Investigation of suspected compatibility issues with the distinct biotype of C. Additional host-range testing might be required for some countries. odorata, particularly in drier areas of West Africa, Asia and Oceania where existing biological control agents are less effective. odorata, and the indication of its host specificity, this agent is recommended for consideration for the biological control of C. For this reason, in combination with the damage that C. The weevil's soil-dwelling pupal stage may facilitate survival during the dry season and persistence in areas that are subject to fire. reticulatus in South Africa and Venezuela, of which only one, A. In total, 44 non-target Asteraceae were examined for attack by C. odorata, using bouquets of cut plants, indicated that the weevil fed only on C.
Multiple-choice trials on three test-plant species and C. conyzoides, while oviposition occurred on C. odorata, Fleishmannia pratensis (Asteraceae: Eupatorieae) and A. During paired-choice tests on eight species of Asteraceae in the laboratory in Venezuela, adult feeding occurred on C. macrocephalum (Asteraceae: Tageteae), similar symptoms were encountered but it is considered unlikely that these were caused by C. In some cases, and in particular on Porophyllum ruderale subsp. reticulatus occurred on species other than C. reticulatus was abundant, indicated that no adult feeding damage, oviposition or galling identical to that caused by C. Field host-range surveys, conducted on 17 Asteraceae species at sites where C.
These studies were followed by more detailed field and laboratory studies in Venezuela. odorata, with the exception of a few eggs laid on Ageratum conyzoides (Asteraceae: Eupatorieae). Adult feeding or oviposition occurred only on C. reticulatus from Venezuela, using 25 species of Asteraceae and one of Amaranthaceae. Preliminary laboratory choice tests were conducted in South Africa on C. The Neotropical stem-galling weevil, Conotrachelus reticulatus (Coleoptera: Curculionidae), was considered for the biological control of the perennial shrub Chromolaena odorata (Asteraceae: Eupatorieae) in South Africa.
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