Three views of the annual phase map of the domestic cat,<i>Felis catus</i>L.

Randall, Walter; Parsons, Virginia

doi:10.1080/09291018709359928

Cited by 4 publications

(1 citation statement)

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“…It may be that this approach only appears to be suitable for studying diseases of perennial crops. However, this analysis has been applied to studying seasonal biological rhythms in animals (Jackson & Williams, 1973; Randall & Parsons, 1987; Ruiz & Lyle, 1992) and it has been suggested as a useful analysis for long‐term agricultural experiments (Roberts, 1980). Indeed, the application of regression analysis in the rose apple rust pathosystem, as proposed in this paper, allowed the use of the entire annual disease progress curve for correlation with weather variables.…”

Section: Discussionmentioning

confidence: 99%

Epidemiology of a Neotropical rust (Puccinia psidii): periodical analysis of the temporal progress in a perennial host (Syzygium jambos)

Tessmann

Dianese²,

Miranda

et al. 2001

Plant Pathology

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The epidemiology of the Neotropical rust caused by Puccinia psidii in the Indian Myrtaceae Syzygium jambos (rose apple) was investigated in central Brazil. Disease severities recorded during a 12-month period were fitted by a Fourier curve with three cyclic components or harmonics. The first, second and third harmonics accounted for 49´6, 25´9, and 1´5% of total disease measured, respectively. A highly significant linear correlation was observed between the first harmonic and the accumulated number of days having at least 6 h wetness, or a minimum of 90% relative humidity, combined with temperatures that ranged from 18 to 208C. No significant correlation was observed between the second and third harmonics and the weather variables evaluated. Rose apple trees showed a flush of growth with new susceptible host tissue during the evaluation period, with two major outbreaks of rust of variable intensity. Host growth was fitted by a Fourier curve with two significant harmonics. The first and second harmonics accounted for 37´5 and 22´1% of total host growth measured, respectively. A highly significant negative linear correlation was observed between the first harmonic and daily maximum and minimum temperatures, rainfall, and duration of the light period. Inoculum availability was not a limiting factor for disease progress since urediniospores were present during most of the period studied. A major peak in numbers of rust spores followed the main peak of disease severity. Thus, rust epidemics on rose apple in central Brazil were shown to depend on the duration of leaf wetness in the dark, and also on night-time temperatures during that same wetness period. This study is the first example of a periodical analysis of an epidemic in a perennial crop.

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Section: Discussionmentioning

confidence: 99%