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Potato root infection by Rhizoctonia solani anastomosis group-3 and Colletotrichum coccodes under current and future spring weather in northern Italy

Published online by Cambridge University Press:  10 February 2016

L. M. MANICI ,
F. CAPUTO  and
F. NICOLETTI
L. M. MANICI*
Affiliation:
Council for Agricultural Research and Economics (CREA), Research Centre for Industrial Crops, Bologna, Italy
F. CAPUTO
Affiliation:
Council for Agricultural Research and Economics (CREA), Research Centre for Industrial Crops, Bologna, Italy
F. NICOLETTI
Affiliation:
Council for Agricultural Research and Economics (CREA), Research Centre for Industrial Crops, Bologna, Italy
*
*To whom all correspondence should be addressed. Email: luisa.manici@entecra.it
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Summary

A study was performed in controlled conditions to reproduce cold and warm spring regimes in the east Po valley, northern Italy with a temperate subcontinental climate, to evaluate whether and to what extent spring weather regimes favour the attack of Rhizoctonia solani or Colletotrichum coccodes on potato, in view of predicted climate change. The main experiment, preceded by a controlled chamber set of tests to quantify response to temperatures of R. solani anastomosis group (AG)-3 and C. coccodes strains, showed that limit temperatures (minimum, maximum and optimum of colony radial growth) of R. solani AG-3 are 6 °C lower than those of C. coccodes. Then, a trial to reproduce early growth stages of potato was performed in phytotrons with sprouts of cvar Hermes to simulate cold and warm spring regimes with two different relative soil moisture contents. That simulation was carried out on native non-sterilized soil samples which were co-inoculated artificially with R. solani AG-3 and C. coccodes. Species-abundance findings of fungal root colonization in potato roots and molecular quantification (quantitative polymerase chain reaction) of C. coccodes and R. solani AG-3 inoculum growth in soil showed that: (i) C. coccodes is more competitive than R. solani AG-3 in colonizing potato root both in warm and cold spring regimes; (ii) R. solani AG-3 infected potato roots only in the coldest spring regimes regardless of soil moisture content; (iii) soil temperature is the greatest factor that influences root colonization of C. coccodes and R. solani as well as that of soil inhabiting fungi including some potential antagonists; (iv) R. solani AG-3 and C. coccodes seem to greatly increase in soil under the relative driest and warmest spring weather regimes expected according to the mean scenarios of climate changing in northern Italy; (v) binucleate Rhizoctonia AG-A, a common non-pathogenic fungus indigenous to agricultural soil of that area, appears to be antagonistic towards root fungal pathogens of potato.

Type
Crops and Soils Research Papers
Information
The Journal of Agricultural Science , Volume 154 , Issue 8 , November 2016 , pp. 1413 - 1424
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Copyright
Copyright © Cambridge University Press 2016 

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