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SESSION 5: DISEASE CONTROL AND FORECASTING MODELS
P129 - Screening of antagonistic activity of
indigenous bacteria against two Fusarium species
S. Mezaache-Aichour, N. Sayah, N. Haichour, A. Guechi, M. M. Zerroug
Laboratory of Applied Microbiology, Faculty of Natural and Life Sciences, University of Sétif “I”, 19000,
Sétif, ALGERIA.
E-mail: mezaic2002@yahoo.fr; med.zerroug@gmail.com
The genus Fusarium is one of the most important fungi that include many
pathogenic species, causing a wide range of plant diseases. The genus Fusarium
is a ubiquitous soil saprophyte and has been isolated from debris and roots,
stems and seeds of a wide variety of plants. Since, resistant plant varieties are
not available for several soil-borne pathogens and chemical control is often
insufficiently effective in soil. The enhancement of disease suppressive properties
of soils will limit disease development, thus, being of great importance for
sustainable agriculture as well as organic farming systems. The aim of this
research is to test the inhibitory effect of some indigenous bacterial strains
isolated from two potato fields, in Sétif (east of Algeria) against two fusaria strains,
using the confrontation test. The results showed that among 50 bacterial strains
only 11 showed an important antifungal activity against the tested
phytopathogenic fungi, Fusarium oxysporum f. sp. albedinis and Fusarium solani
var. coeruleum. This activity varies within the fields. The percent inhibition rate
was from 0 to 92.30 %, especially against Fusarium oxysporum f. sp. bi with a
rate of 92 %. The strain 8 from the first field inhibited Fusarium oxysporum f. sp.
albedinis with 53,84 % and had no effect against Fusarium solani var. coeruleum,
while the strain17 from the second field inhibited Fusarium solani var. coeruleum
with 85 % and had a very low effect against Fusarium oxysporum f. sp. albedinis
with 1,25 %.
Keywords: Fusarium, indigenous bacteria, antagonism, biocontrol
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