Suppression of Clubroot Formation in Chinese Cabbage by the Chitin Compost and Broth. Agric. Chem. Biotechnol. 49(4), 171-175 (2006)

[Tae-Ho Han]

Suppression of Clubroot Formation in Chinese Cabbage by the Chitin Compost and Broth. Agric. Chem. Biotechnol. 49(4), 171-175 (2006)

Chitin compost and broth were used to suppress clubroot. Individual cabbage seedlings were
transplanted into pots (3500 ml) containing a mixture of 3% chitin compost and 50 ml of chitin broth
(T1) or the same quantity control compost and control compost broth (T2). The media in each pot was
then infected with Plasmodiophora brassicae. Samples were taken at 6, 7 and 8 weeks after
transplanting. The population of chitinase producing bacteria in T1 was consistently larger than that
observed in T2. Chitinase activity in the T1 rhizosphere was two-fold greater than that of T2 at each
time point observed. Shoot dry weight, leaf number and leaf area in T1 were enhanced 20%, 10% and
12% relative to those seen in T2, respectively. The disease index and root mortality at 8 weeks after
transplanting were reduced by 50% and 25% in T1 compared to T2, respectively. Results presented in
this study are strongly indicative that chitin compost and broth suppress clubroot in Chinese cabbage.
Key words: chitin compost; chitin broth; clubroot; disease index.

2006 Agric Chem Cabbage Chitin.pdf