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Yellow and Purple Nutsedge and Chile Peppers Host Southern Root-Knot Nematode

Published online by Cambridge University Press:  12 June 2017

Jill Schroeder ,
Stephen H. Thomas  and
Leigh Murray
Jill Schroeder
Affiliation:
Dep. Entomol., Plant Pathol. Weed Sci., New Mexico State Univ., Las Cruces, NM 88003
Stephen H. Thomas
Affiliation:
Dep. Entomol., Plant Pathol. Weed Sci., New Mexico State Univ., Las Cruces, NM 88003
Leigh Murray
Affiliation:
Dep. Exp. Stat., New Mexico State Univ., Las Cruces, NM 88003
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Abstract

Yellow and purple nutsedge and southern root-knot nematode are common pests in intensively managed chile pepper production. Greenhouse studies were conducted to identify relationships among nutsedge species, chile peppers, and root-knot nematode. All practical combinations of the plant species and nematodes were grown together in pots for 14 wk. Both nutsedges and root-knot nematode reduced chile pepper height over time with no interaction. Competition from purple nutsedge or either nutsedge species plus nematodes reduced chile pepper top weight more than yellow nutsedge or nematodes alone. All pest combinations reduced chile pepper root weight. Chile pepper and nematodes individually reduced rates of shoot production, as well as top and belowground weights of yellow and purple nutsedge. Chile pepper and purple and yellow nutsedge hosted root-knot nematode host race 3. Nematode egg production was greater on chile pepper roots than on either nutsedge species. Purple nutsedge growing with chile pepper increased nematode production g−1 of chile pepper root. Purple nutsedge grown with chile pepper was the most detrimental for chile pepper growth, but most efficient for maintaining the root-knot nematode population on the least amount of root biomass. Since root-knot nematode infests yellow and purple nutsedge, and few nematicides are available for nematode control, root-knot nematode cannot be managed with crop rotation if nutsedge is not controlled.

Keywords

Yellow nutsedge, (Cyperus esculentus L. #3 CYPES)purple nutsedge, (Cyperus rotundus L. # CYPRO)chile peppers, (Capsicum annuum L. ‘NM 6-4′)Southern root-knot nematode, (Meloidogyne incognita (Kofoid and White) Chitwood, host race 3)Weed ecologypest interactionsCapsicum annuumCYPESMeloidogyne incognitaCYPRO
Type
Special Topics
Information
Weed Science , Volume 41 , Issue 1 , March 1993 , pp. 150 - 156
Copyright
Copyright © 1993 by the Weed Science Society of America 

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