Naslov
Use of the bacteria Pseudomonas fluorescens in the control of sugar beet root decay agent – Rhizoctonia solani

Autori
Kristek, Andrija ; Kristek, Suzana ; Pospišil, Milan ; Evačić, Martin ; Galović, Stjepan

Izvornik
Cereal Research Communications (0133-3720) 35 (2007), 2 Part 1; 677-680

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
sugar beet ; P. fluorescens ; R. solani ; fungicides ; nitrogen

Sažetak
In Republic of Croatia sugar beet is grown on approximately 30 000 ha, with an average yield of 37 t/ha and sugar content of 14, 4% Reasons for such a low production results after the Patriotic War are found in inadequate soil management, devastated soil structure, and climatic conditions. The result of the stated is high degree of disease development. Apart from beet leaf spot (C. beticola) and the disease induced by Rhyzomanie virus, the most serious issue is root rot of beet induced by pathogenic fungi (P. betae, P. ultimum, P. debarianum, R. solani, Fusarium spp., and A. cochlioides). Depending on the soil and climatic conditions, 10-50% of plants have been decaying being attacked by the pathogenic fungi. Growth of the surviving plants is slowed significantly giving them no possibility to reach normal size, which finally reflects on yield and sugar content values. Major measure in the control of sugar beet root decay agent is application of fungicides in the course of seed processing. However, though chemical fungicides prevent development of the fungi to some degree, they are at a disadvantage affecting human health and environment (being exposed to washing out, they give rise to underground water eutrophication). Moreover, pathogenic fungi have ability to rapidly develop resistance to the fungicides applied. Acceptable alternative to the application of chemical pesticides is seed inoculation with the bacteria P. fluorescens and T. harzianum that express antagonism against pathogenic fungi. Since the benefit bacteria do not express sensitivity to the low fungicide doses, on the soils heavily infected with the fungi – the root decay agents on sugar beet, positive effect was accomplished by combining seed inoculation with the bacterium P. fluorescens and the seed treatment with low doses of fungicides. Pathogenic fungi R. solani is found to be the most serious issue, so the influence of the bacterium P. fluorescens to the pathogenic fungi – the root decay agent of sugar beet, has been investigated.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA