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Abstract
Nymphs of Myndus crudus Van Duzee (Homoptera : Cixiidae), a vector of lethal yellowing (LY) of palms, develop in the root zones of grasses. Management of grasses under coconuts is a potential method of suppressing populations of this insect vector. To identify grasses unfavorable as hosts of M. crudus, six species of grasses grown in containers were exposed to field collected adult M. crudus. Host suitability was measured by the relative degree of colonization of the roots of these grasses by immatures, compared torootsof Stenotaphrumsecundatum (Wait.) Kuntze, a know host of M. crudus immatures. Of the grasses tested. Hyparrhenia rufa (Nees) Stapf, proved to be the poorest breeding host of this insect, and may prove useful as a potential ground cover in coconut plantations to reduce the incidence of the vector and thus the spread of LY. ----- Les nymphes de Myndus crudus Van Duzee, un vecteur du jaunissement létal du palmier se développent dans les racines des herbes. Le contrôle des herbages poussant sous les cocotiers est une méthode potentielle pour supprimer les populations de cet insecte vecteur. Pour identifier les herbes mauvais hôtes de M. crudus, six espèces d'herbes, cultivées en containers, ont été exposées à des adultes de M. crudus récoltés sur le terrain. La qualité d'hôtes des espèces testées a été mesurée par le degré relatif de colonisation des racines de ces herbes comparé aux racines de Steriotphrum secundatum, un hôte connu de M. crudus. Parmi les herbes testées, Hyparrhenia rufa (Nees) Stapf, s'est montrée l'hôte le plus médiocre de cet insecte et s'avère donc intéressante comme plante de couverture en cocoteraie pour réduire l'impact du vecteur et en conséquence la dispersion du J.L.
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