried out to evaluate two other fungicides, fluazinam and azoxystrobin, as possible alternatives to propiconazole. In the tests, which were all carried out in the same forest nursery, seedlings were treated with either propiconazole, fluazinam or azoxystrobin, and the proportion of needles with ascocarps of L. seditiosum and the number of ascocarps per needle were recorded over the following 2 yrs. Seedlings treated with azoxystrobin already appeared healthier than control seedlings in September of the first year, and by November all azoxystrobin-treated seedlings had fewer ascocarps per needle compared with control seedlings. In autumn of the second year, there were no ascocarps on seedlings treated with fluazinam or azoxystrobin, whereas seedlings treated with propiconazole had similar numbers of ascocarps to non-treated control seedlings.
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Keywords: AZOXYSTROBIN; DISEASE; FLUAZINAM; FOREST; NEEDLE; NURSERY; PATHOGEN; PROPICONAZOLE

Document Type: Research Article

Affiliations: 1: 1 Department of Forest Mycology and Pathology, Swedish University of Agricultural Sciences, Box 7026, SE-750 07 Uppsala, Sweden 2: Svenska Skogsplantor AB, Box 33, SE-551 12 Jo¨nko¨ping, Sweden

Publication date: 2001-03-01

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