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2007, Plant Pathology
2003 •
The sugar beet (Beta vulgaris) is an important plant in agriculture and sugar industry, and it is widely cultivated in European countries. Getting proper raw material of sugar beets (roots) is a problem for agriculture. Some disease symptoms observed on sugar beet roots are atypical tumor-like deformations. The causative agent of these deformations is known in the old literature as Xanthomonas beticola. The disease's name in Poland is ''tuberkuloza'' and in the USA it refers to a description of a pocket disease—therefore we may consider those diseases to be the same. The clear description of X. beticola disease can be found in many phytopathological manuals printed in the past and nowadays. Symptoms of the disease were noted in Poland last year, and the preliminary data of the yield quality show that the quality of diseased roots is worse (less sugar content) than of healthy roots. For the proper disease diagnoses, the literature was searched and this searching lead us to conclusion that there is no simple way to recognize the causal organism in the field conditions, and we suppose that X. beticola does not exist.
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The reactions of Beta procumbens C.Sm. and Beta webbiana Moq. were compared to those of Beta vulgaris L. with regard to an infection by Cercospora beticola Sacc. The fleckreaction observed in B. webbiana may be interpreted as hypersensitvity based on symptomatological, light microscopical, luorescent microscopical and electron microscopical data. The B. procumbens clone was found to show resistance characteristics similar to those of B. webbiana and B. vulgaris, as it reacted both by flecks (B. webbiana) and leaf spots (B. vulgaris) to a C. beticola infection.
Plant Disease
First Report of Leaf Spot of Sugar Beet Caused by Stemphylium vesicarium in Minnesota, USAIn July 2021, sugar beet (Beta vulgaris L.) leaves with numerous tan to brown spots with white-bleached center and oval to irregularly shaped were collected from a field in Minnesota (MN) (46.2774° N, 96.3100° W), with 15% disease incidence and 30% disease severity. Leaves were washed with tap water then surface disinfected in 1% NaOCl aqueous solution for 1 min. Samples were rinsed thrice with sterile distilled water and dried in a laminar flow hood. A 2-cm leaf disc was plated on potato dextrose agar amended with streptomycin sulfate (200 mg/L) and incubated for four days at 25°C under 12-h light/dark cycle. Single spore cultures were obtained by suspending in sterile water spores harvested from a single colony. The suspension was streaked on a dish with V8 agar media and incubated as described. Five pure cultures were transferred to clarified V8 agar media for morphological feature observations. Colonies were uniform in appearance and developed light to olivaceous green mycelium....
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