Morphological symptoms and ecological peculiarities of table beet clamp rot | Морфологические признаки и экологические особенности развития возбудителей кагатной гнили столовой свеклы
2012
Sviridov, A.V. | Zenchik, S.S., Grodno State Agrarian Univ. (Belarus)
In the conditions of the Republic of Belarus there was realized a study of species composition, morphological and ecological peculiar features of agents of clamp rot of table beet (Beta vulgaris). The clamp rot agents are represented by such fungi as Phoma betae, Fusarium culmorum, Fusarium eguiseti, Verticillium spp., Alternaria tenuis, Sclerotinia sclerotiorum. The optimum temperature conditions for clamp rot fungi development into pure crop comprise 20 deg C – for S. sclerotiorum, P. betae, F. eguiseti; 22 deg C for F. culmorum, Verticillium spp. and A. tenuis. Relative air humidity has a direct effect on the intensity of clamp rot agents development. Thus A. tenuis and S. sclerotiorum develop faster under the pH=5; P. betae, F. culmorum, F. eguiseti and Verticillium spp. need the pH=6. Clamp rot agents conidia of red beet roots grow rapidly in the drip-liquid moisture conditions and the most favorable conditions for this process are possible at ambient temperature +20 - +25 deg C; to infect red root beet tissues - 18 – 20 deg C.
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