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Search Results: 1 - 10 of 406134 matches for " Simone M. Jahnke "
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Effect of Diet, Photoperiod and Host Density on Parasitism of Anisopteromalus calandrae on the Tobacco Beetle and Biological Parameters of the Parasitoid  [PDF]
Kássia C. F. Zilch, Simone M. Jahnke, Andreas K?hler, Eduarda Bender
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.812217
Abstract:

Lasioderma serricorne is known to be pest of tobacco, besides of attacking other products in storage. Anisopteromalus calandrae is an ectoparasitoid of coleopteran larvae also parasitizing the tobacco beetle. This study was aimed to evaluate the parasitism of A. calandrae on different densities of L. serricorne larvae grown in different diets and photoperiods, and to record the longevity and reproductive potential of A. calandrae. Individuals of L. serricorne were raised in three diets: wheat flour (F); wheat flour and brewer’s yeast (FY) and wheat flour and dried tobacco (FT). Different amounts of host larvae (10, 20, 50 and 100) for each diet were exposed to a couple of parasitoids. The same larval densities from diet F were exposed for 24 h to a couple of adult parasitoids maintained in three photoperiods (0:24, 12:12 and 24:0 - scotophase: photophase). The highest values of apparent parasitism were in the density of 50 larvae in the FY diet (96.34%) and 100 F (92.91%). There was no significant difference in the parameters in each photoperiod in all larval densities. However, the treatment in which hosts and parasitoids always remained in scotophase, was the one that had a significantly higher sex ratio. Females had longer longevity than males surviving for up to 25 days. On the fourth day of larvae exposure occurred, the maximum number of offspring generated. It is inferred that A. calandrae has potential to be used as a control agent for coleopterans that attack stored products.

Parasitismo em Phyllocnistis citrella Stainton (Lepidoptera: Gracillariidae) em pomares de Citros em Montenegro, RS
Jahnke, Simone M.;Redaelli, Luiza R.;Diefenbach, Lúcia M.G.;
Neotropical Entomology , 2006, DOI: 10.1590/S1519-566X2006000300010
Abstract: phyllocnistis citrella stainton, the citrus-leafminer, is an important pest of citrus worldwide. knowledge of natural parasitism levels is fundamental to the establishment of tactics of management and control of this species. this work aimed to evaluate the parasitism in two citrus orchards, one of 'montenegrina' (citrus deliciosa ten.) and the other of 'murcott' (c. sinensis (l.) osbeck x c. reticulata blanco), located in montenegro, rs. in fortnightly samplings, from july/2001 to june/2003, all leaves containing p. citrella pupae from randomly selected plants were collected and maintained individually until emergence of the parasitoids or the citrus-leafminer. parasitism was calculated considering the number of emerged parasitoids relative to the total number of emerged individuals. correlation and linear regression tests were done to evaluate the relationship and the influence of biotic and abiotic factors upon the parasitism index. in both orchards the greatest parasitism percentage was registered on autumn in both years. the total percentage was 36.2% in 'murcott' and 26.4% in 'montenegrina' in the first year, and 30.2% and 37.6%, respectively, in the second year. in 'murcott', this index did not differed between the years (c2 = 2.06; df = 1; p > 0.05), in 'montenegrina' the parasitism was significantly higher in the second year (c2 = 7.36; df = 1; p < 0.05). the correlation and linear regression tests indicated a strong influence, in the parasitism index, of the host populational density registered in the previous 45 and 135 days.
Galling arthropod diversity in adjacent swamp forests and restinga vegetation in Rio Grande do Sul, Brazil
Mendon?a Jr, Milton De S;Piccardi, Hosana M F;Jahnke, Simone M;Dalbem, Ricardo V;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000400008
Abstract: galling arthropods create plant structures inside which they find shelter. factors acting on galler diversity are still being discussed, with this fauna considered more diverse in xeric than mesic environments (higrothermic stress hypothesis, hsh), and also in more plant diverse sites. here we compare galler abundance (n), equitability (e), species richness (s) and composition between adjacent restinga (xeric) and swamp forests (mesic) in parque estadual de itapeva (29°21' s, 49°45' w), rio grande do sul, southern brazil. five trails, two in swamp forest and three in restingas, were sampled four times each (january/december 2005). after an effort of 60h/person, 621 galled plant individuals belonging to 104 gall morphotypes were recorded. this suggests a high galler diversity for the park, comparable to the richest places known. no differences were found for n, e or s between restingas and swamp forests. however, faunal composition differs significantly between the vegetation types. the dominant (most abundant) species are different in either vegetation type, and are rare or absent on the other vegetation type. such species composition analysis is still largely ignored for gallers, and stresses the fact that the hsh cannot explain this pattern, since the latter is based on preferences by the ovipositing galler for xeric sites instead of mesic ones. the two habitats differ in microclimate, but species richness, as would be predicted by the hsh, does not differ. this small scale pattern can perhaps be attributed to biogeographic processes on larger scales, as suggested by the resource synchronisation hypothesis.
Complexo de parasitóides de Phyllocnistis citrella (Lepidoptera, Gracillariidae) em dois pomares de citros em Montenegro, RS, Brasil
Jahnke, Simone M.;Redaelli, Luiza R.;Diefenbach, Lúcia M. G.;
Iheringia. Série Zoologia , 2005, DOI: 10.1590/S0073-47212005000400003
Abstract: several parasitoid wasps, mainly from eulophidae and chalcididae families, have been registered acting upon the citrus leafminer phyllocnistis citrella stainton, 1856 populations, one of the most important citrus pest worldwide. the present work aimed to identify the parasitoid complex of p. citrella in two citrus orchards, located in montenegro, rs: one of the montenegrina cultivar and the other of the hybrid tangor murcott. in fortnightly samplings from july 2001 to june 2003, all the buds of randomly rafted plants were inspected. all the leaves, with pupae of p. citrella, were collected and individually maintained in petri dishes until the emergence of parasitoids or adults of p. citrella. in the first year, 101 parasitoid individuals of the genus elasmus westwood, 1833, cirrospilus westwood, 1832, sympiesis f?rster, 1856 and galeopsomyia fausta lasalle, 1997 (eulophidae) were obtained. ageniaspis citricola logvinovskaya, 1983 (encyrtidae) was registered only in the 'murcott' orchard. this species was intentionally introduced in nearby orchards for the leafminer control. in the second year, a total of 609 parasitoid individuals were sampled, and a. citricola was also registered in the 'montenegrina' area. with the introduction and establishment of the exotic species in the orchards, occurred a great change in the species relative frequency. ageniaspis citricola represented more than 75% of the individuals occurring in both orchards in the second year, and the relative frequency of the native species decreasing. studies on the community of natural enemies associated to the citrus leafminer, and on the actual impact that the exotic species cause on the native ones are necessary before taking any measure of control.
Aspectos biológicos de Cirrospilus neotropicus Diez & Fidalgo (Hymenoptera: Eulophidae), parasitóide de Phyllocnistis citrella Stainton (Lepidoptera: Gracillariidae)
Foelkel, Ester;Redaelli, Luiza R.;Jahnke, Simone M.;Losekann, Paula B.;
Neotropical Entomology , 2008, DOI: 10.1590/S1519-566X2008000300006
Abstract: the biology of cirrospilus neotropicus diez & fidalgo reared on third instar phyllocnistis citrella stainton larvae having citrus limonia osbeck as host plant, was evaluated under controlled conditions (25 ± 1oc; 12h photophase). the survival, immatures development, longevity, sex ratio, host feeding and oviposition ratio of c. neotropicus, were registered. two groups of parasitoid females were evaluated: one, with parasitoids obtained from p. citrella pupae collected in citrus orchards and the other group came from laboratory rearing. these females, after mating, were maintained individually on gerbox containers with honey and pollen as food source. at each 48h, 12 p. citrella larvae were changed. the average biological cycle of the female progenies from orchard and laboratory generation groups were 11.8 and 11.6 days, respectively. the males progenies had biological cycles of 11.6 and 10.9 days, as well. the shortest immature survival period, for both studied groups was the larval (57.3% - orchard group and 57.4% - lab group). the mated females average longevity (21.8 days) was superior than the non mated ones (9.1 days) for the orchard group. the average daily oviposition rate for this last group was also significantly superior (2.8 eggs /day) than the lab group (1.6 eggs / day). the same trend was observed for the average daily host feeding rate (1.7 larvae /day for the orchard group and 0.9 larvae/ day for the lab group). these data suggest that c. neotropicus have potencial as a biological control agent of p. citrella.
Structure and composition of the assemblage of parasitoids associated to Phyllocnistis citrella Pupae Stainton (Lepidoptera: Gracillariidae) in citrus orchards in Southern Brazil
Jahnke, Simone M.;Redaelli, Luiza R.;Diefenbach, Lúcia M.G.;Dal Soglio, Fábio K.;
Neotropical Entomology , 2007, DOI: 10.1590/S1519-566X2007000500016
Abstract: the structure and composition of the assemblage of pupal parasitoids of phyllocnistis citrella stainton, the citrus leafminer, were studied in two citrus orchards (citrus deliciosa tenore cv. montenegrina and citrus sinensis (l.) osbeck x citrus reticulata blanco hybrid murcott), in montenegro county (29° 68?s and 51° 46?w), southern brazil. at fortnightly samplings, from july 2001 to june 2003, all the new shoots from 24 randomly selected trees were inspected. the species richness reached five native species in the murcott orchard, and six in montenegrina. in murcott, the presence of ageniaspis citricola (hymenoptera: encyrtidae), an exotic species, was detected in the first year of sampling, probably migrating from the nearby areas where it had been released for the miner control. in montenegrina, its presence was only registered in the second year. a. citricola in both areas was dominant and changed the community structure of parasitoid complex of p. citrella in both orchards.
Distribui??o espacial de posturas de Cosmoclopius nigroannulatus St?l (Hemiptera: Reduviidae) em Nicotiana tabacum L. (Solanaceae)
Jahnke, Simone M.;Redaelli, Luiza R.;Diefenbach, Lúcia M.G.;Efrom, Caio F.S.;
Neotropical Entomology , 2003, DOI: 10.1590/S1519-566X2003000100018
Abstract: the search for oviposition sites with good conditions for offspring development is common in many insect species. predators usually lay eggs in various places in a culture to allow a more complete colonization and to reduce intraspecific competition. this knowledge is important to determine the role of predators in the control of phytophagous populations. the present work aimed at characterizing cosmoclopius nigroannulatus st?l egg masses in tobacco field, and at identifying their spatial distribution pattern. a field with 270 tobacco plants (nicotiana tabacum, virginia type, var. k326), was surveyed from august 1999 to april 2000. the experimental field was located in porto alegre, rio grande do sul, brazil. each egg mass found had its position recorded in relation to the culture (coordinates), the plant vertical stratum (inferior, middle and apical) and plant structure (steam and leaf). after nymphal emergence, the corions were collected and brought to the laboratory to record the egg number/mass. a total of 176 egg masses were found in 34 sampling occasions. the egg masses dispersion pattern followed a random distribution in almost all occasions, considering both the dispersion index i (97%) and the taylor power law index (b = 0.9633). most of the eggs (68.4%) were found on the plant apical third. the adaxial leaf side was also preferred for oviposition. the mean number of eggs/mass was 13.1 ± 4.98, ranging from two to 22. the egg masses distribution pattern in the experimental plot suggests an adequate usage of the available resources.
Primeiro registro da ocorrência de Cirrospilus floridensis Evans (Hymenoptera) como parasitóide de Phyllocnistis citrella Stainton (Lepidoptera) no Brasil
Jahnke, Simone Mundstock;Redaelli, Luiza Rodrigues;Diefenbach, Lúcia Maria Guedes;
Ciência Rural , 2005, DOI: 10.1590/S0103-84782005000200035
Abstract: this study reports the first record of cirrospilus floridensis evans in brazil. this eulophidae was obtained from pupae of phyllocnistis citrella stainton (citrus-leafminer) present in infested leaves of the montenegrina variety (citrus deliciosa) and the hybrid tangor murcott (c. sinensis x c. reticulata) collected from july of 2001 to june of 2003 in montenegro, rs, brazil. adults, males and females of c. floridensis were registered.
Predation and parasitism of Cirrospilus neotropicus (Hymenoptera: Eulophidae) on Phyllocnistis citrella (Lepidoptera: Gracillariidae) in laboratory
FOELKEL,ESTER; RODRIGUES REDAELLI,LUIZA; MUNDSTOCK JAHNKE,SIMONE; BAERLE LOSEKANN,PAULA;
Revista Colombiana de Entomología , 2009,
Abstract: the predation and parasitism of cirrospilus neotropicus (hymenoptera: eulophidae) was evaluated on third instar phyllocnistis citrella (lepidoptera: gracillariidae) larvae reared on citrus limonia under controlled conditions (25 ± 1oc; l:d 12:12 h). two groups of parasitoid females were evaluated: one in which pupae were collected from citrus orchards (field females) at eldorado do sul, rs, brazil (30°29’s, 51°06’w), and the other from a laboratory colony (laboratory females). after mating, each female was maintained in an individual container and fed honey, pollen and 12 p. citrella every 48 hours. in both groups the behaviors of predation (host feeding), oviposition and superparasitism were observed. the average percent mortality caused by field females (48.71 ± 3.29%) was significantly higher than that caused by laboratory females (35.12 ± 3.45%)(h = 4.74; p = 0.01). mortality due to predation was 19.15 ± 1.75% in field females and 25.11 ± 3.82% in laboratory females, with no significant difference (h = 1.57; p = 0.21). the average percent parasitism without predation did not differ significantly between field (49.15 ± 2.89%) and laboratory females (42.33 ± 4.07%)(h = 0.53; p = 0.47). superparasitism represented 6.92 ± 1.21% of the total hosts killed by field females, and 3.51 ± 0.99% by laboratory females. the results show the influence of p. citrella in the death of c. neotropicus caused by parasitism and predation.
Predation and parasitism of Cirrospilus neotropicus (Hymenoptera: Eulophidae) on Phyllocnistis citrella (Lepidoptera: Gracillariidae) in laboratory Predación y parasitismo de Cirrospilus neotropicus (Hymenoptera: Eulophidae) en Phyllocnistis citrella (Lepidoptera: Gracillariidae) en laboratorio
ESTER FOELKEL,LUIZA RODRIGUES REDAELLI,SIMONE MUNDSTOCK JAHNKE,PAULA BAERLE LOSEKANN
Revista Colombiana de Entomología , 2009,
Abstract: The predation and parasitism of Cirrospilus neotropicus (Hymenoptera: Eulophidae) was evaluated on third instar Phyllocnistis citrella (Lepidoptera: Gracillariidae) larvae reared on Citrus limonia under controlled conditions (25 ± 1oC; L:D 12:12 h). Two groups of parasitoid females were evaluated: one in which pupae were collected from citrus orchards (field females) at Eldorado do Sul, RS, Brazil (30°29’S, 51°06’W), and the other from a laboratory colony (laboratory females). After mating, each female was maintained in an individual container and fed honey, pollen and 12 P. citrella every 48 hours. In both groups the behaviors of predation (host feeding), oviposition and superparasitism were observed. The average percent mortality caused by field females (48.71 ± 3.29%) was significantly higher than that caused by laboratory females (35.12 ± 3.45%)(H = 4.74; P = 0.01). Mortality due to predation was 19.15 ± 1.75% in field females and 25.11 ± 3.82% in laboratory females, with no significant difference (H = 1.57; P = 0.21). The average percent parasitism without predation did not differ significantly between field (49.15 ± 2.89%) and laboratory females (42.33 ± 4.07%)(H = 0.53; P = 0.47). Superparasitism represented 6.92 ± 1.21% of the total hosts killed by field females, and 3.51 ± 0.99% by laboratory females. The results show the influence of P. citrella in the death of C. neotropicus caused by parasitism and predation. Se evaluaron la depredación y parasitismo de Cirrospilus neotropicus (Hymenoptera: Eulophidae) sobre larvas del tercer instar de Phyllocnistis citrella (Lepidoptera: Gracillariidae) alimentadas con hojas de Citrus limonia en condiciones controladas (25 ± 1oC; L:D 12:12 h). Dos grupos de parasitoides hembras fueran evaluadas: uno en que las pupas se coleccionaron de pomar cítrico (hembras del campo) en Eldorado do Sul, RS, Brasil (30°29’S, 51°06’W), y el otro de un cría laboratorio (hembras de laboratorio). Después del apareamiento, se mantuvo cada hembra en un contenedor individual, alimentada con miel, polen y 12 larvas de P. citrella cada 48 horas. En los dos grupos se observaron los comportamientos de depredación, oviposición y superparasitismo. La porcentaje de mortalidad promedio causado por las hembras del campo (48,71 ± 3,29%) fue significativamente superior al de laboratorio (35,12 ± 3,45%) (H = 4,74; P = 0,01). La mortalidad debido a la depredación fue 19,15 ± 1,75% en las hembras de campo y 25,11 ± 3,82% en las de laboratorio, sin diferencia significativa (H = 1,57; P = 0,21). El porcentaje promedio de hospederos parasitados si
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