Traverzo Pérez, Francisco J.

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    Biocontrol de Cylas formicarius (Coleoptera: Brentidae) utilizando nematodos entomopatógenos (Rhabditida: Steinernematidae, Heterorhabditidae) en plantaciones de batata (Ipomoea batatas ‘Pujols’)
    (2021-05-13) Traverzo Pérez, Francisco J.; Vargas Ayala, Roberto; College of Agricultural Sciences; Segarra Carmona, Alejandro E.; Macchiavelli, Raúl E.; Department of Crops and Agro-Environmental Sciences; Kolterman, Duane A.
    Worldwide economic losses in sweet potato, Ipomoea batatas (L.) Lam. crops are mainly caused by sweet potato weevil, Cylas formicarius (F.), and its damage to their storage roots. The purpose of this study was to investigate the effect of the entomopathogenic nematodes Heterorhabditis bacteriophora (P.) and Steinernema carpocapsae (W.) on C. formicarius populations and to compare their effectiveness against a commonly used insecticide. Experimental design was a completely randomized design, the treatments being H. bacteriophora (Hb), S. carpocapsae (Sc), both species applied together (BS), the insecticide endosulfan, or untreated plots on sweet potato ‘Pujols’ cultivar. When evaluating for weevil abundance, damage and root production, Sc seems to be the most effective treatment outperforming the other treatments including endosulfan, although not significantly. Hb does not appear to be as effective, and no synergy was found in BS treatment. Further studies on the effects of environmental conditions and predatory ants are recommended.
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    Hábitat estructural nocturno y fidelidad al dormidero en Anolis cristatellus y Anolis krugi
    (2008) Traverzo Pérez, Francisco J.; Lewis, Allen R.; College of Arts and Sciences - Sciences; Delannoy, Carlos A.; Bird Picó, Fernando J.; Department of Biology; Puente Rolón, Alberto R.
    How and where Anolis lizards sleep may indicate strategies used to avoid predators during nocturnal inactivity. I surveyed two sites: the first, Anolis cristatellus in simpatry with A. krugi for a total of 69 nights, and the second, A. cristatellus in an adjacent area for 22 nights. Both species sleep in leaves, with their snout directed to the stem of the leaf and in an oblique head up orientation. In simpatry they show no spatial separation with respect to height. The lizards usually return to sleep within 2 m from the initial point. A. cristatellus showed a higher fidelity to a same leaf and within a 2 m area. A. krugi utilized their sleep-sites for short periods of time. I conclude that the flexibility of leaves can alert the lizards and allow them to escape faster through the branches when the snout is directed toward the stem of the leaf. The frequent returns to the same leaf or a same area indicate a high degree sleeping-site fidelity.