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Buddleia (Buddleja davidii Fr.) (Buddlejaceae) originates from central China. It is a significant weed of forestry plantations, where its rapid growth causes seedling mortality and/or significant growth losses. It is also a recognised weed in many protected natural areas of New Zealand. We have been evaluating within Invertebrate Quarantine the potential of Mecysolobus erro (Pascoe) to control buddleia, and its suitability for release in New Zealand. Feeding damage by M. erro limits the growth of buddleia plants. Adults feed on the terminal stem and fleshy leaf midribs and petioles, causing stem collapse and wilting at the feeding site. The larvae are stem borers that feed preferentially on the green tissue of young stems, causing them to collapse and die. The life cycle of M. erro, from egg to emergent adult, takes a mean of 51 days (SE=0.6) at 21°C. Adults are longlived; many laboratory-reared adults have lived for three years. Females are synovigenic, laying 1-2 eggs daily, but only when suitable stems are available. Although stem borers are notoriously difficult to rear, we have developed a reasonably successful method using cut stems, and are investigating the host specificity of the weevil in relation to adult oviposition and feeding behaviour.

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

The potential of <i>Mecysolobus erro</i> (Curculionidae) as a biological control agent for Buddleia