ORIGINAL ARTICLE
Intercropping and diverse field margin vegetation suppress bean aphid (Homoptera: Aphididae) infestation in dolichos (Lablab purpureus L.)
1
Crops, Horticulture and Soils, Egerton University, Kenya
2
Biological Sciences, Egerton University, Kenya
3
Jodrell Laboratory, Royal Botanic Gardens Kew, Richmond, UK
4
Nelson Mandela African Institute of Science and Technology, Arusha, Tanzania
A - Research concept and design; B - Collection and/or assembly of data; C - Data analysis and interpretation; D - Writing the article; E - Critical revision of the article; F - Final approval of article
Submission date: 2021-05-29
Acceptance date: 2021-07-22
Online publication date: 2021-10-06
Journal of Plant Protection Research 2021;61(3):290-301
KEYWORDS
TOPICS
ABSTRACT
Dolichos (Lablab purpureus L.) is a drought tolerant legume used as food/feed and im-
provement of soil fertility. The production of dolichos in Kenya, Nakuru County is
however limited by insect pests like bean aphids, pod borers and whiteflies. Field stud-
ies were conducted to determine the effect of cropping systems (dolichos monocrop and
maize-dolichos intercrop) and field margin vegetation on bean aphids and their natural
enemies. The experiment was conducted in Njoro (high field margin vegetation) and Ron-
gai (low field margin vegetation) during May–December 2019 and March−November 2020
cropping seasons. Bean aphid percent incidence, severity of damage and abundance was
assessed at seedling, early vegetative, late vegetative and flowering dolichos growth stages.
The populations of natural enemies in the plots and field margin vegetation were monitored
using pan traps and sweep nets. Species diversity and composition of the field margin ve-getation was determined using a quadrat. Results showed that location and cropping system
had significant effects on bean aphid infestations. A high bean aphid incidence (38.13%)
was observed in Njoro compared to Rongai (31.10%). Dolichos monocrop had significantly
higher bean aphid infestation (51.63%) than the maize-dolichos intercrop system (24.62%).
A highly diverse Shannon-weaver index was observed in Rongai (1.90) compared to Njoro
(1.67). Dolichos monocrop had a more diverse Shannon-weaver index (1.8) than the maize-
dolichos intercrop system (1.7). Rongai had the most abundant annual and perennial field
margin vegetation species. The field margin species richness and diversity were higher
in Rongai (81%) than in Njoro (54%). The findings of this study have demonstrated that
a maize-dolichos intercrop in Rongai can reduce bean aphid damage in dolichos.
ACKNOWLEDGEMENTS
his work was made
possible through collaboration of farmers in Rongai
and Njoro sub-counties of Nakuru County, Kenya. The
institutional support offered by Egerton University is
appreciated.
FUNDING
This research was funded by the Natural Pest Re-
gulation on Orphan Crop Legumes in Africa
(NaPROCLA) project under the Biotechnology and
Biological Sciences Research Council (BBSRC) agre-
ement number BB/R020361/1.
RESPONSIBLE EDITOR
Vahid Mahdavi
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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