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Insect pest damage increases faba bean (Vicia faba) yield components but only in the absence of insect pollination

Riggi, Laura and Raderschall, Chloë and Lundin, Ola (2022). Insect pest damage increases faba bean (Vicia faba) yield components but only in the absence of insect pollination. Ecology and Evolution. 12 :3 , e8686
[Research article]

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Abstract

Identifying and quantifying crop stressors interactions in agroecosystems is necessary to guide sustainable crop management strategies. Over the last 50 years, faba bean cropping area has been declining, partly due to yield instabilities associated with uneven insect pollination and herbivory. Yet, the effect of interactions between pollinators and a key pest, the broad bean beetle Bruchus rufimanus (florivorous and seed predating herbivore) on faba bean yield has not been investigated. Using a factorial cage experiment in the field, we investigated how interactions between two hypothesized stressors, lack of insect pollination by bumblebees and herbivory by the broad bean beetle, affect faba bean yield. Lack of bumblebee pollination reduced bean weight per plant by 15%. Effects of the broad bean beetle differed between the individual plant and the plant-stand level (i.e., when averaging individual plant level responses at the cage level), likely due to high variation in the level of herbivory among individual plants. At the individual plant level, herbivory increased several yield components but only in the absence of pollinators, possibly due to plant overcompensation and/or pollination by the broad bean beetle. At the plant-stand level, we found no effect of the broad bean beetle on yield. However, there was a tendency for heavier individual bean weight with bumblebee pollination, but only in the absence of broad bean beetle herbivory, possibly due to a negative effect of the broad bean beetle on the proportion of legitimate flower visits by bumblebees. This is the first experimental evidence of interactive effects between bumblebees and the broad bean beetle on faba bean yield. Our preliminary findings of negative and indirect associations between the broad bean beetle and individual bean weight call for a better acknowledgment of these interactions in the field in order to understand drivers of crop yield variability in faba bean.

Authors/Creators:Riggi, Laura and Raderschall, Chloë and Lundin, Ola
Title:Insect pest damage increases faba bean (Vicia faba) yield components but only in the absence of insect pollination
Series Name/Journal:Ecology and Evolution
Year of publishing :2022
Volume:12
Number:3
Article number:e8686
Number of Pages:14
ISSN:2045-7758
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:broad bean beetle, compensatory growth, ecosystem services, florivory, non-additive effects, resource allocation
URN:NBN:urn:nbn:se:slu:epsilon-p-116381
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-116381
Additional ID:
Type of IDID
DOI10.1002/ece3.8686
ID Code:27330
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
Deposited By: SLUpub Connector
Deposited On:17 Mar 2022 13:25
Metadata Last Modified:17 Mar 2022 13:31

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