Nematology (2013) 15, 931-938

Erika Sato, Ichi Okumura, Yoshihiro Kokatsu and Koki Toyota (2013)
Effects of the density of root-lesion nematode (Pratylenchus penetrans), soil chemical and microbial properties on the damage to Japanese radish
Nematology 15 (8), 931-938
Abstract: The density of Pratylenchus penetrans in soil is known to be a major determinant in the severity of damage to Japanese radish, but soil chemical and microbial properties may also affect the severity. This study investigated the relationships between damage and the density of P. penetrans, soil chemical properties, such as pH (H₂O), EC, available phosphate, NO₃-N, NH₄-N, total carbon and nitrogen, and microbial properties, such as microbial biomass and fungal and bacterial community structures, in 48 different plots in a field for 2 years. The density of P. penetrans estimated with real-time PCR was most significantly correlated with the damage to radish in both 2010 and 2011. The damage to radish caused by P. penetrans and the nematode density were negatively correlated with total carbon in soil in both years, suggesting that soil management leading to increased soil C could decrease the density of P. penetrans and hence the damage. Multiple regression models including the density of P. penetrans and the soil properties suggested that damage to radish was predictable with a higher probability for some of the soil chemical properties, such as total C and N, and the density of P. penetrans. The community structures of soil fungi and Pseudomonas spp. on the radish surface were different depending on the levels of damage to radish and the densities of P. penetrans. The results suggested that the damage to radish and the density of P. penetrans might be affected by the soil microbial community structure.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Koki Toyota

Research topic(s) for pests/diseases/weeds:
damage/losses/economics
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pratylenchus penetrans	Radish (Raphanus sativus)	Japan