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n African Entomology - Biological control of two species (Asteraceae: Eupatorieae) in South Africa

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Abstract

(Spreng.) R.M.King & H. Rob. and (Regel) R.M. King & H.Rob. (Asteraceae: Eupatorieae), originally from Mexico, are invasive in many countries. These plants produce thousands of wind- and water-dispersed seeds which enable them to spread rapidly and invade stream banks and moist habitats in areas with high rainfall. Two biological control agents, a shoot-galling fly, Stone (Diptera: Tephritidae), and a leaf-spot fungus, Crous & A.R. Wood (Mycosphaerellales: Mycosphaerellaceae), were introduced against in South Africa in 1984 and 1987, respectively. Both established but their impact is considered insufficient. Exploratory trips to Mexico between 2007 and 2009 to search for additional agents on produced a gregarious leaf-feeding moth, sp. (Lepidoptera: Noctuidae), a stem-boring moth, probably (Razowski) (Lepidoptera: Tortricidae), a leaf-mining beetle, (Chapuis) (Coleoptera: Chrysomelidae: Cassidinae), and a leaf-rust, (Arthur) Arthur (Pucciniales: Pucciniosiraceae) all of which have been subjected to preliminary investigations. Following its success in Hawaii, the white smut fungus, R.W. Barreto & H.C. Evans (Entylomatales: Entylomataceae), was introduced in 1989 to South Africa against . Its impact has not been evaluated since its establishment in 1990 in South Africa. By 2009, however, was rarely observed in the field and was noted to be present over most of the range of the weed, providing circumstantial evidence that the weed has been brought under biological control by in South Africa.

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/content/ento/19/1/EJC32921
2011-03-01
2016-12-04
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