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PATOGENICIDAD DE AISLAMIENTOS CHILENOS DE Beauveria bassiana EN ADULTOS DE Asynonychus cervinus (Boh.) (Coleoptera: Curculionidae)
France,Andrés; Gerding,Marcos; Sandoval,Alicia;
Agricultura Técnica , 2002, DOI: 10.4067/S0365-28072002000400001
Abstract: four native isolates of beauveria bassiana were evaluated for food consumption and mortality over time against adults of asynonychus cervinus (boh.) through inoculation at different concentrations (0-108 conidia ml-1). the results indicated that food intake of insects treated with b. bassiana decreased linearly, reducing 70% consumption after 35 days. as to mortality, no differences were observed among the four isolates, all were lethal for a. cervinus and the deadliness increased with the concentrations of the isolate. from the mortality curves, the lethal concentrations lc50 and lc90 were calculated, and the best isolate (qu-b299) had values of 1x104.7 and 1x108.3 conidia ml-1, respectively.
Selection of Native Fungi Strains Pathogenic to Vespula germanica (Hymenoptera: Vespidae)
Merino,Loreto; France,Andrés; Gerding,Marcos;
Agricultura Técnica , 2007, DOI: 10.4067/S0365-28072007000400001
Abstract: the yellowjacket wasp, vespula germanica f., is considered a serious pest of productive and recreational activities worldwide. a pathogenicity study was carried out with 29 strains of metarhizium anisopliae and 30 of beauveria bassiana against worker and male wasps. wasps of the same age were fed with liquid sugar baits containing 1 x 108 conidia ml-1 suspensions of each strain. the highest mortality and sporulation were obtained with the strains qu-b941 and qu-b933 of beauveria bassiana, reaching 79 and 95% mortality for workers and 66 and 73% for males, respectively. the strains were tested on workers of v. germanica with increasing amounts of bait from 0 to 1 x 108 conidia ml-1. the results also showed that 1 x 108 conidia ml-1 increased up to 90 and 97% the mortality of workers with qu-b941 and qu-b933 strains, respectively.
Selection of Native Fungi Strains Pathogenic to Vespula germanica (Hymenoptera: Vespidae) Selección de Aislamientos Nativos de Hongos Patogénicos a Vespula germanica (Hymenoptera: Vespidae)
Loreto Merino,Andrés France,Marcos Gerding
Agricultura Técnica , 2007,
Abstract: The yellowjacket wasp, Vespula germanica F., is considered a serious pest of productive and recreational activities worldwide. A pathogenicity study was carried out with 29 strains of Metarhizium anisopliae and 30 of Beauveria bassiana against worker and male wasps. Wasps of the same age were fed with liquid sugar baits containing 1 x 10(8) conidia mL-1 suspensions of each strain. The highest mortality and sporulation were obtained with the strains Qu-B941 and Qu-B933 of Beauveria bassiana, reaching 79 and 95% mortality for workers and 66 and 73% for males, respectively. The strains were tested on workers of V. germanica with increasing amounts of bait from 0 to 1 x 10(8) conidia mL-1. The results also showed that 1 x 10(8) conidia mL-1 increased up to 90 and 97% the mortality of workers with Qu-B941 and Qu-B933 strains, respectively. La avispa chaqueta amarilla, Vespula germanica F., es una especie cosmopolita, considerada en muchos países como un problema serio para el desarrollo de actividades productivas y recreativas. Entre las nuevas alternativas para el control de la plaga está el uso de hongos entomopatógenos. Se estudió la patogenicidad de 29 aislamientos de Metarhizium anisopliae y 30 de Beauveria bassiana, sobre obreras y machos de la avispa. La evaluación se realizó sobre adultos de igual edad, administrando dosis de 1 x 10(8) conidia mL-1 de cada aislamiento, en cebos líquidos azucarados. La mortalidad y esporulación de los aislamientos de Beauveria bassiana Qu-B941 y Qu-B933 fueron significativamente mayores, alcanzando porcentajes de mortalidad de 79 y 95% para obreras y de 66 y 73% para machos, respectivamente. Estos aislamientos fueron evaluados en cebos con suspensiones crecientes de 0 a 1 x 10(8) conidia mL-1 sobre obreras de V. germanica. Los resultados obtenidos muestran que mayores concentraciones de inóculo incrementan significativamente los índices de mortalidad, alcanzando 90 y 97% para Qu-B941 y Qu-B933, respectivamente, con la máxima concentración de inóculo.
PATOGENICIDAD DE AISLAMIENTOS CHILENOS DE Beauveria bassiana EN ADULTOS DE Asynonychus cervinus (Boh.) (Coleoptera: Curculionidae) Pathogenicity of chilean isolates of Beauveria bassiana to adults of Asynonychus cervinus (Coleoptera: Curculionidae)
Andrés France,Marcos Gerding,Alicia Sandoval
Agricultura Técnica , 2002,
Abstract: Se evaluó el efecto de cuatro aislamientos nativos de Beauveria bassiana sobre el consumo de alimento y la mortalidad a través del tiempo de adultos de Asynonychus cervinus, mediante inmersión a distintas concentraciones de inóculo (0-10(8)conidias mL-1). Los resultados indicaron que los insectos tratados con B. bassiana redujeron el consumo de alimento en forma lineal, disminuyendo en 70% su consumo a los 35 días. En cuanto a la mortalidad, los cuatro aislamientos no presentaron diferencias entre ellos, todos fueron letales para A. cervinus y la letalidad aumentó junto a las concentraciones de inóculo. A partir de las curvas de mortalidad se calcularon las concentraciones letales CL50 y CL90, donde la mejor aislación (Qu-B299) obtuvo valores de 1x10(4,7) y 1x10(8,3) conidias mL-1, respectivamente. Four native isolates of Beauveria bassiana were evaluated for food consumption and mortality over time against adults of Asynonychus cervinus (Boh.) through inoculation at different concentrations (0-10(8) conidia mL-1). The results indicated that food intake of insects treated with B. bassiana decreased linearly, reducing 70% consumption after 35 days. As to mortality, no differences were observed among the four isolates, all were lethal for A. cervinus and the deadliness increased with the concentrations of the isolate. From the mortality curves, the lethal concentrations LC50 and LC90 were calculated, and the best isolate (Qu-B299) had values of 1x10(4.7) and 1x10(8.3) conidia mL-1, respectively.
PATOGENICIDAD DE UNA COLECCIóN DE CEPAS NATIVAS DE Metarhizium spp. Y Beauveria spp. EN Aegorhinus superciliosus, Asynonychus cervinus Y Otiorhynchus sulcatus.
France I.,Andrés; Gerding G.,Macarena; Gerding P,Marcos; Sandoval V,Alicia;
Agricultura Técnica , 2000, DOI: 10.4067/S0365-28072000000300001
Abstract: different isolates of the entomopathogenic fungi beauveria and metarhizium, collected throughout chile, were screened for three important curculionid (weevil) pests. nine beauveria and 10 metarhizium isolates were evaluated on adults of aegorhinus superciliosus, 37 beauveria isolates on asynonychus cervinus larvae and 24 metarhizium on otiorhynchus sulcatus adults. inoculated insects were observed daily and compared using a mortality index. the most effective isolates were m430 and b306 for a. superciliosus, b 179 for a. cervinus and m151b for o. sulcatus. there were also numerous strains that caused low or very reduced insect mortality, suggesting the specificity of the different fungi for different insects. the foregoing justifies the search for new and better isolates, as well as additional laboratory and field evaluation of the better strains.
PATOGENICIDAD DE UNA COLECCIóN DE CEPAS NATIVAS DE Metarhizium spp. Y Beauveria spp. EN Aegorhinus superciliosus, Asynonychus cervinus Y Otiorhynchus sulcatus. Pathogenicity of a Chilean wild collection of Metarhizium spp. and Beauveria spp. on Aegorhinus superciliosus, Asynonychus cervinus and Otiorhynchus sulcatus.
Andrés France I.,Macarena Gerding G.,Marcos Gerding P,Alicia Sandoval V
Agricultura Técnica , 2000,
Abstract: Se realizó una evaluación con diferentes aislamientos de los hongos entomopatógenos Beauveria y Metarhizium, colectados a lo largo de Chile, en tres especies de curculiónidos de importancia agrícola. Nueve cepas de Beauveria y 10 de Metarhizium fueron evaluados en adultos de Aegorhinus superciliosus, 37 aislamientos de Beauveria con larvas de Asynonychus cervinus y 24 cepas de Metarhizium en adultos de Otiorhynchus sulcatus. Los insectos inoculados fueron evaluados diariamente y comparados a través de índices de mortalidad. Diferentes niveles de patogenicidad fueron detectados entre las cepas, destacándose como los más efectivos los aislamientos M430 y B306 para A. superciliosus, B179 con A. cervinus y M151b para O. sulcatus. También hubo numerosas cepas que no causaron mortalidad o ésta fue muy reducida, indicando una especificidad de los distintos hongos para diferentes insectos. Lo anterior justifica la búsqueda de nuevos y mejores aislamientos, así como la evaluación en terreno de las mejores cepas. Different isolates of the entomopathogenic fungi Beauveria and Metarhizium, collected throughout Chile, were screened for three important curculionid (weevil) pests. Nine Beauveria and 10 Metarhizium isolates were evaluated on adults of Aegorhinus superciliosus, 37 Beauveria isolates on Asynonychus cervinus larvae and 24 Metarhizium on Otiorhynchus sulcatus adults. Inoculated insects were observed daily and compared using a mortality index. The most effective isolates were M430 and B306 for A. superciliosus, B 179 for A. cervinus and M151b for O. sulcatus. There were also numerous strains that caused low or very reduced insect mortality, suggesting the specificity of the different fungi for different insects. The foregoing justifies the search for new and better isolates, as well as additional laboratory and field evaluation of the better strains.
Selección de Aislamientos de Hongos Entomopatógenos para el Control de Huevos de la Polilla del Tomate, Tuta absoluta Meyrick (Lepidoptera: gelechiidae)
Rodríguez S.,Marta; Gerding P.,Marcos; France,Andrés;
Agricultura Técnica , 2006, DOI: 10.4067/S0365-28072006000200005
Abstract: a pathogenicity study of 64 metarhizium anisopliae var. anisopliae and 70 beauveria bassiana isolates against tomato moth tuta absoluta eggs, was carried out under laboratory conditions. the first evaluation was accomplished by spraying suspensions of 107 conidias ml-1 of each isolate directly on eggs, through a potter tower. mortality and conidia production on the eggs were significantly higher with the isolates m. anisopliae qu-m558 and b. bassiana qu-b911, qu-b912 and qu-b928. these isolates were newly evaluated using increasing conidia concentrations (0 to 108 conidia ml-1) of each of the five selected isolates. the isolates qu-b912 and qu-m558 produced the highest mortality percentages based on the area under mortality progress curve for each concentration, 80 and 60%, respectively.
Selección de Aislamientos de Hongos Entomopatógenos para el Control de Huevos de la Polilla del Tomate, Tuta absoluta Meyrick (Lepidoptera: gelechiidae) Entomopathogenic Fungi Isolates Selection for Egg Control of Tomato Moth Tuta absoluta Meyrick (Lepidoptera: gelechiidae) Eggs
Marta Rodríguez S.,Marcos Gerding P.,Andrés France
Agricultura Técnica , 2006,
Abstract: Se realizó un estudio en laboratorio sobre la patogenicidad de 64 aislamientos de Metarhizium anisopliae var. anisopliae y 70 de Beauveria bassiana, en huevos de polilla del tomate Tuta absoluta. La primera evaluación se realizó por aplicación directa de suspensiones de 10(7) conidias mL-1 para cada aislamiento, con el sistema de pulverización de la torre de Potter. La mortalidad y esporulación sobre huevos fueron significativamente mayores con los aislamientos M. anisopliae Qu-M558 y B. bassiana Qu-B911, Qu-B912 y Qu-B928. Estos aislamientos fueron evaluados nuevamente en suspensiones crecientes de 0 a 10(8) conidias mL-1. Los aislamientos Qu-M558 y Qu-B912, produjeron los mayores porcentajes de mortalidad sobre la base del cálculo del área bajo la curva del progreso de mortalidad de huevos, 80 y 60%, respectivamente. A pathogenicity study of 64 Metarhizium anisopliae var. anisopliae and 70 Beauveria bassiana isolates against tomato moth Tuta absoluta eggs, was carried out under laboratory conditions. The first evaluation was accomplished by spraying suspensions of 10(7) conidias mL-1 of each isolate directly on eggs, through a Potter tower. Mortality and conidia production on the eggs were significantly higher with the isolates M. anisopliae Qu-M558 and B. bassiana Qu-B911, Qu-B912 and Qu-B928. These isolates were newly evaluated using increasing conidia concentrations (0 to 10(8) conidia mL-1) of each of the five selected isolates. The isolates Qu-B912 and Qu-M558 produced the highest mortality percentages based on the area under mortality progress curve for each concentration, 80 and 60%, respectively.
EVALUACIóN DE DOS CEPAS DEL HONGO Metarhizium anisopliae var. anisopliae (Metsh.) PARA EL CONTROL DE LARVAS DE GUSANO BLANCO Hylamorpha elegans Burm. (COLEOPTERA: SCARABAEIDAE)
Rodríguez,Marta; France,Andrés; Gerding,Macarena;
Agricultura Técnica , 2004, DOI: 10.4067/S0365-28072004000100002
Abstract: the white grub, hylamorpha elegans burm., is a serious pest on cereals and pastures in chile. in laboratory and greenhouse studies, the pathogenicity of two metarhizium anisopliae var. anisopliae (metsh.) isolates: qu-m270 and qu-m802 on h. elegans larvae was evaluated. the first evaluation was carried out by immersion of third instar larvae in increasing suspensions, 0 to 108 conidia ml-1 of each isolate. the area under an accumulated mortality curve was calculated, observing differences (p = 0.032) between the isolates, with qu-m270 being 50% superior to qu-m802. the lc50 and lc90 for qu-m270 were 104.7 and 107.5 conidia ml-1, respectively. the greenhouse evaluation was carried out in pots with pasteurized soil and 10 larvae of h. elegans, on which four suspensions (0 to 1014 conidia ha-1) were pulverized. after thirty days, there were no significant differences in the mortality between doses of 1013 and 1014 conidia ha-1 (p < 0.05), with 95 and 94% of larval mortality, respectively, but there was a difference at 1012 conidia ha-1 (p = 0.045) with 74% mortality. it is concluded that qu-m270 was more effective in the control of h. elegans larvae.
Efectividad de Aislamientos de Hongos Entomopatógenos Sobre Larvas de Polilla del Tomate Tuta absoluta Meyrick (Lepidoptera: Gelechiidae)
Rodríguez,Marta; Gerding,Marcos; France,Andrés;
Agricultura Técnica , 2006, DOI: 10.4067/S0365-28072006000200006
Abstract: the tomato moth, tuta absoluta meyrick, is a serious pest on tomatoes (lycopersicon esculentum l.) crops in chile. laboratory studies were conducted to evaluate the virulence and effectiveness of the isolates metarhizium anisopliae var. anisopliae isolate qu-m558 and beauveria bassiana isolate qu-b912, on third instar of t. absoluta larvae. the first evaluation was carried out spraying directly on third instar larvae, spore suspensions (0 to 108 conidia ml-1) of each isolate through a potter tower. comparisons were made by calculating the area under a mortality progress curve. differences were not observed in the areas between isolates (p = 0.384). the lc50 and lc90 for qu-b912 were 104.4 and 107.6 conidia ml-1, and for qu-m558 were 105.4 and 109.1 conidia ml-1, respectively. a second evaluation was carried out spraying on tomato leaves spore suspensions (0 to 108 conidia ml-1) of qu-b912 isolate through a potter tower. third stage t. absoluta larvae were fed with these infected leaves. thirteen days after inoculation doses of 108 conidias ml-1 caused 68% of larvae mortality.
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