Field Margin Vegetation in Tropical African Bean Systems Harbours Diverse Natural Enemies for Biological Pest Control in Adjacent Crops

被引：25

作者：

Mkenda, Prisila A. ^{[1
,2
]}

Ndakidemi, Patrick A. ^{[1
]}

Stevenson, Philip C. ^{[3
,4
]}

Arnold, Sarah E. J. ^{[3
]}

Belmain, Steven R. ^{[3
]}

Chidege, Maneno ^{[5
]}

Gurr, Geoff M. ^{[6
,7
]}

机构：

[1] Nelson Mandela African Inst Sci & Technol, Dept Sustainable Agr Biodivers & Ecosyst Manageme, POB 447, Arusha 23311, Tanzania

[2] Sokoine Univ Agr, Dept Biosci, POB 3000, Morogoro 67129, Tanzania

[3] Univ Greenwich, Nat Resources Inst, Chatham ME4 4TB, Kent, England

[4] Royal Bot Gardens, Richmond TW9 3AB, Surrey, England

[5] TPRI, Dept Res, Div Plant Protect, POB 3024, Arusha 23201, Tanzania

[6] Charles Sturt Univ, Graham Ctr Agr Innovat, POB 883, Orange, NSW 2800, Australia

[7] Fujian Agr & Forestry Univ, Inst Appl Ecol, Fuzhou 350002, Fujian, Peoples R China

来源：

SUSTAINABILITY | 2019年 / 11卷 / 22期

基金：

英国生物技术与生命科学研究理事会;

关键词：

ecosystem service; pest regulation; predators; parasitoids; non-crop vegetation; LANDSCAPE COMPOSITION; NONCROP VEGETATION; DROSOPHILA-SUZUKII; POPULATION-DYNAMICS; HOST PLANTS; PROMOTE; BIODIVERSITY; COMMUNITIES; MANAGEMENT; SPIDER;

D O I：

10.3390/su11226399

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Non-crop vegetation around farmland can be valuable habitats for enhancing ecosystem services but little is known of the importance of field margins in supporting natural enemies of insect pests in tropical agriculture. This study was conducted in smallholder bean fields in three elevation zones to assess the importance of field margin vegetation to natural enemy populations and movement to the bean crop for biological pest control. The pests and natural enemies were assessed using different coloured water pan traps (to ensure the capture of insects with different colour preferences) and the interactions of the two arthropod groups with the margin vegetation and their movement to the bean crop were monitored using fluorescent dye. Sentinel plants were used to assess predation and parasitism levels. A total of 5003 natural enemies were captured, more in the field margin than within the bean field for low and mid elevation zones, while in the high elevation zone, they were more abundant within the bean field. Pests were more abundant in the crop than margins for all the elevation zones. The use of a dye applied to margin vegetation demonstrated that common natural enemy taxa moved to the crop during the days after dye application. The proportion of dye-marked natural enemies (showing their origin to be margin vegetation) sampled from the crop suggest high levels of spatial flux in the arthropod assemblage. Aphid mortality rates (measured by prey removal and parasitism levels on sentinel plants) did not differ between the field edges and field centre in any of the three elevation zones, suggesting that for this pest taxon, the centre of the fields still receive comparable pest control service as in the field edges. This study found that field margins around smallholder bean fields are useful habitats to large numbers of natural enemy taxa that move to adjacent crops providing biological pest control service.

引用

页数：19

共 60 条

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