Efficacy of methyl iodide soil fumigation for control of Meloidogyne incognita, Tylenchulus semipenetrans and Heterodera schachtii

in Nematology
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Abstract

Sigmoidal dose-response curves were derived for Meloidogyne incognita, Tylenchulus semipenetrans, and Heterodera schachtii treated with methyl iodide or methyl bromide under laboratory and field conditions. Laboratory dose-response experiments were conducted in 1.9 dm3 fumigation jars in three soil types. Field experiments were conducted in a San Emigdio sandy loam and a Carsetas loamy sand previously infested with M. incognita. Muslin sample bags containing either roots or soil infested with T. semipenetrans and H. schachtii were buried in each field plot. M. incognita was bioassayed on tomato roots and survival of other nematodes was assayed by Baermann funnel extraction. A comparison of the methyl bromide: methyl iodide ratios at the EC(ED)90 rates indicated that, averaged over all treatments, methyl iodide was 4.67 and 1.77 times more potent than methyl bromide in laboratory and field experiments, respectively. Efficacite de la fumigation des sols au iodure de methyle pour le controle de Meloidogyne incognita, Tylenchulus semipenetrans et Heterodera schachtii - Des courbes sigmoides dose-reponse ont ete etablies pour Meloidogyne incognita, Tylenchulus semipenetrans et Heterodera schachtii traites au iodure de methyle ou au bromure de methyle au laboratoire et au champ. Les experimentations dose-reponse au laboratoire ont ete faites dans des conteneurs de 1,9 dm3 avec trois types de sol. Les experimentations au champ ont ete realisees sur limon sableux San Emiglio et sable limoneux Carsetas prealablement infestes par M. incognita. Des sacs a echantillon en mousseline contenant ou bien des racines ou bien du sol infestes par M. incognita, T. semipenetrans et H. schachtii ont ete enterres dans chaque parcelle. La survie de M. incognita a ete evaluee par un test biologique sur des racines de tomate et celle des autres nematodes par extraction au Baerman. Une comparaison des rapports bromure de methyle/iodure de methyle aux taux EC(ED)90 a montre que, en moyenne sur tous les traitements, l'iodure de methyle a ete respectivement 4,67 et 1,77 fois plus efficient que le bromure de methyle au laboratoire et au champ, respectivement.

Efficacy of methyl iodide soil fumigation for control of Meloidogyne incognita, Tylenchulus semipenetrans and Heterodera schachtii

in Nematology

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