Assessing the threat severity of Leptocybe invasa/blue gum chalcid on Zimbabwe’s forestry industry: A case of Nyanga District, Manicaland Province.

Author
Moffat, Charmaine
Title
Assessing the threat severity of Leptocybe invasa/blue gum chalcid on Zimbabwe’s forestry industry: A case of Nyanga District, Manicaland Province.
Abstract
This study examines the threat level posed by Leptocybe invasa (Blue Gum Chalcid) to Zimbabwe's forestry sector, particularly regarding commercial Eucalyptus plantings in Nyanga, in Manicaland Province. The study sought to measure infestation levels, evaluate the effects on tree health and productivity, and determine species-specific vulnerability. A mixed-methods strategy was utilized, encompassing field sampling, structured interviews, and statistical analysis. Quantitative analysis across five planting sites revealed high gall prevalence, particularly on juvenile leaves and terminal shoots, with severity varying among Eucalyptus species. Eucalyptus grandis was the most susceptible, while hybrid clones showed moderate resistance. Qualitative evidence from forestry professionals supported the findings, highlighting stunted growth, reduced timber quality, and increased costs for pest control and replanting. These findings underscore the immediate necessity for integrated pest management (IPM) solutions customized for high-risk areas within the province. The study advocates for the adoption of resistant Eucalyptus hybrids, the enhancement of early detection techniques, and the promotion of inter-agency collaboration in pest control. This research highlights the economic and ecological consequences of L. invasa infestation, thereby enhancing the field of forest entomology and providing actionable advice to preserve the sustainability and productivity of Zimbabwe’s commercial forestry industry.
Date
June 2025
Publisher
BUSE
Keywords
Leptocybe invasa (Blue Gum Chalcid)
tree health and productivity
Supervisor
NIL
Item sets
Department of Biological Sciences
Media
Charmaine Moffat .pdf

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