Abstract
Daily multiplication factor (number of daughter lesions per mother lesion per day) values were experimentally measured in four replications of a monocyclic experiment on angular leaf spot (ALS) of bean, where sources of inoculum were artificially established within a bean canopy, on the ground (defoliated infected leaves), or both. Daily multiplication factor of lesions in the canopy (DMFRc) was higher than that of infectious, defoliated tissues (DMFRd) in all replications. Both DMFRc and DMFRd were strongly reduced under dry compared to rainy conditions. Under rainy conditions for spore dispersal DMFRd was about two to three times smaller than DMFRc. Defoliated leaves may nevertheless represent a significant source of infection, depending on the amount of infectious tissues. Mother lesions within the canopy generated more daughter lesions in the medium (or lower) layers of the canopy than at its upper level (DMFRc higher at the medium and lower layers of a canopy), whereas DMFRd values seemed to decrease with height in the canopy. A mechanistic simulation model that combines host growth and disease-induced defoliation was designed to simulate the respective contributions of the two components of the dual inoculum source of a diseased canopy (infected foliage and defoliated infectious tissues), and varying infectious periods in both sources. Simulations suggest that higher DMFRc values have a large polycyclic effect on epidemics whereas that of DMFRd is small, and that large effects of the infectious period of lesions in the canopy are found when DMFRc is high. Simulations using experimentally measured DMFRc and DMFRd values indicated much stronger epidemics in rainy compared to dry conditions for spore dispersal, but disease persistence in the latter. The implications of considering a dual source of inoculum in the course of a polycyclic process are discussed with respect to epidemic thresholds.
Similar content being viewed by others

Explore related subjects
Discover the latest articles and news from researchers in related subjects, suggested using machine learning.References
DJ Allen RA Buruchara JB Smithson (1998) Diseases of common bean DJ Allen JM Lenné (Eds) The Pathology of Food and Pasture Legumes Wallingford CABI, UK 179–265
Allorent D and Savary S (200-) A systems analysis of the epidemiological characteristics of angular leaf spot of bean. European Journal of Plant Pathology (in press).
RM Anderson RM May (1979) ArticleTitlePopulation biology of infectious diseases – part 1 Nature 280 361–367 Occurrence Handle1:STN:280:CSaB387ovF0%3D Occurrence Handle460412
AB Bergamin Filho SMTPG Carneiro CV Godoy L Amorim RD Berger B Hau (1997) ArticleTitleAngular leaf spot of Phaseolus beans: relationships between disease, healthy leaf area, and yield Phytopathology 87 506–515
RA Buruchara EM Gathuru DM Mukunya (1988) ArticleTitleDisease progress of angular leaf spot caused by Isariopsis griseola Sacc. and its implications on resistance of some bean (Phaseolus vulgaris L.) cultivars Acta Horticulturae 218 321–328
CL Campbell LV Madden (1990) Introduction to Plant Disease Epidemiology John Wiley & Sons New York
SMTPG Carneiro L Amorim A Bergamin Filho (1997) ArticleTitleAngular leaf spot damage assessment on beans: relationship between disease severity, leaf area, and yield components Fitopatologia Brasileira 22 427–431
SMTPG Carneiro L Amorim A Bergamin Filho B Hau A Bianchini (2000) ArticleTitleLeaf area dynamic, defoliation, and healthy leaf area variables on common beans with single and multiple infections of Phaeoisariopsis griseola and Colletotrichum lindemuthianum Summa Phytopathologica 26 406–412
JA Duthie CL Campbell (1991) ArticleTitleEffects of plant debris on intensity of leaf spot diseases, incidence of pathogens, and growth of alfalfa Phytopathology 81 511–517
KA Garrett LV Madden G Hughes WF Pfender (2004) ArticleTitleNew applications of statistical tools in plant pathology Phytopathology 94 999–1003
CA Gilligan (2002) ArticleTitleAn epidemiological framework for disease management Advances in Botanical Research 38 1–64
CV Godoy SMTPG Carneiro MT Iamauti MD Pria L Amorim RD Berger AB Filho (1997) ArticleTitleDiagrammatic scales for bean diseases: development and validation Zeitschrift fur Pflanzenkrankheiten und Pflanzenschutz 104 336–345
S Gubbins CA Gilligan A Kleczkowski (2000) ArticleTitlePopulation dynamics of plant-parasite interactions: thresholds for invasion Theoretical Population Biology 57 219–233 Occurrence Handle10.1006/tpbi.1999.1441 Occurrence Handle1:STN:280:DC%2BD3c3ptFelsA%3D%3D Occurrence Handle10828215
High Performance Systems (1996) Stella II version 4.0 Technical Documentation. Loose-leafed. Hanover, NH, USA
MJ Jeger (1986) ArticleTitleAsymptotic behaviour and threshold criteria in model plant disease epidemics Plant Pathology 35 355–361
WC Jesus Junior Particlede FXR Vale RR Coelho B Hau L Zambolim LC Costa A Bergamin Filho (2001) ArticleTitleEffects of angular leaf spot and rust on yield loss of Phaseolus vulgaris Phytopathology 91 1045–1053
WC Jesus Junior Particlede FXR Vale RR Coelho PA Paul B Hau A Bergamin Filho L Zambolim RD Berger (2003) ArticleTitleRelationships between angular leaf spot, healthy leaf area, effective leaf area and yield of Phaseolus vulgaris European Journal of Plant Pathology 109 625–632 Occurrence Handle10.1023/A:1024787231063
KB Johnson (1987) ArticleTitleDefoliation, disease, and growth: a reply Phytopathology 77 1495–1497
AC Kushalappa A Ludwig (1982) ArticleTitleCalculation of apparent infection rate in plant diseases: development of a method to correct for host growth Phytopathology 72 1373–1377
C Lannou C Vallavieille-Pope Particlede H Goyeau (1994) ArticleTitleHost mixture efficacy in disease control: effects of lesion growth analyzed through computer-simulated epidemics Plant Pathology 43 651–662
JH Lieth JF Reynolds (1988) ArticleTitleA plant growth model for controlled-environment conditions incorporating canopy structure and development: application to snap bean Photosynthetica 22 190–204
B Mora M Pastor Corrales L Zambolim C Viera G Chaves (1985) ArticleTitleDetermining yield losses in French bean from angular leaf spot (Isariopsis griseola Sacc) Phytopathology 75 1178–1178
CC Mundt KJ Leonard WM Thal JH Fulton (1986) ArticleTitleComputerized simulation of crown rust epidemics in mixtures of immune and susceptible oat plants with different genotype unit areas and spatial distributions of initial disease Phytopathology 76 590–598
CC Mundt LS Brophy (1988) ArticleTitleInfluence of number of host genotype units on the effectiveness of host mixtures for disease control: a modeling approach Phytopathology 78 1087–1094
SC Nelson CL Campbell (1991) ArticleTitleEffects of host growth and defoliation on progress of leaf spot epidemics on white clover (Abstr.) Phytopathology 81 813
SC Nelson CL Campbell (1993) ArticleTitleDisease progress, defoliation, and spatial pattern in a multiple-pathogen disease complex on white clover Phytopathology 83 419–429
JL Plaut RD Berger (1980) ArticleTitleDevelopment of Cercosporidium personatum in three peanut (Arachis hypogaea cultivar Florunner) canopy layers Peanut Science 7 46–49
AW Saettler (1991) Angular leaf spot R Hall (Eds) Compendium of Bean Diseases APS Press St Paul, MN 15–16
A Sartorato (2004) ArticleTitlePathogenic variability and genetic diversity of Phaeoisariopsis griseola isolates from two counties in the state of Goias, Brazil Journal of Phytopathology 152 385–390 Occurrence Handle10.1111/j.1439-0434.2004.00858.x
Savary S and Servat E (1991) Un modèle simplifié de simulation des épidémies de rouille et de cercosporioses de l’arachide. In: ORSTOM et Karthala (ed) Approches de la Pathologie des Cultures Tropicales (pp 129–155), Paris.
S Savary PD Jong Particlede R Rabbinge JC Zadoks (1990) ArticleTitleDynamic simulation of groundnut rust, a preliminary model Agricultural Systems 32 113–141 Occurrence Handle10.1016/0308-521X(90)90034-N
S Savary JL Janeau D Allorent M Escalante J Avelino L Willocquet (2004) ArticleTitleEffects of simulated rainfall events on spore dispersal and spore stocks in three tropical pathosystems Phytopathology 94 S92
MB Silva FXR Vale L Zambolim B Hau (1998) ArticleTitleEffects of bean rust, anthracnosis and angular leaf spot on dry bean leaf area Fitopatologia Brasileira 23 442–447
P Sun S Zeng (1994) ArticleTitleOn the measurement of the corrected basic infection rate Journal of Plant Diseases and Protection 101 297–302 Occurrence Handle1:CAS:528:DyaK2MXhtlaks7o%3D
PS Teng (1981) ArticleTitleValidation of computer models of plant disease epidemics: a review of philosophy and methodology Journal of Plant Diseases and Protection 88 49–63
WM Thal CL Campbell (1988) ArticleTitleAnalysis of progress of alfalfa leaf spot epidemics Phytopathology 78 389–395
JE Plank ParticleVan der (1963) Plant Diseases- Epidemics and Control Academic Press New York
JE Plank ParticleVan der (1965) ArticleTitleDynamics of epidemics in plant disease Science 147 120–124
PE Waggoner RD Berger (1987) ArticleTitleDefoliation, disease, and growth Phytopathology 77 393–398
L Willocquet D Allorent S Savary (2004) ArticleTitleQuantitative analysis of two important epidemiological features in the common bean – Phaeoisariopsis griseola pathosystem Fitopatologia Brasileira 29 676–679
JC Zadoks (1971) ArticleTitleSystems analysis and the dynamics of epidemics Phytopathology 61 600–610
JC Zadoks P Kampmeijer (1977) ArticleTitleThe role of crop populations and their deployment, illustrated by means of a simulator, EPIMUL 76 Annals of the New York Academy of Sciences 287 164–190
JC Zadoks RD Schein (1979) Epidemiology and plant disease management Oxford University Press Inc New York
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Allorent, D., Willocquet, L., Sartorato, A. et al. Quantifying and Modelling the Mobilisation of Inoculum from Diseased Leaves and Infected Defoliated Tissues in Epidemics of Angular Leaf Spot of Bean. Eur J Plant Pathol 113, 377–394 (2005). https://doi.org/10.1007/s10658-005-4269-y
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s10658-005-4269-y

