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Search Results: 1 - 10 of 207076 matches for " HéCTOR GONZáLEZ-HERNáNDEZ "
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Enemigos naturales de escamas armadas (Hemiptera: Diaspididae) en aguacate Hass en Michoacán, México Natural enemies of armored scale (Hemiptera: Diaspididae) on avocado Hass in Michoacan Mexico
CARLOS LáZARO-CASTELLANOS,HéCTOR GONZáLEZ-HERNáNDEZ,J. REFUGIO LOMELI-FLORES,SVETLANA N. MYARTSEVA
Revista Colombiana de Entomología , 2012,
Abstract: Se identificaron enemigos naturales asociados a escamas armadas en aguacate Hass, y el porcentaje de parasitoidismo en ramas y frutos. Los muestreos se realizaron en huertas certificadas para exportación en Michoacán, México. De julio de 2009 a septiembre de 2010 se colectaron quincenalmente escamas armadas y sus entomófagos en cinco huertos, mientras que en nueve se realizaron muestreos bimestrales (mayo a septiembre) para determinar niveles de parasitoidismo. En cada muestreo se contó por especie el total de escamas vivas y parasitadas por estadio. Se identificaron tres especies de escamas armadas Hemiberlesia lataniae, Abgrallaspis aguacate y Hemiberlesia rapax, las cuales infestan hojas, ramas y frutos, que se presentaron en diez, seis y dos huertas, respectivamente. Los entomófagos identificados fueron: Encarsia citrina, presente en diez huertas y la más abundante con 108 especímenes, Encarsia juanae en cuatro huertas, y con 69 especímenes colectados, Plagiomerus nr. diaspidis con cuatro huertas, y 65 especímenes, Signiphora nr. borinquensis con seis huertas y 23 especímenes, Marietta mexicana en una huerta con cinco especímenes, Aphytis sp. presente en una huerta con dos especímenes y Chilocorus cacti en dos huertas con cinco especímenes. El porcentaje de parasitoidismo fue mayor en ramas que en frutos y aumentó en los meses de julio y septiembre de 2010, influenciado posiblemente por mayores temperaturas y humedad relativa. Encarsia citrina es el parasitoide con mejor perspectiva en manejo de escamas armadas debido a que parasita las tres especies de escamas armadas, tiene mayor distribución, abundancia, y está presente la mayor parte del a o. Natural enemies associated to armored scales on avocado Hass, and the percentage of parasitoidism on branches and fruits were recorded. The study was conducted on 14 avocado Hass orchards certified for exportation in the State of Michoacan, Mexico. From July 2009 to September 2010, armored scales and their entomophagous were collected in five orchards biweekly; meanwhile, in nine different orchards, levels of parasitoidism on armored scales were assessed bimonthly (from May to September 2010). The totals of scales species alive and parasitized scales per stage were recorded for each sample. The armored scales Hemiberlesia lataniae, Abgrallaspis aguacatae and Hemiberlesia rapax were found infesting avocado leaves, branches and fruits. These armored scales were collected in ten, six, and two orchards respectively. The entomophagous insects recognized were Encarsia citrina present in 10 orchards and the most a
EVALUACIóN DE UN CEBO FEROMONAL PARA LA CAPTURA DEL PICUDO DEL AGAVE (COLEOPTERA: CURCULIONIDAE)
Hilda RODRíGUEZ-REBOLLAR,Julio C. ROJAS,Héctor GONZáLEZ-HERNáNDEZ,Laura Delia ORTEGA-ARENAS
Acta zoológica mexicana , 2012,
Abstract: El picudo del agave, Scyphophorus acupunctatus Gyllenhal, es una plaga de importancia económica en diferentes cultivos de agaves en México, principalmente en agave tequilero, agave mezcalero y henequén. Los machos de esta especie liberan una feromona de agregación que atrae a ambos sexos, la feromona esta compuesta por dos alcoholes y dos cetonas. Experimentos previos han mostrado que los cuatro compuestos son atractivos a los picudos del agave, pero las mayores capturas se obtuvieron cuando se combinaron la 2-metil-4-heptanona (C1) y la 2-metil-4-octanona (C2). En el presente estudio se realizaron experimentos en campo para evaluar el efecto de las proporciones (1:1, 1:2, 1:4, 2:1 y 4:1) y la dosis (50, 100, 150, 200, 350, y 500 mg) de C1 y C2 en la captura de los picudos. Los resultados muestran que las diferentes proporciones probadas de los dos componentes feromonales no afectaron las capturas de los insectos. De hecho las trampas cebadas con C2 tuvieron mayores capturas que trampas cebadas con la combinación de los dos compuestos. Con respecto al otro factor evaluado, nuestros resultados muestran que la dosis no afectó las capturas de trampas cebadas con la feromona. Las trampas cebadas con los compuestos feromonales sintéticos capturaron más hembras que machos.
Parasitismo natural e inducido de Anagyrus kamali sobre la cochinilla rosada en brotes de teca, en Bahía de Banderas, Nayarit
García-Valente, Félix;Ortega-Arenas, Laura D.;González-Hernández, Héctor;Villanueva-Jiménez, Juan A.;López-Collado, José;González-Hernández, Alejandro;Arredondo-Bernal, Hugo C.;
Agrociencia , 2009,
Abstract: the parasitoid anagyrus kamali moursi is used in biological control programs against pink hibiscus mealybug (phm) maconellicoccus hirsutus (green). however, detailed studies on its impact in field conditions are needed. this study evaluated natural and induced parasitism of a. kamali against phm on teak shoots covered with organza sleeves under field conditions in bahía de banderas, nayarit, méxico. the treatments were 1) exclusion of natural enemies, 2) natural parasitism, and 3) induced parasitism (a. kamali). the effect of the treatments was determined by recording the numbers of phm nymphs, adult females and ovisacs as well as the number of parasitoid mummies 15 and 30 d after treatments were established. the parasitoid a. kamali regulated the population growth of phm on the sprouts covered with organza sleeves under field conditions. the average reduction of the pest was 96.5 % in 30 d. natural parasitism was negligible in regulating the pest and did not prevent its increase; this was attributed to interference of ants and to the negative impact of hyperparasitoids.
Efecto de Cryptolaemus montrouzieri (Coleoptera: Coccinellidae) en la actividad parasitoide de Anagyrus kamali (Hymenoptera: Encyrtidae) sobre Maconellicoccus hirsutus (Hemiptera: Pseudococcidae) Effect of Cryptolaemus montrouzieri (Coleoptera: Coccinellidae) in the parasitoid activity of Anagyrus kamali (Hymenoptera: Encyrtidae) on Maconellicoccus hirsutus (Hemiptera: Pseudococcidae)
SALVADOR HERNáNDEZ-MORENO,HéCTOR GONZáLEZ-HERNáNDEZ,J. REFUGIO LOMELI-FLORES,ESTEBAN RODRíGUEZ LEYVA
Revista Colombiana de Entomología , 2012,
Abstract: En varios países se ha introducido Anagyrus kamali y Cryptolaemus montrouzieri para el control de la cochinilla rosada del hibisco (CRH) Maconellicoccus hirsutus, pero no se han establecido las interacciones entre estos enemigos naturales. En el presente trabajo se evaluó en condiciones de laboratorio la interacción de C. montrouzieri (larvas de cuarto estadio y hembras adultas) en la actividad parasitoide de A. kamali sobre la CRH. Para determinar la interacción entre el depredador y el parasitoide se realizaron pruebas de liberación individual y simultánea de ambas especies en pruebas de elección y no elección, utilizando como alimento ninfas de tercer estadio de CRH no parasitadas y parasitadas por A. kamali. Las ninfas parasitadas tenían diferentes periodos de maduración del parasitoide (huevo, larva joven, larva madura, pupa joven y pupa madura). Los resultados mostraron que la presencia de C. montrouzieri redujo la actividad parasitoide de A. kamali a un 2,2 y 5%. En las pruebas de elección C. montrouzieri no discriminó entre CRH sanas y parasitadas de menos de 5 días. En las pruebas de no elección, los adultos y larvas de C. montrouzieri disminuyeron su actividad depredadora sobre CRH parasitadas de más de 6 días, posiblemente debido al endurecimiento de las momias de CRH. Los resultados del presente trabajo apoyan la hipótesis de que en la interacción de C. montrouzieri y A. kamali existe un efecto de interferencia en presencia de un recurso limitado, ya que la presencia del depredador disminuyó la actividad parasitoide de A. kamali en el control de CRH. In several countries, Anagyrus kamali and Cryptolaemus montrouzieri have been introduced for the biological control of the pink hibiscus mealybug (PHM) Maconellicoccus hirsutus, but there is not a formal study to assess the interaction between those natural enemies. In the present study we evaluated, under laboratory conditions, the interaction of C. montrouzieri (forth-instar larvae and adult female) in A. kamali parasitoid activity on PHM. Individual and simultaneous liberations of both species, using choice and no-choice tests, were made in order to determine the interaction between the predator and the parasitoid. Third PHM nymphs parasitized by A. kamali at different parasitoid maturation periods (egg, young larvae, mature larvae, young pupae and mature pupae) were used as hosts. The results showed that C. montrouzieri reduced the parasitoid activity of A. kamali to 2.2 and 5%. In the choice test, C. montrouzieri did not discriminate against wealthy PHM and parasitoized under five days. In
Melolonthidae nocturnos (Coleoptera) recolectados en la zona agrícola agavera de Jalisco, México
Gabriel Antonio Lugo-García,Laura Delia Ortega-Arenas,Héctor González-Hernández,Agustín Aragón-García
Acta zoológica mexicana , 2011,
Abstract: Con la finalidad de conocer la fauna de melolóntidos nocturnos en las zonas agaveras de mayor importancia en el estado de Jalisco, se realizaron capturas mensuales de mayo a agosto de 2007, utilizando una trampa de luz fluorescente negra tipo embudo, en Ixtlahuacán del Río, Tepatitlán de Morelos y San Juanito de Escobedo, Jalisco, México. Se recolectaron un total de 57,263 especímenes pertenecientes a 20 especies. Phyllophaga ravida (Blanchard) (58.7%), Paranomala cincta (Say) (14.1%), Phyllophaga misteca (Bates) (11.6), P. dentex (Bates) (2.5%) y Paranomala hoepfneri (Bates) (1.8%) fueron las especies mejor representadas. La mayor abundancia se presentó en el mes de junio (96%) y la menor en el mes de julio (0.02%). La mayor riqueza específica (17 especies) se presentó en Tepatitlán de Morelos. Se incluye una clave para identificar las especies encontradas.
？Afectan los aclareos la acumulación de biomasa aérea en una plantación de Pinus patula?
Rodríguez-Ortíz, Gerardo;Aldrete, Arnulfo;González-Hernández, Víctor A.;De Los Santos-Posadas, Héctor M.;Gómez-Guerrero, Armando;Fierros-González, Aurelio M.;
Agrociencia , 2011,
Abstract: thinning may modify distribution and amount of aboveground biomass according to time of response and growth conditions. in this study, the effect of thinning on distribution and accumulated aboveground biomass content of pinus patula was analyzed in 2009 through destructive samplings of 30 trees, after having been subjected to different thinning intensities since 2004, plus an intact control. elimination between 40 and 69 % of initial plantation density significantly affected (p≤0.05) quantity and distribution of leaf biomass and the amount of timber with bark on the stem at individual tree level in some tree components (but not by ha). the high thinning intensity (65.3 and 68.7 %) and respective low residual density generated the largest accumulation of foliar biomass (5.4 kg tree-1 and 8.0 t ha-1), surpassing (p≤0.05) the control without thinning (1.5 kg tree-1). in timber biomass with stem bark, trees with thinning also surpassed (p≤0.05) the control (98 fs. 35.3 kg tree-1). however, biomass accumulation per unit was similar between both conditions, due to excessive residual density of the control; the same occurred in total branch biomass and in distribution on the stem.
Modelos para estimar crecimiento y eficiencia de crecimiento en plantaciones de Pinus patula en respuesta al aclareo
Rodríguez-Ortiz, Gerardo;González-Hernández, Víctor A.;Aldrete, Arnulfo;Santos-Posadas, Héctor M. De Los;Gómez-Guerrero, Armando;Fierros- González, Aurelio M.;
Revista fitotecnia mexicana , 2011,
Abstract: the strong linear relationship between projected leaf area (la) of a tree and the sapwood area (sw) or living tissue in the stem (i.e.,la:sw) can be used to evaluate the growth efficiency (ge) of a forest. the objective of this research was to estimate and analyze the ratio la:sw and the growth efficiency of pinus patula schl. et cham. trees planted and thinned in 2004 at ixtlán, oaxaca, méxico. in the summer 2009, 30 trees in six plots corresponding to six thinning levels, were cut in order to estimate la and sw area, as well as for measuring different ge indices. we found that thinning caused significant gains (p ≤ 0.05) in sw, af, stem and basal branch diameters, and in wood volume per tree. sw of the transversal section of the stump (0.30 m) is the best tree section for estimating la with the model lf = 0.090(sw)-0.395, (r2 = 0.82); with this model we estimated that each square centimeter of sw at the stump, at 1.30 m and at the living crown sections of the stem are supplying sap to 0.082, 0.090 and 0.149 m2 of la, respectively. the annual increase in wood volume (maiv) can be predicted as a function of la with the linear model: maiv = 3.68+0.58(la), (r2 = 0.70); this model shows that wood volume (mviv) would increase when la is increased. even when in this study we found no significant effect (p ≥ 0.05) of tree thinning rates on the annual rate of wood volume growth (mviv) (12.7 dm3 of wood per m2 of la in thinned plots vs. 11.0 in non thinned plot), after five years the total wood volume per tree in thinned plots was higher (p < 0.05) by 50 to 275 % compared to the non thinned control.
Genitalia de tres especies de Heilipus Germar (Coleoptera: Curculionidae) que da？an frutos de aguacate (Persea americana Mill) en México y Costa Rica
Casta？eda-Vildózola, Alvaro;Valdez-Carrasco, Jorge;Equihua-Martínez, Armando;González-Hernández, Héctor;Romero-Nápoles, Jesús;Solís-Aguilar, Juan F.;Ramírez-Alarcón, Samuel;
Neotropical Entomology , 2007, DOI: 10.1590/S1519-566X2007000600013
Abstract: the male and female genitaliae of three species of the genus heilipus germar (h. lauri boheman, h. pittieri barber and h. trifasciatus fabricius) that damage avocado fruits (persea americana mill.) in mexico and costa rica are described and illustrated. the aedeagus, spiculum gastrale, styli of 8th sternite are different in each one of the three species studied and can be used for specific identification.
Evaluación de un cebo feromonal para la captura del picudo del agave (Coleoptera: Curculionidae)
RODRíGUEZ-REBOLLAR, Hilda;ROJAS, Julio C.;GONZáLEZ-HERNáNDEZ, Héctor;ORTEGA-ARENAS, Laura Delia;EQUIHUA-MARTíNEZ, Armando;DEL REAL-LABORDE, José Ignacio;LóPEZ-COLLADO, José;
Acta zoológica mexicana , 2012,
Abstract: the agave weevil, scyphophorus acupunctatus gyllenhal, is considered the most important insect pest of the cultivated agaves in mexico. recent studies on the chemical ecology of this weevil have shown that males release a pheromone that attracts both sexes; the pheromone is composed of four components. previous field experiments showed that all components, singled or in blends, were attractive to the weevils, but compounds 2-methyl-4-heptanone (c1) and 2-methyl-4-octanone (c2) were sufficient to obtain captures equivalent to those by the quaternary blend. in this study, we investigated the effect of different ratios (1:1, 1:2, 1:4, 2:1, and 4:1) and doses (50, 100, 150, 200, 350, and 500 mg) of c1 and c2 in the captures of the agave weevils in commercial plantations of agave tequilana weber. our results showed that traps baited with synthetic pheromone captured more weevils than traps baited with adult male weevils but the different ratios of c1 and c2 did not affect the weevils capture. in fact, traps baited with c2 caught more weevils than those baited with the binary blend. also, we found that weevil's capture was not affected by dose. in general, traps baited with the synthetic pheromonal components caught more females than males.
Melolonthidae nocturnos (Coleoptera) recolectados en la zona agrícola agavera de Jalisco, México
LUGO-GARCíA, Gabriel Antonio;ORTEGA-ARENAS, Laura Delia;GONZáLEZ-HERNáNDEZ, Héctor;ARAGóN-GARCíA, Agustín;ROMERO-NáPOLES, Jesús;RUBIO-CORTéS, Ramón;MORóN, Miguel ángel;
Acta zoológica mexicana , 2011,
Abstract: in order to know the nocturnal fauna of melolonthidae from the main agave tequilero fields in jalisco, mexico, monthly captures of adults were carried out from may to august 2007, using a fluorescent light black trap, funnel type, in ixtlahuacán del río, tepatitlán de morelos and san juanito de escobedo, jalisco, mexico. a total of 57,263 specimens included in 20 species were collected. phyllophaga ravida (blanchard) (58.7%), paranomala cincta (say) (14.1%), phyllophaga misteca (bates) (11.6), p. dentex (bates) (2.5%) and paranomala hoepfneri (bates) (1.8%) were the best represented species. the highest abundance was registered in june (96%) and the lowest capture in july. the greatest species richness (17 species) was recorded in tepatitlán de morelos. a key to identify the recorded species is included.
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