THE POSSIBILITY OF CONTROLLING SCLEROTIUM ROLFSII ON SOYBEAN (GLYCINE MAX) USING TRICHODERMA AND TEBUCONAZOLE*)

Authors

  • OKKY S. DHARMAPUTRA SEAMEO BIOTROP

DOI:

https://doi.org/10.11598/btb.1994.0.7.113

Abstract

ABSTRACT The possibility of  controlling S.  rolfsii on soybean  (Glycine max) var. Rinjani using T. aureoviride  and Tebuconazole  under  field  conditions was  studied. The  experiment was  conducted  at  the  experimental  plot  of SEAMEO BIOTROP. The pathogen was mixed with the soil (2 kg/plot) 4 days before the inoculation of the antagonist  (2.25 kg/plot). The measurement of each plot was 2.5 x 6 m2. N, P and K (120 kg/ha) were applied at the same day with the inoculation of the pathogen. Soybean seeds were planted 7 days after the inoculation of the antagonist. The distance between plants and between plots were 20 and 40 cm, respectively. The  fungicide  at  concentration  of  100  g/ha  (in  vitro  concentration)  and  210  g/ha  (field  or recommended concentration) were applied using 2 methods, i.e. 1) spraying on the planting hole at the same day as the planting of soybean seeds, and 2) spraying on the soil surrounding the plants 7 days after planting. Soils that were neither inoculated with the antagonist nor the fungicide were used as controls. Three replications (3 plots) were used for each treatment (including the control). The results showed that the inoculation of the antagonist, the concentrations of the fungicide, and time of application gave very significant differences in the percentages of the plants infected by the pathogen and significant differences in seed production; while the interaction between the inoculation of the antagonist and the concentrations of the fungicide, between the concentrations of the fungicide and the time of application, and between the inoculation of the antagonist, the concentrations of the fungicide and the time of application did not  give  significant  differences  either  in  the  percentages  of  the  plants  infected  by  the  pathogen  or  seed production. The percentage of plants infected by the pathogen was lower on soil inoculated with the antagonist (31.6%) than on soil not inoculated with the antagonist (52.9%). The percentage of plants infected by the pathogen was lower on soil treated with the fungicide either at in vitro concentration (37.5%) or at field concentration (37.4%) than on the soil not treated

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