STUDIES ON THE EFFICACY OF SOME BACTERIA AND FUNGI FOR CONTROL OF GLOBODERA RESTOCHIENSIS

Biocontrol potential of B. thuringiensis var. berliner (Kustom larvoWT-1 ml/pot), var. kurstaki (Kostar 76 LW-1 ml/pot), Saccharopolyspora spinosa(Treisr 480 EC-1 ml/pot), Fusarium spp. (1; 2; 4 g mycelium/pot) and Trichodermaspp. (1; 5; 10 g mycelium/pot) against G. rostochiensis on potato was examined inglasshouse. They were applied to the soil with the planting. All treatmentsimproved the plant growth and yield of potatoes, being greatest with Kostar76 LW. The greatest increase in the yield occurred in the Oxamyl application(16.6%) followed by Kostar 76 LW or Fusarium spp. (9.9%), Kustom larvo WT(8.2%) and Trichoderma spp. (6.6%). The percentage of infected females was from40.5% to 48.9%, from 29.6% to 49.3% and from 28.1% to 31.5% when appliedfungi Fusarium spp. Trichoderma spp. and bacterial preparations respectively. Thebioagents caused significant inhibitory effect on multiplication of the nematode.Reproduction rates decreased from 27.7% to 33.3% by bacterial preparations andfrom 36.0% to 44.4% by both fungi in comparison with the control.