期刊
BIOCONTROL SCIENCE AND TECHNOLOGY
卷 32, 期 6, 页码 685-699出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09583157.2022.2045002
关键词
Biocontrol agent; insecticidal exclusion; invasive alien plants; seedling density; seed-rain; soil seedbank
资金
- Natural Resources Management (NRM) Programme of the Department of Forestry, Fisheries and the Environment
The study measured the combined impact of biocontrol agents on the seed regenerative capacity of Lantana camara in South Africa, finding that the current suite of biocontrol agents had minimal impact on the recruitment potential of the plant, indicating a need for better adapted agents for the environmental conditions in the area.
The combined impact of biocontrol agents on the seed regenerative capacity, i.e. seed production, seed-rain, soil seedbank, seed germination and seedling density, of Lantana camara L. (sensu lato) (Verbenaceae), was measured in the field in an inland area of South Africa. The study was conducted on 10 plots (20 x 50 m each) along part of the Sabie River catchment. The most prevalent biocontrol agents at the site were Aceria lantanae (Cook) (Acari: Trombidiformes: Eriophyidae), Hypena laceratalis Walker (Lepidoptera: Noctuidae), Octotoma scabripennis Guerin-Meneville (Coleoptera: Chrysomelidae), Ophiomyia camarae Spencer (Diptera: Agromyzidae) and Teleonemia scrupulosa Stal (Hemiptera: Tingidae). Using the insecticidal exclusion method, comparisons of seed regenerative capacity were made between exclusion (insecticide treated) and biocontrol (untreated) plants over a three-year period. Lantana camara seed production per plant was slightly lower in biocontrol (5831 +/- 844 seeds) compared to exclusion plants (6718 +/- 1571 seeds), seed-rain density was significantly lower in biocontrol (1080 +/- 122 seeds m(-2)) compared to exclusion plants (1419 +/- 154 seeds m(-2)). Seed germination was lower in biocontrol (98 +/- 41 seeds m(-2)) compared to exclusion plants (116 +/- 38 seeds m(-2)). Seedling density was higher in biocontrol (36 +/- 14 seedlings m(-2)) compared to exclusion plants (32 +/- 11 seedlings m(-2)). Adult plants appeared to suppress their own seedlings. This study showed that the impact of the current suite of biocontrol agents on the recruitment potential of L. camara is minimal, emphasising the need for additional agents, better adapted to the cooler high altitude inland environmental conditions.
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