Abstract
Crofton weed, Ageratina adenophora (Sprengel) King and Robinson, an asteraceous shrub from Mexico, was probably introduced into Southern Africa during the 1940s. Although it is a problem weed of crops, plantations and pastures in many parts of the world, A. adenophora is still largely restricted to the mist-belt region in Natal. In an attempt to contain the spread of the weed, a stemgalling fly, Procecidochares utilis Stone, and a leaf spot fungus, Phaeoramularia sp., have been established recently on A. adenophora in South Africa, but with little apparent effect as yet.
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