Abstract

Effects of irrigation on the dynamics of soil populations of Phytophthora citrophthora have been studied in three citrus orchards in East Sicily (Italy). Significant increases of inoculum levels were detected 24 h after irrigation. In one orchard throughout summer, population of P. citrophthora beneath the tree canopy was more than 15 propagules g‐1 soil, a value which is considered a threshold level for root rot infections.

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