Suppressive effects of palisade grass (Brachiaria brizantha) on Pratylenchus coffeae

in Nematology
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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.

Suppressive effects of palisade grass (Brachiaria brizantha) on Pratylenchus coffeae

in Nematology



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    Number of eggs and adults + juveniles inside roots of palisade grass. A: Eggs (test 1); B: Eggs (test 2); C: Adults + juveniles (test 1); D: Adults + juveniles (test 2). Bars are standard error of the mean. Different letters indicate significant difference among plants at the 5% level according to the Tukey HSD test with log(x+0.5)-transformed data.


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