Abstract
The psyllid Diaphorina citri Kuwayama is one of the most important pests of citrus, mainly because it is the vector of the bacterium that causes huanglongbing (HLB) or 'Greening' disease. To study the spatial distribution of nymphs and adults of this pest, an experiment was carried out in two 'Valencia' sweet orange orchards, four and 12 years of age, established in Matão, central area of São Paulo state, Brazil. The following dispersion indices were used to study pest aggregation in the citrus plants: variance/mean relationship (I), index of Morisita (Iδ), coefficient of Green (Cx), the <img border=0 width=16 height=16 src="../../../../../img/revistas/sa/v67n5/a08form10.gif" align=absmiddle>exponent of negative binomial distribution, common k (<img border=0 width=16 height=16 src="../../../../../img/revistas/sa/v67n5/a08form10.gif" align=absmiddle>c) and Taylor's Power Law for each sampling. The negative binomial distribution was more representative of the spatial distribution of this psyllid, for both nymphs and adults. For most samplings, psyllid nymphs found in branches and adults caught in traps had an aggregated distribution.
Subject
Agronomy and Crop Science,Animal Science and Zoology
Reference27 articles.
1. The statistical analysis of insect counts based on the negative binomial distributions;Anscombe F.J.;Biometrics
2. Probabilistic models for distributions of Spodoptera frugiperda (J. E. Smith, 1797), in maize;Barbosa J.C.;Científica
3. Fitting the negative binomial to biological data, note on the efficient fitting of the negative binomial;Bliss C.I.;Biometrics
4. Negative binomial distributions with a common k;Bliss C.I.;Biometrika
5. Diaphorina citri Kuway., a vector of the greening disease of citrus in India;Capoor S.P.;Indian Journal of Agricultural Science
Cited by
34 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献