Abstract

BANOS DIAZ, Heyker L. et al. Population parameters of Diaphorina citri Kuwayama (Hemiptera: Liviidae) and Tamarixia radiata Waterston (Hymenoptera: Eulophidae) under natural conditions. Rev. Protección Veg. [online]. 2015, vol.30, n.1, pp. 30-39. ISSN 2224-4697.

The population fluctuation of Diaphorina citri Kuwayama and its parasitoid Tamarixia radiata Waterston was determined in urban areas of the municipality of Playa, Havana City, Cuba. The study was carried out from February 15, 2007, to April 15, 2009. The populations of both insects on plants of Murraya paniculata L. (Jack) and Citrus spp. growing in private and public gardens were evaluated every ten days. In order to understand the interactions between the target pest and its parasitoid, logistic regressions,working with a nonlinear model, were used, and the generalized relationship between the samplings were used to determine the density in which a control treatment was necessary. The population of both insects on M. paniculata plants was higher in 2009; in the case of the natural enemy, the population doubled that observed in 2007. The lowest percentages of parasitoidism were found in the citrus plants. The maximum increase rate (K) of D. citri was 147, which exceeded the rate found during the samplings, with a mean population (ì) of 110.9 individuals and a net instantaneous growth rd = 0.06 ; for the parasitoid (K) was 98.25 individuals, a value higher than that observed for the samples, with a population mean (ì) of 53.4 individuals. With these results, it was estimated that, when a total of 49 individuals was present per each five sampled buds, it would be necessary the application of some measure to avoid the quick increment of D. citri.

Keywords : Diaphorina citri; Tamarixia radiata; populational fluctuation; logistic regressions; maximum increase rate; instantaneous growth net.

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