Weed Hosts of Meloidogyne arenaria and M. incognita Common in Tobacco Fields in South Carolina


  • E. C. Tedford
  • B. A. Fortnum


Thirty-two weed species common in South Carolina and one cultivar of tobacco were evaluated as hosts of Meloidogyne arenaria race 2 and M. incognita race 3 in the greenhouse. Egg mass production and galling differed (P 0.05) among weed species. Chenopodium album, Euphorbia maculata, and Vicia villosa were good hosts ofM. arenaria. Amaranthus palmeri, Rumex crispus, Amaranthus hybridus, Ambrosia artemisiifolia, lpomoea hederacea var. integriuscula, Setaria lutescens, Sida spinosa, Portulaca oleracea, and Rumex acetosella were moderate hosts. Taraxacum officinale, Ipomoea hederacea, Cyperus esculentus, Cynodon dactyIon, Echinochloa crus-galli, Eleusine indica, Sorghum halepense, Setaria viridis, Digitaria sanguinalis, and Datura stramonium were poor hosts for M. arenaria. Amaranthus palmeri, Amaranthus hybridus, Chenopodium album, Euphorbia maculata, Setaria lutescens, Vicia villosa, Sida spinosa, Rumex crispus, and Portulaca oleracea were moderate hosts and Ipomoea hederacea var. integriuscula, Xanthium strumarium, Cyperus esculentus, Cynodon dactylon, Paspalum notatum, Eleusine indica, Setaria viridis, and Rumex acetosella were poor hosts for 34. incognita. None of the above were good hosts for M. incognita. Tobacco 'PD4' supported large numbers of both nematode species. Key words: host suitability, Meloidogyne arenaria, M. incognita, Nicotiana tabacum, root-knot nematode, tobacco, weed.