A potential model for pea footrot disease prediction

Etebu, E and Osborn, A 2011, 'A potential model for pea footrot disease prediction', Asian Journal of Agricultural Sciences, vol. 3, no. 3, pp. 177-186.


Document type: Journal Article
Collection: Journal Articles

Title A potential model for pea footrot disease prediction
Author(s) Etebu, E
Osborn, A
Year 2011
Journal name Asian Journal of Agricultural Sciences
Volume number 3
Issue number 3
Start page 177
End page 186
Total pages 10
Publisher Maxwell Science Publications
Abstract Footrot disease due to Nectria haematococca (anamorph Fusarium solani f.sp pisi) is a globally, economically important disease of peas. Although the principle of inter-relationship between soil factors,inoculum density and disease potential in disease incidence, development and severity is recognised, and molecular techniques targeting a pea pathogenicity gene (PEP3) have recently been developed to accurately estimate the inoculum load of pathogenic forms of N. haematococca in soil, works incorporating soil parameters in a predictive model is yet unknown. Hence, in this research, some biotic and abiotic soil properties were assessed and the factors that influence the interaction between pathogenic N. haematococca and peas, culminating to footrot disease were studied. Pearson correlation results showed that pea footrot disease severity arising from the interaction between pathogenic N. haematococca and pea was largely dependent on the abiotic component of soil. Pea footrot disease was significantly (p = 0.05) related to soil pH (r2 = 0.52), total oxidised nitrogen (r2 = 0.41), C/N ratio (r2 = -0.39), phosphate concentration (r2 = 0.56) and potassium (r2 = 0.31). Principal component analysis results showed that footrot disease, pea pathogenicity gene (PEP3), fungal richness, phosphate, potassium and magnesium were positively inter-related. A predictive disease model [DI = 1.97 + (3.48×Phosphate) + (-0.66×C/N)] (R2 = 0.42) identified phosphate and C/N ratio as abiotic factors that determine footrot disease severity of peas in soil.
Keyword(s) Footrot disease
peas
Fusarium solani
Nectria haematococca
pea pathogenicity gene (PEP3)
soil DNA
soil physico-chemical properties
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