Tag Archives: black scurf

877–885 R. Simson,, L. Tartlan, E. Loit and V. Eremeev
The effect of different pre-crops on Rhizoctonia solani complex in potato
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The effect of different pre-crops on Rhizoctonia solani complex in potato

R. Simson¹,*, L. Tartlan², E. Loit³ and V. Eremeev³

¹ Estonian Crop Research Institute, Department of Plant Biotechnology, Aamisepa 1, EE48309 Jõgeva, Estonia
² Estonian Research Institute of Agriculture, Department of Plant Sciences, Teaduse 13, EE75501 Saku, Estonia
³Estonian University of Life Sciences, Department of Field Crop and Grassland Husbandry, Kreutzwaldi 1, EE51014 Tartu, Estonia
*Correspondence: reijo.simson@etki.ee

Abstract:

Rhizoctonia disease in potato is widely distributed in Estonia. Field experiments with cv. ‘Red Fantasy’ were undertaken with seven pre-crop treatments at the Estonian Research Institute of Agriculture in 2009 and 2010. Monocropped potato, spring barley, spring barley underseeded with red clover, spring wheat, grain pea, spring oil seed rape and oil seed radish were involved in the study as pre-crops. Growing conditions on both years were rather optimal for potato growth but year 2010 was drier at early bulking stage. The effect of different pre-crops on Rhizoctonia solani complex was studied (i.e. incidence and severity of stem and stolon canker and black scurf) at 15, 30, 45, 60, 90 and 120 days after planting. Results indicated that pathogenfree
seed tubers are of primary importance in the disease control and no pre-crop was suppressive to disease if seed tubers had sufficient amount of inoculum. However, to achieve consistent reduction in disease development, inoculum-free seed tubers and crop rotation with non-host crops should be considered.

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245-250 V. Eremeev, I. Keres, B. Tein, P. Lääniste, A. Selge and A. Luik
Effect of different production systems on yield and quality of potato
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Effect of different production systems on yield and quality of potato

V. Eremeev, I. Keres, B. Tein, P. Lääniste, A. Selge and A. Luik

Institute of Agricultural and Environmental Science, Estonian University of Life Sciences,Kreutzwaldi St. 1, EE51014 Tartu, Estonia; e-mail: Viacheslav.Eremeev@emu.ee

Abstract:

In the experimental field of the Department of Field Crops and Grassland Husbandry the late maturing potato variety „Ants‟ was grown in the following variants: conversion to organic, N0P0K0, N50P25K95, N100P25K95 and N150P25K95. Pesticides were used in mineral fertilizer variants. In N0P0K0 and mineral fertilizers variants insecticide Fastac 50 was used. The total yield of tubers as well as the proportion of marketable tubers increased significantly with the use of mineral fertilizers (N50P25K95, N100P25K95 and N150P25K95). Tubers from conversion to organic and N0P0K0 variants had significantly higher starch content, compared to the variants where mineral fertilizers were used, but the overall yield of starch remained lower. Increasing the amount of nitrogen fertilizer is positively correlated with the nitrate content in the tubers. The number of tubers infected by potato brown rot and potato soft rot did not differ significantly, but there were fewer tubers infected with black scurf in conversion to the organic variant.

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