Fungicidal effect of nematicides on nematode trapping fungi

Abstract

Fungicidal effect of nematicides on the nematode trapping fungi was examined byfumigating in a glass cylinder (in vitro) at three dosages of chemicals at 25°C, for 24 hr. Another fumigation experiment was also conducted in a glass cylinder or in vinyl bag containing sandy loam soil infested with Meloidogyne incognita or volcanic ash soil infested with M. hapla respectively, at a dosage for conventional nematode control, at 25° for 4 days. Nematode population was determined by the Baermann funnel technique or cucumber gall index. Nematode trapping fungi were detected by flax trap method or soil disc method. Nematicidal effect of the chemicals tested wasrecognized in all treatments without significant differences in the effect among the chemicals. Fungicidal effect of fumigation increased in order of dibromochloropropane (DBCP), dibromoethane (EDB), methylbromide (MB) <dichloropropene-dichloropropane (D-D) <chloropicrin (CP), ammonium-Nmethylisothiocarbamate (NCS). Activity of the nematode trapping fungi after fumigation was evaluated by the decrease in the population density of M. incognita and M. hapla 8 days since reinoculation, which had been made 30 days after fumigation, with the results that the trapping fungi of the DBCP and EDB treatment have proved to be most activ_??_an those of other treatments.