A metalaxyl insensitive T. harzianum isolate (IMI No. 238493) hyperparasitized P.
aphanidermatum hyphae by coiling and direct penetration and produced volatile and non-
volatile toxic metabolites. In greenhouse tests T. harzianum grown in media with different
amounts of wheat bran: sawdust controlled damping-off of sugarbeet in artificially infested
soil. A linear correlation between rate of T. harzianum inoculum applied to the soil and
degree of disease control was observed. T. harzianum inoculum on sterilized wheat bran …

unknown. A metalaxyl insensitive Trichoderma harzianum isolate (lMI No. 238493) was
found antagonistic to Pythium aphanidermatum. This isolate hyperparasitised Pythium
hyphae by coiling and direct penetration and also produced both volatile and non-volatile
toxic metabolites. In glasshouse, T. harzianum growrn in media with different amounts of
wheat bran: saw dust controlled damping-off o'f sugarbeet, in soil artificially infested with the
pathogen. A linear correlation was obtained between rate of T. harzianum inoculum applied …