Ronaldo Reis Junior | UNIMONTES universidade estadual de Montes Claros (original) (raw)

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Papers by Ronaldo Reis Junior

Development of a Model to Predict the Occurrence of Citrus Fruit Borer, Ecdytolopha aurantiana (L... more Development of a Model to Predict the Occurrence of Citrus Fruit Borer, Ecdytolopha aurantiana (Lima) (Lepidoptera: Tortricidae) ABSTRACT-The goal of this work was to develop a model to predict the occurrence of Ecdytolopha aurantiana (Lima), based on monitoring data collected through sexual pheromone traps. Soil type, site temperature, citrus variety, age of plants and use of chemicals to control E. aurantiana influenced the population dynamics of the insect. The highest influence was exerted by the soil type, followed by site temperature, citrus variety, age of plants and the use of chemicals for E. aurantiana control. The occurrence of E. aurantiana according to temperature is different for each combination of soil type, citrus variety, age of plants and use of chemicals. The model developed can predict the occurrence potential of E. aurantiana according to temperature or months of the year, taking into account soil type, citrus variety, age of plants and chemicals spraying. The elaborated software (BF), designed in R language, includes equations that simulate the various situations of E. aurantiana occurrence. The predicting model of citrus fruit borer occurrence can be improved with more frequent and continuous data collecting.

Neotropical Entomology, 2005

Anais da Sociedade Entomológica do Brasil, 2000

A well known case of ineffective natural biological control: the puzzling coexistence of the coff... more A well known case of ineffective natural biological control: the puzzling coexistence of the coffee leaf miner, Leucoptera coffeellum (Guérin-Mèneville), and its natural enemies was analyzed. Despite being a suitable prey to eight parasitoid species and three wasp species, all occurring simultaneously, the coffee leaf miner too often presents populations far above the damaging level for the coffee plantation. It is demonstrated that predatory wasps and parasitoids interact negatively, possibly because predatory wasps kill parasitized miner's larvae. In doing so, predatory wasps indirectly kill parasitoids, thereby impairing the efficacy of the natural biological control. It is warned that biological control programs should be based on knowledge of food web interactions, rather than simply on strategies involving introduction of exotic natural enemies.

Anais da Sociedade Entomológica do Brasil, 1999

We propose a shift in the traditional way to teach Entomology for undergraduate and postgraduate ... more We propose a shift in the traditional way to teach Entomology for undergraduate and postgraduate courses. We envisage a system in which undergraduate and postgraduate students interact, discussing Entomology outside the classroom. This would get them to actively seek for knowledge, rather than being paternalistically told how they should learn. Such a system does not preclude lectures as a didactic strategy, nor it rules out lecturers as responsible for instructorship. On the contrary, we believe lectures and discussion outside classroom are complementary for effective teaching. Our results show that undergraduate and postgraduate students who interact outside classroom are able to get better grades even when submitted to traditional written tests. Moreover, it seems that postgraduate students who get involved in such a system get permanent jobs faster than those postgraduates not taking part in it. Apparently, the key here was that when discussing outside classroom, students are al...

Journal of Chemical Ecology, 2011

The tomato leafminer Tuta absoluta (Lepidoptera: Gelechiidae) is a devastating pest of cultivated... more The tomato leafminer Tuta absoluta (Lepidoptera: Gelechiidae) is a devastating pest of cultivated tomato Solanum lycopersicum throughout South and Central America and Europe. We aimed to characterize the behavioral mechanisms and the chemical cues involved in host selection of T. absoluta females by chemical analysis of tomato leaf volatiles, wind tunnel attraction assays, and oviposition bioassays. Tomato leaf odor elicited in mated females upwind orientation flight followed by landing as well as egg-laying, demonstrating the essential role of plant volatiles in T. absoluta host-finding behavior. In wind tunnel and oviposition choice experiments, T. absoluta females significantly preferred tomato S. lycopersicum over wild tomato Solanum habrochaites, which is resistant to larval feeding. This indicates that leaf volatiles provide information on the suitability of plants as larval hosts. Mated females also discriminated three cultivars of S. lycopersicum according to their volatile profiles. Headspace collections from leaves of these three cultivars contained large amounts of β-phellandrene, followed by limonene, 2-carene, and (E)β-caryophyllene, which together accounted for more than 70% of tomato foliage headspace. Most leaf volatiles were released by all three cultivars, but they showed significant differences with respect to the presence of a few minor compounds and blend proportion. This is an initial study of the volatile signatures that mediate attraction and oviposition of tomato leafminer T. absoluta in response to its main host, tomato.

Ethology, 2008

The effects of pupal period and age on calling behavior of virgin females of Pseudaletia sequax w... more The effects of pupal period and age on calling behavior of virgin females of Pseudaletia sequax were determined. Calling behavior of groups of females of similar age of pupation was observed every 10 min for six calling days. Females were considered calling when they assumed a characteristic position: wings and abdomen elevated, displaying the ovipositor and presumably releasing pheromone. Calling behavior was discontinuous. Females with a shorter pupal period took more time to start calling than females with a longer pupal period and called for a longer period. On the first day of calling, females took more time to initiate calling, on average during the seventh hour of the scotophase, whereas on the second day of calling, most females initiated calling during the fifth hour of the scotophase. On subsequent days of calling, the average time to initiate calling changed to the fourth hour of the scotophase. The mean time of calling per day decreased significantly with the number of days since first calling, and the mean number of calling bouts increased with days since first calling.

Despite the well known diversity of termites capable of inhabiting arboreal environments, the det... more Despite the well known diversity of termites capable of inhabiting arboreal environments, the determinants of tree exploitation by termites remain largely unknown. Data collected on trees exploited by termites in Brazilian Atlantic rainforest, a hot spot of diversity, reveals that whereas termite presence on trees is positively related simply to tree size, termite activity within arboreal tunnels depends on tree size and growth form. This leads us to hypothesize that termites find large trees randomly but keep higher activity in large trees due to the availability of food and arboreal nesting sites.