Landscape factors and how they influence whitefly pests in cassava fields across East Africa
- PDF / 1,583,462 Bytes
- 23 Pages / 547.087 x 737.008 pts Page_size
- 34 Downloads / 261 Views
(0123456789().,-volV) ( 01234567 89().,-volV)
RESEARCH ARTICLE
Landscape factors and how they influence whitefly pests in cassava fields across East Africa Sarina Macfadyen . Wee Tek Tay . Andrew D. Hulthen . Cate Paull . Andrew Kalyebi . Frances Jacomb . Hazel Parry . Peter Sseruwagi . Zuberi Seguni . Christopher Abu Omongo . Donald Kachigamba . Michael Otim . Nancy Schellhorn . Andrew Polaszek . John Colvin . Paul De Barro Received: 14 October 2019 / Accepted: 18 August 2020 Ó The Author(s) 2020
Abstract Context African production landscapes are diverse, with multiple cassava cultivars grown in small patches amongst a diversity of other crops. Studies on how diverse smallholder landscapes impact herbivore pest outbreak risk have not been carried out in sub-Saharan Africa. Objectives Bemisia tabaci is a cryptic pest species complex that cause damage to cassava through feeding and vectoring plant-virus diseases and are known to Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10980-020-01099-1) contains supplementary material, which is available to authorized users. S. Macfadyen (&) W. T. Tay F. Jacomb CSIRO, GPO Box 1700, Canberra, ACT 2601, Australia e-mail: [email protected] A. D. Hulthen C. Paull H. Parry N. Schellhorn P. De Barro CSIRO, Brisbane, QLD 4001, Australia A. Kalyebi C. A. Omongo M. Otim National Crops Resources Research Institute, Kampala, Uganda
reach very high densities in certain contexts. However, the factors driving this phenomenon are unclear. Methods Bemisia density data in cassava across a large number of sites representing a geographic gradient across Uganda, Tanzania and Malawi were collected. We tested whether in-field or landscape factors associated with land-use patterns underpinned Bemisia density variability and parasitism. Results We found the B. tabaci SSA1 species dominated our study sites, although other species were also common in some cassava fields. Factors associated with the surrounding landscape were unimportant for explaining variability in adult density, but the in-field variables of cassava age and cultivar N. Schellhorn RapidAIM Pty Ltd, Brisbane, QLD 4101, Australia A. Polaszek Department of Life Sciences, Natural History Museum, London, UK J. Colvin Natural Resources Institute, University of Greenwich, Chatham Maritime, Kent, UK
A. Kalyebi P. Sseruwagi Z. Seguni Mikocheni Agricultural Research Institute, Dar es Salaam, Tanzania D. Kachigamba Department of Agricultural Research Services, Bvumbwe Research Station, Limbe, Malawi
123
Landscape Ecol
were very important. The density of nymphs and the parasitism of nymphs was heavily influenced by a diversity of landscape factors surrounding the field, including the size of focal cassava field, and area of cassava in the landscape. However, unlike the trend from many other studies on drivers of natural enemy populations, this pattern was not solely related to the amount of non-crop vegetation, or the diversity of crops grown in the landscape. C
Data Loading...
