부산대학교 도서관

This study evaluated the application feasibility of a strain of Bacillus firmus, CGMCC No.1.2010 WP, to possess biocontrol activity against root-knot nematode on tomato in greenhouse. Three field trials were conducted in randomized complete block design (RCBD). The B. firmus ＞1x10^9 CFU/g wettable powder 400-fold, 800-fold, 1200-fold dilutions were used as test group. The reference group was 500 g/L fluopyram SC of 4,000-fold dilution, and sterile water was used as control. Soil nematode numbers of root-knot nematode in the control groups were between 33.6 and 42.8 nematodes/100 g soil 60 days after the experimental treatment, and the numbers in B. firmus groups and fluopyram groups were 20.8-30.8 and 10.3-22.4 nematodes/100 g soil, respectively. Those numbers of nematodes of both treated groups were significantly different from the control group (p＜0.05). The disease severities in the control groups were between 43.8% and 51.6%, and the disease severities in B. firmus groups and fluopyram groups were 17.1-21.7% and 11.2-18.8%, respectively. The disease severities of both treated groups were also significantly different from the control group (p＜0.05). The disease control rates in the B. firmus groups and fluopyram groups were 58-61% and 63.6-76.2%, respectively. According to the above described results, the B. firmus CGMCC No.1.2010 WP had the potential to control root-knot nematode on tomato in the fields.