Submitted to: Brazilian National Congress of Entomology
Publication Type: Abstract Only
Publication Acceptance Date: 6/18/2012
Publication Date: 9/16/2012
Citation: Tomaseto, A.F., Krugner, R., Lopes, J.R. 2012. Recapture rate of diaphorina citri kuwayama (hemiptera: psyllidae) marked with fluorescent dust in dispersal studies. Brazilian National Congress of Entomology. Available:www.seb.org.br/cbe2012/trabalhos/1875/1875_1.pdf Interpretive Summary:
Technical Abstract: Knowledge on the dispersal capacity of the insect vector Diaphorina citri Kuwayama is necessary to answer questions related to Huanglongbing epidemiology and improve current management strategies for the disease. The objectives of this field study were to determine the recapture rate and distance of adult D. citri released after being marked with fluorescent dust markers and determine whether the technique could be used in future studies on D. citri dispersal and movement. Marked individuals were released twice in four circular experimental areas containing sweet orange trees [Citrus sinensis (L.) Osbeck] planted in concentric circles at 18, 24, and 30 m from the point of release. In each circle, the spacing between plants was 3 m. During two days after the releases, the numbers of insects recapture at each distance was monitored using yellow sticky traps placed 6 m apart. The experiment was established as a completely randomized block design using release dates and distances as main factors. Mean recapture rates were 1.9, 1.0, and 0.9% at 18, 24, and 30 m from the point of release, with a total of 4.5% recapture rate. A higher number (P < 0.05) of individuals were recaptured at 18 m than the other distances evaluated and there were no significant increases in the percentage of trapped individuals between the two days of the study, which suggests that D. citri move rapidly towards host plants but there is little movement between plants after they establish on a suitable host. Therefore, studies aimed at investigating dispersal and movement behaviors of D. citri using fluorescent dust markers under the conditions described here should expect a 4.5% recapture rate and an insect aggregation on host plants located closer to the point of release.