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Yellow (Cyperus esculentus) and purple nutsedge (Cyperus rotundus) are not injured by increasing root-knot nematode (Meloidogyne incognita) population density

Published online by Cambridge University Press:  12 June 2017

Jill Schroeder ,
Stephen H. Thomas  and
Leigh W. Murray
Stephen H. Thomas
Affiliation:
Department of Entomology, Plant Pathology, and Weed Science, New Mexico State University, Las Cruces, NM 88003–0003
Leigh W. Murray
Affiliation:
University Statistics Center, New Mexico State University, Las Cruces, NM 88003–0003
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Extract

Greenhouse studies in 1995 and 1996 examined the response of yellow and purple nutsedge to inoculation with increasing densities of southern root-knot nematodes. Yellow and purple nutsedge root and shoot weight, numbers of leaves and tubers produced, and tuber weight were unaffected across 17 nematode inoculum densities that ranged from 0 to 20,000 eggs per 15-cm pot, four times the maximum nematode density recorded under field conditions in New Mexico. Hence, yellow and purple nutsedge do not exhibit a classic threshold response to root-knot nematodes. Moreover, the results suggest that the relationship between these nematodes and perennial nutsedges is an example of a positive biological interaction. The relationship between root-knot nematodes and purple nutsedge appears to be one of commensalism, because while the nematodes reproduced effectively, purple nutsedge reproduction was not related to final nematode populations. The relationship between yellow nutsedge and root-knot nematodes appears to be a mutually beneficial one, because yellow nutsedge tuber number and weight and root weight increased as final nematode populations increased. However, while both nutsedges were unaffected in the absence of the association, root-knot nematodes cannot survive without a host plant.

Keywords

Yellow nutsedge, Cyperus esculentus L. CYPESpurple nutsedge, Cyperus rotundus L. CYPROsouthern root-knot nematode, Meloidogyne incognita Kofoid & White (Chitwood), host race 3.Threshold response, weed–nematode interactions, weed-pest interactions, positive interaction, commensalism.
Type
Weed Biology and Ecology
Information
Weed Science , Volume 47 , Issue 2 , April 1999 , pp. 201 - 207
Copyright
Copyright © 1999 by the Weed Science Society of America 

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