Acta Zoológica Mexicana (2003) 89, 129-138

Jeronimo Landeros, Juan Balderas, Mohammad H. Badii, Victor M. Sanchez, Eugenio Guerrero and Adriana E. Flores (2003)
Distribución espacial y fluctuación poblacional de Phyllocoptruta oleivora (Ashmead) (Acari: Eriophyidae) en cítricos de Güemez, Tamaulipas
Acta Zoológica Mexicana 89, 129-138
Abstract: The present investigation was accomplished in the county of Güemez, Tamaulipas, Mexico during the period June of 1998 to October, of 1999. The objectives were to evaluate the spatial distribution and the population fluctuation of the citrus rust mite Phyllocoptruta oleivora (Ashmead). This investigation was conducted on 10 orange trees of the variety Valencia selected at random in an area of a hectarea. Each tree was divided into 7 sampling areas. Samples were taken every 14 days, using the leaf as the sample unit, and counting the number of mites present on both sides of the leaves. A total of 10 leaves were observed in each of 7 sections, making a total of 70 leaves for each tree and 700 for each sampling date.
Using the mean densities and the variance obtained in each sampling, a statistical analysis was conducted to determine the spatial distribution of the mite in the area study. Eight indexes were used to determine the spatial distribution. The index values of Lexis , Charlier, David and Moore, Green and the dispersion parameter (K) of negative binomial indicated a clumped distribution for this mite over all, 16 sampling dates. However the values of Morisita, Iwao, and Taylor's power law showed random distribution in two and three sampling dates, respectively. In all samples, the highest mite densities were found in the middle tree stratum (with higher aggregation toward last section of tree) followed by bottom and top strata, respectively. Population peaks were found during march 27 th and september 25 th. The dependent variable used to estimate the populate on fluctuation was the mean density of the mites in each sampling date. The independent variables were: temperature, relative humidity and precipitation. A detected positive correlation between the mean density of the mites and temperatures was observed.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Spanish)
Database assignments for author(s): Jerónimo Landeros, Adriana E. Flores, Mohammad H. Badii

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Phyllocoptruta oleivora	Citrus (genus)	Mexico