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VCRB :: Contents of Volume 57/2002 :: Detailed information


ESTIMATION OF EFFICIENCY OF GARLIC EXTRACT AND TRICHODERMA VIRIDE AGAINST PINK ROOT ROT  (PYRENOCHAETA TERRESTRIS (HANSEN) GORENZ,  WALKER ET LARSON) ON LEEK


Anita BIESIADA, Eugeniusz KOŁOTA, Stanisław PIETR, Marta STANKIEWICZ, Krzysztof MATKOWSKI
Agricultural University of WrocławRozbrat 7, 50-334 Wrocław, Poland


Summary

The aim of the study was to examine various methods of biological controlling of pink root rot on leek grown in naturally infested soil. 
There were tested 1% and 2% extracts of fresh garlic used in different ways: dipping of seedlings root in water solution before planting
with or without  supplementary saturation of plants in the field with the same solution, and the only saturation of plants in the field ones
or twice, after 3 and 6 weeks from the planting date. In another treatments isolates of Trichoderma viride tolerant to iprodione were used
for inoculation of peat substrate before seed sowing with or without treating of transplant roots by water suspension of this antagonistic
fungus as well as with supplementary saturation of plants in the field with 0.51% solution of iprodione (2% Rovral FLO 255 SC). In chemically
controlled treatments 0.07% thiophanate methyl (0.1% Topsin M 70 WP) and 0.51% iprodione were used for dipping of leek transplant roots.
Results of the three years study proved suitability of biological methods in controlling pink root rot in leek production. Effective biocontrol
against Pyrenochaeta terrestris was provided by both peat and root treatments with T. viride. Also 2% garlic extract used for dipping before
planting supplemented by single plants saturation in the field or twice saturation of growing plants on plots reduced pink root rot incidence
as good as fungicides application. Garlic extract as well as Trichoderma viride less inhibited colonisation of mycelium in leek roots than
chemical control with iprodione and thiophanate methyl.


keywords:leek, Pyrenochaeta terrestris, Trichoderma iride, garlic extract,fungicides, yield

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