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Epidemics of Rhizoctonia Root Rot in Association with Biological and Physicochemical Properties of Field Soil in Bean Crops
Author(s) -
Naseri Bita
Publication year - 2013
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/jph.12077
Subject(s) - organic matter , biology , soil water , rhizoctonia , agronomy , silt , root rot , soil organic matter , rhizoctonia solani , incidence (geometry) , veterinary medicine , horticulture , mathematics , ecology , medicine , geometry , paleontology
During two growing seasons (2008 and 2009), the associations of Rhizoctonia root rot ( RRR ) with a number of soil properties were determined at different growth stages in 122 commercial bean fields in Z anjan, I ran. Mean RRR incidence at a level of 4–25% sand content was lower than that at 45–65% level. Damage by fly puparia had no significant effect on RRR incidence and occurrence. A greater RRR incidence was detected in field soils treated with fungicides compared with non‐treated soils. A lower RRR incidence was associated with the highest level of soil organic matter (1.2–1.8) compared with the lowest level, 0.4–0.8. The highest RRR incidence corresponded with no rhizobial nodulation compared with highly nodulated bean roots. RRR incidence was negatively correlated with soil silt and organic matter content at R 6–7 and R 9 growth stages. RRR‐affected fields were recognized with a greater soil pH ( V 3) and sand content ( R 9), and a lower silt ( R 9) and organic matter content ( R 6–7 and R 9) in comparison with RRR ‐free fields. Loadings and linear regressions between RRR incidence and principal component scores indicated that the most effective soil characteristic linked to the disease was silt at V 3, sand at R 6–7 and organic matter at R 9 stage. This new epidemiological information extends our knowledge of the bean– RRR –soil interaction on a regional basis.