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Spatial pattern analysis of the incidence of aster yellows disease in lettuce
Author(s) -
Madden L. V.,
Nault L. R.,
Murral D. J.,
Apelt M. R.
Publication year - 1995
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/bf02515830
Subject(s) - quadrat , biology , leafhopper , spatial distribution , advanced spaceborne thermal emission and reflection radiometer , veterinary medicine , aster yellows , statistics , botany , ecology , horticulture , mathematics , transect , geography , hemiptera , genotype , restriction fragment length polymorphism , genetics , medicine , remote sensing , digital elevation model , gene
The degree of aggregation of lettuce plants infected by aster yellows phytoplasma (AYP) was investigated in 12 fields from three experiments. Position of diseased and healthy plants was mapped in a 6–9×12‐m section of each field; for most analyses, fields were divided into 10‐plant quadrats. Mean disease incidence ( p ) ranged from 0.01 to 0.30. The frequency of diseased plants was described by the beta‐binomial distribution, with an index of aggregation (θ) ranging from 0 to 0.17, positively correlated with p , and generally increasing over time within a field. Distance‐class analysis revealed a core‐cluster size of only a few plants. However, spatial autocorrelations of p between quadrats were not significant, indicating that the scale of spatial pattern was small, generally less than 10 plants. An overall measure of aggregation was given by the slope parameter of the binary form of the power law, in which the log of the calculated variance is regressed on the log of the theoretical variance for a binomial distribution. The slope was 1.18 and significantly different from 1. Results for this “simple‐interest” disease are interpreted in relation to the persistent transmission of AYP by its aster leafhopper vector.