This high microbial activity
is possibly associated with high accumulation of plant exudates and
plant decomposition residues from the first crop cycle (Martínez et
al., 2009). Hardy and Sivasithamparam (1991) proposed that the
lytic activity of a large population of microorganisms suppresses or
kills Phytophthora spp. propagules. In this regard, the transmission
of P. parasitica was very low when potting mixwas not pasteurized
in an ebb-and-flow subirrigation system (