Wirkung des pflanzengesundheitsfördernden Rhizobakteriums Agrobacterium radiobacter Stamm G12 gegen den Kartoffelzystennematoden Globodera pallida bei unterschiedlicher Temperatur und Bodenfeuchte

Influence of temperature and soil moisture on the biological control of the potato-cyst nematode Globodera pallida using the plant-health-promoting rhizobacterium Agrobacterium radiobacter Treatment of potato tubers with the plant-health-promoting rhizobacterium A.radiobacter (G 12) resulted in significant (P 0.05) reductions in G. pallida penetration (25%) in green-house studies conducted in a non-sterilized sandy-loam soil. Significant reductions (P 0.05) in nematode infection were obtained when soil moisture was maintained between 60 and 90% of field capacity. When moisture levels were held at 30% of field capacity, nematode infection was also reduced, but not significantly. A. radiobacter repeatedly reduced nematode root-infection levels but did not affect the final population density. A. radiobacter reduced the hatch of G. pallida significantly (P 0.01) in vitro up to 70%. The bacterium effectively reduced nematode hatch at both 20 and 25°C.