![]() ![]() Infection and excretion dynamics in pteropid bats (flying-foxes), the recognised natural reservoir, are incompletely understood. Hendra virus (HeV) causes highly lethal disease in horses and humans in the eastern Aus-tralian states of Queensland (QLD) and New South Wales (NSW), with multiple equine cases now reported on an annual basis. A due to competition between genotypes (Kempton and The modeling im-pact was evaluated by comparing genotype means from each trial. The objective of this study was to compare several spatial models, including or excluding heterogeneity of residual variances for cultivar evaluation in a set of independent peanut (Arachis hypogaea L.) METs. To improve the comparison of genotype means, taking into account within-trial spatial correlation as well as between-trial residual variance heterogeneity, alternative mixed models can be used. ![]() Blocking of plots within each tion from plot to plot within the same block may be trial enables one to account for between plot variation. Variaseveral replications per environment. Because of variability refers to the tendency of genotype responses, the presence of genotype � environment interaction, METs are usu- such as yield trends, to follow the spatial arrangement ally conducted in multiple environments using designs that involve of plots on the ground (Mercer and Hall, 1911). Spatial mendations about genotypes in plant breeding programs. Plots close Multienvironment Trials (MET) are used to make cultivar recom- together may be more similar than distant ones. ![]() ABSTRACT difficult to assure within block homogeneity. ![]()
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