ETIOLOGY AND SYMPTOMS OF PURPLE SPOTS ON THE ALTAI ONION
Abstract
The paper reveals the first data on purple spots on the Altai onion and declares it is caused by complex plant pathogenic fungi Dematiaceae. Frequency of mycromycete Alternaria, Stemphylium and Heterosporium was 39,0; 87,1 and 100,0 % correspondently. Stemphylium fungi are characterized by high competitiveness as they made strong mycelium and great number of conidium. The author outlines new symptoms of the disease. The spots were concentrated in some zones or there wasn’t any symptom of this kind. Frequency of these parameters was 64,3 and 35,6 % correspondently. There were purple and violet shades in spots regardless Alternaria fungi in pathogenic complex. The experiment found out 3 main shapes of spots on the leaves where oval shape and shape of wide spindle prevailed in 82.4 %. The experiment reveals 5 shapes of spots on flower spike where the oval shape, round and a shape of wide spindle prevailed in 80 %. The onion was damaged with tiny spots (0,3–1,0), middle spots (1,1–3,0) and big spots (3,1–6,2 cm) where tiny spots and middle ones prevailed in 35,6 and 59,4 % corresondently. The researchers observed single spots more often (1–3 spots on damaged organ); the other spots (23,6 %) were observed in groups and chains as confluent. The spots on the leaves were observed mainly in the front part and leaf base (84,4 % in total) and on flower spikes spots damaged the upper part and middle part (81,8 %). The number of spots on the leaves didn’t exceed 6 and on the flower spikes reached 7–16. The publication outlines necrotic zone around spots where the width varies from 5 to 50 mm.
About the Author
S. M. Nikitina
Новосибирский государственный аграрный университет
Russian Federation
Russian Federation
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Review
For citations:
Nikitina S.M. ETIOLOGY AND SYMPTOMS OF PURPLE SPOTS ON THE ALTAI ONION. Bulletin of NSAU (Novosibirsk State Agrarian University). 2015;(2):44-49. (In Russ.)
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