| Summary: | The study was to determine the effectiveness of Japanese bunching onion as a
biological control of clubroot disease on cabbage. The research was a field study
conducted at farmers' fields, in the village of Pagergunung, Grabak, Magelang,
Central Java from March to July 2012.
The experimental was the Complete Randomized Factorial Design. The first
factor was the way of control (live plants and extracts) and population of Japanese
bunching onion consisting of 6 levels used, namely : cabbage + Japanese bunching
onion (live plants) + 6, cabbage + Japanese bunching onion (live plants) + 8, cabbage
+ Japanese bunching onion (live plants) + 10, cabbage + Japanese bunching onion
(extract) + 6, cabbage + Japanese bunching onion (extract) + 8, cabbage + Japanese
bunching onion (extract) + 10. The second factor was the Japanese bunching onion
cultivar consisting of 2 levels used, namely : Lambau cultivar and Taiwan cultivar.
The collected data were analyzed by analysis of variance (Anova) applying level of
significance α = 5%, Whenever the significant differences among treatments were
found, futher analysis was carrier out by applying a Duncan's Multiple Range Test
(DMRT) of α = 5%, and also orthogonal contrast test performed to compare the mean
values with the control treatment.
The results showed that the interaction between the way of control (live plants
and extracts) and population of Japanese bunching onion factor with Japanese
bunching onion cultivar effected on wilting symptoms of cabbage in three weeks after
the planting and cabbage total dissolved solids (brix). Japanese bunching onion
Taiwan cultivar as biological control could reduce the wilting symptoms of cabbage
in the fifth weeks after the planting compared to monoculture planting cabbage. The
way of control (live plants and extracts) and population of Japanese bunching onion
factor showed the same effectiveness to reduce the wilting symptoms of cabbage. The
6, 8 and 10 population of Japanese bunching onion applied did not show increase
effectiveness to reducing the clubroot disease.
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