The suppressive effects of palisade grass (Brachiaria brizantha) cv. MG5 on Pratylenchus coffeae were tested in pot and seedling tray experiments and under field conditions. In pot tests, four isolates of P. coffeae were tested by inoculating 500 mixed life stages of each isolate on 5- or 7-week-old palisade grass plants. The nematode number in palisade grass was significantly lower than in susceptible cucumber in all isolates and below 20% of the inoculated level 69-86 days after inoculation. In seedling tray tests, the number of eggs and adults + juveniles in palisade grass roots was examined 5-25 days after inoculation (dai) of 200 mixed life stages of an isolate of P. coffeae to a 3-week-old seedling. The number of adults + juveniles in palisade grass roots was not statistically different from sorghum and black oat 5 and 10 dai, while the number of eggs and adults + juveniles was significantly lower than these two plants 20 and 25 dai. In field plot tests, palisade grass was cultivated for approximately 4 months in 2011 and 2012. The P. coffeae density after palisade grass cultivation was significantly lower than that after bare fallow in 2011, whereas the nematode density was not significantly different between these two treatments in 2012. Rates of lesions on sweet potatoes cultivated after growing palisade grass were significantly lower than those after growing sorghum or guinea grass, but not significantly different from that after fallow. These results indicated that the cultivation of palisade grass cv. MG5 has a nematode suppressive effect that is comparable to fallow treatments.
Population density of Pratylenchus spp. in pastures of Brachiaria spp. and its influence on the forage availability and quality.
Use of antagonistic plants and natural products. In:
Nematology advances and perspectives.
Vol. 2 Nematode management and utilization. Wallingford, UKCAB International pp.
Studies on the control of root rot nematode disease of sweet potato caused by Pratylenchus coffeae (Zimmermann, 1898) Goodey, 1951.
Bulletin of the Miyazaki Agricultural Experiment Station51-121.
Distribution of main plant-parasitic nematodes in sweet potato and taro fields in Kyushu and Okinawa, Japan. 1. Survey in the central and southern parts in Kyushu Island (Kumamoto, Miyazaki and Kagoshima Prefs) and development of an effective DNA analysis method for species identification.
Kyushu Plant Protection Research46112-117.
Characterization of resistance to Pratylenchus thornei (Nematoda) in wheat (Triticum aestivum): attraction, penetration, motility, and reproduction.
Microevolutionary trend in Pratylenchus coffeae sensu stricto (Nematoda: Pratylenchidae): the diversity in PCR-RFLP phenotype, compatibility on host plants and reproductive segregation.
Japanese Journal of Nematology3357-76.
Suppression of root-knot nematode damage to succeeding sweet potato by summer-sown cultivation of an oat variety, “Tachiibuki”.
Japanese Journal of Nematology381-7.
Correlation between the suppressive effects of several enemy plants and the recovery of Pratylenchus coffeae and Meloidogyne incognita populations in taro and sweet potato fields in southern Kyushu.
Kyushu Plant Protection Research4283-88.
Antagonistic effects of hybrid sorghum and other gramineous plants on two species of Meloidogyne and Pratylenchus.
Japanese Journal of Nematology3018-29.