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Cleopus japonicus Wingelmüller (Coleoptera: Curculionidae) has been investigated as a potential biocontrol agent against Buddleja davidii Franchet (Buddlejaceae), an invasive weed of exotic and indigenous forests in New Zealand. The impact of feeding damage by C. japonicus, at densities of 0, 3, 10 or 20 larvae per plant (from 2 nd instar), on the growth of buddleia plants was assessed in a quarantine laboratory. Matured larvae were replaced every 11 days until, after seven weeks, the effects of defoliation were assessed. Grazing damage increased with larval density and in the high density treatment (20 larvae per plant), 83% of expanded leaves had more than 50% of the leaf area grazed. One third of the plants in the high density treatment died, presumably as a result of grazing, whereas there was no mortality in the control and light grazing (3 larvae per plant) treatments. Grazing resulted in a significant reduction in main stem height, total stem and branch length, and dry weight of roots and shoots, primarily in the medium and high density treatments. The results suggest that, following permission to release and successful establishment, C. japonicus hould successfully suppress buddleia growth.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Impact of the defoliator <i>Cleopus japonicus</i> (Coleoptera: Curculionidae) on <i>Buddleja davidii</i> in the laboratory