Abstract
The aim of this study was to carry out probabilistic analyses of the spatial distribution patterns of adults of Triozoida limbata Enderlein, 1918 (Hemiptera: Triozidae) in guava orchards. This study was conducted in four guava orchards in Ivinhema, Mato Grosso do Sul, Brazil. The samplings were conducted every fortnight from April 2012 to March 2014. A sampling area was set up for adult samples, and it consisted of 24 sampling units or plots with 15 plants in each (3 rows × 5 plants). A double-sided adhesive yellow trap was installed, 23 cm in length and 11 cm in width, around the central plant of each sampling unit, approximately 1.5 m from the ground. The dispersion rates (variance/mean ratio, Morisita index and Exponent k of the Negative Binomial Distribution) and the theoretical frequency distributions (Poisson and Negative Binomial) were calculated. Following the analyses, it can be concluded that the adults of T. limbata of the populations studied are randomly distributed in the four areas evaluated, with the sampling data fitting the Poisson distribution model.
Highlights
During its development, guava is attacked by various pest insects that cause different types of damage (Sá, 2011)
Knowledge of the spatial distribution of nymphs of T. limbata is essential for improving sampling and control techniques
We concluded that nymphs of T. limbata in the studied populations were randomly organized in the four areas that were evaluated, and the sampling data have been adjusted to the Poisson distribution model
Summary
Guava is attacked by various pest insects that cause different types of damage (Sá, 2011). These insects represent the main obstacles to cultivate guava because they reduce the yield and quality of fruits (Yana et al, 2010; Ndankeu et al, 2011). Adults of T. limbata have transparent wings without stigmata, displaying radial wing nervures, and the middle and first cubital nervures emerge from a single point. They are greenish in color and measure around 2.0 mm to 2.4 mm in length (Taylor et al, 2010). We found that 19 to 92 eggs were laid per female with an egg incubation period of 7 days to 9 days and a nymphal stage between 29 days and 35 days
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
