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Search Results: 1 - 10 of 651526 matches for " LúCIA M.G.; "
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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.
Ocorrência de Parasitismo em Ovos de Spartocera dentiventris (Berg) (Hemiptera: Coreidae) em Cultura de Fumo
Neotropical Entomology , 2001, DOI: 10.1590/S1519-566X2001000400033
Abstract: the paucity of information about egg parasitoids of spartocera dentiventris (berg) motivated the present work. this study aimed to determine the parasitoid species involved as well as to quantify the mortality caused by these natural enemies in field conditions. the investigation was carried out in a tobacco crop (cultivar virgínia, var. k-326) in porto alegre, rs. from december/97 to february/98, 20 egg masses of known age were left exposed to all causes of mortality for a period of 13 days. two species of parasitoids were found on eggs of s. dentiventris: gryon gallardoi (brethes) (hym.: scelionidae) and neorileya ashmeadi crawford (hym.: eurytomidae). from a total of 321 observed eggs, only 34.3% (110 eggs) originated nymphs of s. dentiventris. parasitism was the main mortality factor, killing 148 eggs (46.1%) from the total observed.
Parametros reprodutivos de Corecoris dentiventris Berg (Hemiptera: Coreidae) em cultura de fumo (Nicotiana tabacum)
Caldas, Ben-Hur C.;Redaelli, Luiza R.;Diefenbach, Lúcia M.G.;
Anais da Sociedade Entomológica do Brasil , 1999, DOI: 10.1590/S0301-80591999000400002
Abstract: information about corecoris dentiventris berg, is mostly restricted to adult morphology, host plants and injuries. the objective of the present investigation was to study some reproductive parameters of this species. the experiment was carried out in a tobacco culture (virginia type, var. k 326), in the experimental area of the departamento de fitossanidade of the universidade federal do rio grande do sul, in porto alegre, rs. the reproductive parameters were estimated from ten couples isolated in plants, protected by cages, and observed until their death. the following average values were found: eggs/female = 355.9; pre-oviposition period = 11.8 days; oviposition period = 48.61 days; adult longevity = 62.6 and 66.1 days, respectively, for males and females. the reproductive potencial was estimated as 2.0 x 104 descendents per female in tobacco crop.
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.
Ocorrência natural de Beauveria bassiana (Bals.) Vuill. em adultos hibernantes de Oebalus poecilus (Dallas) (Hemiptera: Pentatomidae)
Neotropical Entomology , 2002, DOI: 10.1590/S1519-566X2002000100021
Abstract: hibernating adults of oebalus poecilus (dallas) were collected from may to december of 2000, in a bamboo thicket located in eldorado do sul county (30o 02' s e 51o 23' w), rs. the fungi isolation was done from dead insects, which presented a white micelial growth, in pda culture medium. the pathogenicity of the isolate was tested in laboratory conditions using three concentrations of conidium suspension (5 x 105; 5 x 107; 1.25 x 109 conidia/ml). the fungus was identified as beauveria bassiana (bals.) vuill. and was deposited in a culture collection of entomopathogenic fungi in embrapa soja with access number bb353. the isolate was pathogenic in all concentrations, being the highest mortality (84.4%) recorded in 1.25 x 109 conídios/ml concentration. this is the first record of this fungus on o. poecillus, in natural conditions.
Notes on age determination, growth and measurements of Brown Hyaenas Hyaena Brunnea from the Kalahari Gemsbok National Park
M.G.L Mills
Koedoe : African Protected Area Conservation and Science , 1982, DOI: 10.4102/koedoe.v25i1.604
Abstract: Brown hyaenas were aged on the basis of tooth eruption and wear and five age-classes were recognised. Weights and seven different body measurements were recorded from 38 immobilised hyaenas. Full size is reached at the age of 30 months, but age-class 5 animals were significantly lighter than were animals from the other adult age-classes. This was probably due to the worn down premolars of old animals resulting in less efficient bone chewing. With a few puzzling exceptions the sizes of brown hyaenas from different parts of their distribution range are similar.
Conservation management of large carnivores in Africa
M.G.L. Mills
Koedoe : African Protected Area Conservation and Science , 1991, DOI: 10.4102/koedoe.v34i1.417
Abstract: The conservation management of large carnivores in Africa is reviewed. In large protected areas the complexity of the relations between predators and prey, and between competing predators, indicate that these relationships should not be disturbed, even though, superficially, there may seem to be sound reasons to do so. Management action, however, may have to be taken against carnivores that break out of reserves. The related questions of translocation and re-introduction are also complex. Guidelines for considering whether to and how to implement these strategies are presented. It is stressed that adequate follow-up observations should be made after translocating or re- introducing carnivores, so that more information on the success of these strategies can be obtained. Much of Africa comprises rural areas inhabited by pastoralists. It may be possible to manage some large carnivore species in these areas to the mutual benefit of man and beast, but for this type of program to be successful, a well planned public relations campaign is essential.
Notes on wild dog Lycaon pictus and lion Panthera leo population trends during a drought in the Kruger National Park
M.G.L. Mills
Koedoe : African Protected Area Conservation and Science , 1995, DOI: 10.4102/koedoe.v38i1.309
Abstract: Wild dog Lycaon pictus and lion Panthera leo populations in the Kruger National Park appeared to undergo an increase during a drought period in the early 1990s. Newly established packs, high adult survival and pup productivity contributed to an increase in the wild dog population and evidence for high predation success during the height of the drought is presented. An increase in the lion density between 1989 and 1993 on the northern basalt plains, as well as changes in the structure of the population, seem to be related to changes in prey populations, particularly to a decline in numbers and condition of buffalo Syncerus cafer.
Salinization risk assessment in irrigated alluvium areas of semi-arid regions
Montenegro Suzana M.G.L.
Anais da Academia Brasileira de Ciências , 2000,
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