Journal of Nematology (2007) 39, 77-78

N. Viaene and S. Baidya (2007)
Influence of pH and infestation time on the interaction between Pratylenchus penetrans and P. crenatus in corn
Journal of Nematology 39 (1), 77-78
Abstract - Society of Nematologists 46th Annual Meeting San Diego, California July 28-August 1, 2007
Abstract: The lesion nematodes Pratylenchus penetrans (Pp) and P. crenatus (Pc) occur frequently together in one field on a same crop. It is unknown how they influence each other's reproduction and how this interaction differs with pH. We added 1,500 individuals of both species to pots planted with corn in the following Pc:Pp ratios: 0:0, 100:00, 75:25, 50:50 and 0:100. In half of the pots, both species were added simultaneously, in the other half, Pp was added 2 weeks after Pc. Numbers of nematodes in roots and soil were counted 14 weeks after the last soil infestation. The test was performed twice: at pH 5.5 and at pH 6.8. Reproduction of Pc was unaffected by the quantity of Pp, at both pH. Pc reproduced more, however, when Pp was added 2 weeks later than when both species were added simultaneously, but at pH 5.5 only. At the lower pH, Pc generally reproduced more than at pH 6.8. Soil pH did not influence reproduction of Pp. Reproduction of Pp decreased as the proportion of Pc in the inoculum increased when both species were added at the same time. Adding Pp 2 weeks after Pc also reduced the reproduction of Pp. Favouring Pc, e.g., through a low soil pH, could help in reducing Pp, the most plant-damaging species of the two. Also, earlier activity of Pc than Pp in the field could negatively influence reproduction of Pp.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Nicole M. Viaene

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pratylenchus penetrans	Maize/corn (Zea mays)
	Pratylenchus crenatus	Maize/corn (Zea mays)