Roles of antagonistic microorganisms and metalaxyl for the control of root rot on tangerine marcottage caused by Phytophthora parasitica
1995
Chiradej Chamswarng | Suthamas Intasorn | Ampaiwan Paradornuwat (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Plant Pathology)
Efficacy of Trichoderma spp. used as solely or combination with a chemical fungicide, metalaxyl, was compared with the use of antagonistic bacteria, Bacillus sp. (isolate B-03) and gram negative bacterium (isolate UB-164) for the control of root rot on tangerine marcottage caused by Phytophthora parasitica. The mixture of Trichoderma powder and supplementing substrate (rice bran, compost and sand) was sprinkled at a rate 20 g/plant around the basal stem of tangerine marcottage, whereas, bacterial suspension prepared from powder preparation at a rate 5 g/200 ml per plant was drenched into soil. Results revealed that a mixture of T. hazianum (CB-PIN-01) used in combination with 2,500 ppm metalaxyl effectively reduced Phytophthora root rot of tangerine marcottages. In this treatment, root rot incidence was only 5.5 percent, while in a control with Phytophthora inoculation (+Php.), the disease occurrence was 63.9 percent. Moreover, average fresh weight of tangerine root in Trichoderma-metalaxyl (2,500 ppm) treatment was not significantly different from a control without Phytophthora inoculation (-Php). Antagonistic Bacillus sp. isolate B-03 could effectively reduce root rot incidence. It's disease control efficacy was not significantly different from the use of T. harzianum (CB-PIN-01) or 5,000 ppm metalaxyl.
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