Examinando por Materia "Curculionidae"

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    Fluctuation of Premnobius cavipennis (Coleoptera: Curculionidae: Scolytinae) populations in balsa (Ochroma pyramidale) plantations in the central zone of the Ecuadorian Littoral.
    (Universidad del Valle, 2021-02-03) Averos, Joselyn Briggite; Castro Olaya, Jessenia; Martínez Chevez, Malena; Guachambala Ando, Marcelino; Peñarrieta Bravo, Soraya; Chirinos Torres, Dorys; García Cruzatti, Luz; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    This study aimed to determine the population fluctuation of Premnobius cavipennis and the effect of the trap height on balsa plantations (Ochroma pyramidale). The research was in El Vergel, El Empalme, and Guapara, three localities of Ecuador. There were used flight-interception traps with alcohol as an attractant, placed at one, four, and eight meters high. The collection and evaluation were carried out every week, for one year by locality. Premnobius cavipennis showed a population fluctuation throughout the year, with population peaks in months of the rainy season in the three locations. In El Vergel, the greatest abundance of P. cavipennis was found with 2,382 individuals, showing a population maximum in December. In El Empalme 1,263 individuals were captured, with population increases in January and April. In Guapara 525 individuals were registered, showing a population increase in March. There were captured individuals of P. cavipennis in the three heights of the traps in the three locations. There were highly significant differences between the heights, with a greater effect on the capture at one meter in the three locations of individuals at one meter, behavior that was the same in the three locations.
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    Fungi associated with Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae) in Tabasco, Mexico.
    (Universidad del Valle, 2019-12-31) Torres de La Cruz, Magdiel; Gerónimo Torres, José del Carmen; Ortiz García, Carlos Fredy; Ayala Escobar, Victoria; Pérez de La Cruz, Manuel; Cappello García, Silvia; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    In the state of Tabasco, Mexico, the coffee berry borer Hypothenemus hampei, was reported for the first time in 2004. Since then it has become the main insect pest of coffee in this area. The aim of the present study was to document the mycobiota associated to H. hampei adults in coffee plantations of three localities of Tabasco: Teapa, Tacotalpa and Huimanguillo. Coffee berries infested with the coffee berry borer were collected from the field and adults of H. hampei were extracted. The fungi that grew on the Scolytinae cadavers were isolated and identified using taxonomic keys. Two isolates of each morphological species were molecularly identified. A total of 74 isolates was obtained from the cuticle of H. hampei. Of them, 52 presented morphological affinity with Fusarium solani, five with F. oxysporum, five with F. verticillioides, one with Geotrichum candidum and 11 with Beauveria bassiana. The DNA sequences showed similarity with sequences found in GenBank, with homologies of 99 % and 100 %, which coincided with each morphological species. The most abundant species was F. solani (70.2 %), followed by B. bassiana (14.8 %). The species F. verticillioides and F. oxysporum represented each one, at 6.7 %, respectively. The least abundant was G. candidum (1.3 %). The findings of the species F. verticillioides and G. candidum are new reports of micromycetes fungi associated with H. hampei. This study contributes to the knowledge of the diversity of fungi associated with H. hampei.
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    Monitoring methods of weevil adults of citrus Compsus viridivittatus (Coleoptera: Curculionidae: Entiminae).
    (Universidad del Valle, 2019-12-31) Carabalí Muñoz, Arturo; Cardona, David Andrés; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    The efficiency of two adult monitoring methods for pest Compsus viridivittatus in several regions in Colombia: tarpaulin on the floor (TF), for the detection of adult populations in the tree, and cone-shaped ground traps (CT) for young populations emerging from the soil was evaluated. Studies were conducted in four independent plots located in Caicedonia (Valle del Cauca, Colombia), for 51 weeks in a completely randomized design with 20 replicates / method / plot / locality. The sampling effort in all localities amounted to 160 trees per week. During the study, 1,961 emergent adults (1,363 females: 598 males) were obtained using CT and 5,060 adults (3,117 females: 1,943 males) were obtained with TF. The highest average number of catches occurred during periods of maximum rainfall (60-103 mm / week), with 2.5 adults caught using CT and 5 adults caught using TF. Significant differences were found in the abundance of populations between plots; the TF range was 10-24 adults/trap and the CT range was 4-20 adults/trap. The sixty-six percent (66 %) correlation found between methods / plot suggests that changes in population abundance can be explained by the dynamics of populations emerging from the soil. In summary, the results indicate that independent use and / or combination of the methods can be useful as a criterion for decision making about the time and type of alternative to implement for the reduction of C. viridivittatus populations.
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    Odontopus abdominalis (Coleoptera: Curculionidae): a new avocado pest in northeastern Brazil.
    (Universidad del Valle, 2019-12-31) Broglio Micheletti, Lígia; Forti Broglio, Sônia Maria; Silva Dias Pini, Nivia Da; Gómez Torres, Mariuxi; Rodrigues Da Silva, Simone; Cantuarias Avilés, Tatiana Eugenia; Sociedad Colombiana de Entomología - Socolen; Universidad del Valle; Montoya Lerma, James
    This is the first report of Odontopus abdominalis as a novel pest in avocado orchards in the Alagoas State, in Northeastern Brazil. Adults feed and bore holes in the leaves, and larvae feed on the mesophyll tissue, boring galleries in the leaves. Leaf necrosis then reduces the photosynthetic tissue in the mesophyll. This study contributes relevant information for reporting O. abdominalis as a novel avocado pest in Brazil. This knowledge is essential for defining adequate pest management approaches.
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    Use of color traps and alcoholic attractants for the capture of the coffee berry borer (Hypothenemus hampei) in highly infested coffee plantations.
    (Universidad del Valle, 2019-12-31) Leiva Espinoza, Santos; Oliva Cruz, Manuel; Rubio Rojas, Karol; Maicelo Quintana, Jorge; Milla Pino, Manuel; Montoya Lerma, James
    Mass capture is a technique widely considered in the control of the coffee plague of greater economic importance in the world. This work was carried out in the province of Rodríguez de Mendoza, Amazonas region, Peru, with the objective of analyzing the effect of artisanal traps of different colors and attractive alcoholics in the capture of adults of coffee borer adults, Hypothenemus hampei, in a highly infested plantation, and its implication in reducing the incidence of damage caused by this pest. Six treatments generated from the combination of levels of the following color factors (transparent, red and green) and alcoholic attractants (without and with coffee essence) were evaluated. The test was conducted in a randomized complete block experiment design. The incidence of coffee berry bore damage was measured in periodic measurements every 30 days, while the capture levels (adults / trap) were evaluated every 15 days. The obtained data was subjected to an analysis of covariance, detecting statistically significant differences between the treatments and once applied the multiple comparisons test, specifically minimum significant difference, it was evidenced that the red trap without essence of coffee captured a greater number of adults (with a maximum of 4,000 adults / trap / week) and proved to be more effective in reducing the incidence (43.7 % less than the initial incidence). On the other hand, the least effective trap was the transparent one without coffee essence.