Articles
EVALUATION OF SOME BIOLOGICAL METHODS OF PINK ROOT ROT CONTROL ON LEEK
Article number
635_24
Pages
187 – 194
Language
English
Abstract
A field experiment was initiated in order to examine various methods of biological control of pink root rot on leek grown in naturally infested soil.
Fresh garlic extracts in concentrations of 1 and 2% were used in different ways: dipping of seedling roots in a water solution before planting with or without additional drenching of the plants in the field with the same solution, and drenching only of plants in the field ones or twice, after 3 and 6 weeks from the planting date.
In another treatment an isolate of Trichoderma viride, tolerant to iprodione was used for inoculation of peat substrate before seeds were sown, combined with or without dipping of transplant roots in a water suspension of the fungus, as well as with additional drenching of plants in the field with a 2% suspension of Rovral (iprodione). In chemically controlled treatments 0.1% Topsin 70 WP (thiophanate-methyle) and 2% Rovral FLO 255 SC were used for dipping of leek transplants.
Results of the three years study proved the suitability of the biological control method for the control of pink root rot in leek production.
The most simple and effective disease control was provided by dipping of the leek transplant roots in a 2% extract of fresh garlic solution, but also the other methods of using this extract were efficient and gave similar effect as the 0.1% Topsin application.
Treatment with garlic extract as well as with Trichoderma viride resulted in less inhibited growth of the fungal mycelium in leek roots than chemical control with Rovral and Topsin.
Fresh garlic extracts in concentrations of 1 and 2% were used in different ways: dipping of seedling roots in a water solution before planting with or without additional drenching of the plants in the field with the same solution, and drenching only of plants in the field ones or twice, after 3 and 6 weeks from the planting date.
In another treatment an isolate of Trichoderma viride, tolerant to iprodione was used for inoculation of peat substrate before seeds were sown, combined with or without dipping of transplant roots in a water suspension of the fungus, as well as with additional drenching of plants in the field with a 2% suspension of Rovral (iprodione). In chemically controlled treatments 0.1% Topsin 70 WP (thiophanate-methyle) and 2% Rovral FLO 255 SC were used for dipping of leek transplants.
Results of the three years study proved the suitability of the biological control method for the control of pink root rot in leek production.
The most simple and effective disease control was provided by dipping of the leek transplant roots in a 2% extract of fresh garlic solution, but also the other methods of using this extract were efficient and gave similar effect as the 0.1% Topsin application.
Treatment with garlic extract as well as with Trichoderma viride resulted in less inhibited growth of the fungal mycelium in leek roots than chemical control with Rovral and Topsin.
Authors
A. Biesiada, E. Kolota, S. Pietr, M. Stankiewicz, K. Matkowski
Keywords
Pyrenochaeta terrestris, Trichoderma viride, garlic extract, fungicides, yield
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