Glasilo biljne zaštite, Vol. 13 No. 5, 2013.
Professional paper
Ray speck (Stemphylium sp.) a new disease of chrysanthemum flower petals in Croatia
Milorad Šubić
; Poljoprivredna savjetodavna služba Podružnica Međimurske županije, Čakovec
Nikola Blažon
; Agromeđimurje d.d., Čakovec
Abstract
A new disease of chrysanthemum causing ray speck was found in north part of Medjimurje region (Miklavec city near river Mum) (46°48'19"N; 16°50'43"E). In the beginning of last week in October 2012, when chrysanthemums cv. "white ball" (May Shoesmith) harvested for flower arrangements, small reddish-brown lesions (0.1 mm) were observed on the ray florets. Disease was more visible on plants in storage and less in plastic greenhouse. Meteorological data on this locality were very favorable for disease epidemiology, because of rain (83,8 mm per month), fog and dew (9.380 minute free moisture per month in leaf wetness sensor), high relative humidity (average month value 90,6 %), and optimal temperature (data from "iMetos") (46°45'60"N; 16°56'82"E). The causal fungus was identified as Stemphylium sp. based on typical symptom (the necrotic specks do not enlarge after incubation), and microscopy examination. For chemical control very effective was fungicide Switch WG (fludioxonil & cyprodinil), applied after first visible damage. This is the first report of chrysanthemum ray speck caused by Stemphylium sp. in Croatia.
Keywords
chrysanthemum; new disease; ray speck; Stemphylium sp
Hrčak ID:
169031
URI
Publication date:
1.9.2013.
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