Chemical control 53.34b 42.8a 48.1b
Biological control 53.34b 42.8a 48.1b
Potting mix þ non-amended compost 63.34a 36.2b 49.7a
Potting mix þ compost mix I 40.00c 5.5d 22.7c
Potting mix þ compost mix II 36.60d 5.2d 20.9d
Potting mix þ compost tea I 13.30f 11.6e 12.5f
Potting mix þ compost tea II