Imperial College London
Michael J Jeger

Michael J Jeger

Faculty of Natural Sciences, Department of Life Sciences (Silwood Park)

Emeritus Professor of Horticulture
 
 
 
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Contact

 

+44 (0)1398 332 941m.jeger Website

 
 
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Location

 

Home working 13 Brook Street, Bampton, Devon EX16 9LUSilwood ParkSilwood Park

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Summary

 

Publications

Citation

BibTex format

@article{Thomas-Sharma:2017:10.1094/PHYTO-09-16-0340-R,
author = {Thomas-Sharma, S and Andrade-Piedra, J and Carvajal, Yepes M and Nopsa, JFH and Jeger, MJ and Jones, RAC and Kromann, P and Legg, JP and Yuen, J and Forbes, GA and Garrett, KA},
doi = {10.1094/PHYTO-09-16-0340-R},
journal = {Phytopathology},
pages = {1123--1135},
title = {A Risk Assessment Framework for Seed Degeneration: Informing an Integrated Seed Health Strategy for Vegetatively Propagated Crops},
url = {http://dx.doi.org/10.1094/PHYTO-09-16-0340-R},
volume = {107},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Pathogen buildup in vegetative planting material, termed seeddegeneration, is a major problem in many low-income countries. Whensmallholder farmers use seed produced on-farm or acquired outsidecertified programs, it is often infected. We introduce a risk assessmentframework for seed degeneration, evaluating the relative performance ofindividual and combined components of an integrated seed health strategy.The frequency distribution of management performance outcomes wasevaluated for models incorporating biological and environmental heterogeneity,with the following results. (1) On-farm seed selection can performas well as certified seed, if the rate of success in selecting healthy plantsfor seed production is high; (2) when choosing among within-seasonmanagement strategies, external inoculum can determine the relativeusefulness of ‘incidence-altering management’ (affecting the proportionof diseased plants/seeds) and ‘rate-altering management’ (affectingthe rate of disease transmission in the field); (3) under severe diseasescenarios, where it is difficult to implement management componentsat high levels of effectiveness, combining management componentscan be synergistic and keep seed degeneration below a threshold;(4) combining management components can also close the yield gapbetween average and worst-case scenarios. We also illustrate thepotential for expert elicitation to provide parameter estimates whenempirical data are unavailable.
AU  - Thomas-Sharma,S
AU  - Andrade-Piedra,J
AU  - Carvajal,Yepes M
AU  - Nopsa,JFH
AU  - Jeger,MJ
AU  - Jones,RAC
AU  - Kromann,P
AU  - Legg,JP
AU  - Yuen,J
AU  - Forbes,GA
AU  - Garrett,KA
DO  - 10.1094/PHYTO-09-16-0340-R
EP  - 1135
PY  - 2017///
SN  - 0031-949X
SP  - 1123
TI  - A Risk Assessment Framework for Seed Degeneration: Informing an Integrated Seed Health Strategy for Vegetatively Propagated Crops
T2  - Phytopathology
UR  - http://dx.doi.org/10.1094/PHYTO-09-16-0340-R
UR  - http://hdl.handle.net/10044/1/55556
VL  - 107
ER  -
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