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| Registros recuperados: 206 | |
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| Goussain,Marcio M.; Prado,Ernesto; Moraes,Jair C.. |
| The effect of silicon-treated wheat plants (Triticum aestivum L.) on the greenbug, Schizaphis graminum (Rond.) (Hemiptera: Aphididae) was evaluated. Plants were treated with silicon incorporated to the soil and by foliar spraying. Aphid development was evaluated by observing the duration of the pre-reproductive, reproductive and post-reproductive periods, as well as fecundity and longevity. Probing behaviour was investigated by using the DC electrical penetration graphs (EPG) technique and a "honeydew clock". Silica treated plants had a clear adverse effect on aphid development. Stylet penetration was not affected by treatments showing no physical barriers by the plant tissue. However, stylet was withdrawn more often on plants treated with silica,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; Resistance; Honeydew; Biology; EPG. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2005000500013 |
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| Santana,SWJ; Barros,R; Torres,JB; Gondim Jr,MGC. |
| Rearing Technique and Biological Traits of Atheloca subrufella (Hulst) (Lepidoptera: Phycitidae) in Coconut Fruits. Larvae of the coconut moth Atheloca subrufella (Hulst) develop in flowers and fruits of coconut, Cocos nucifera, causing precocious abscission of these structures and, hence, yield decrease. This work studied a feasible and suitable rearing technique for A. subrufella using fruits of coconut. We first determined the appropriate density of larvae to be reared per coconut fruit (among two, three, four or five larvae) and later tested the suitability of this rearing technique for three successive generations. The storage of egg and pupal stages during 0, 5, 10 and 20 days was also studied at 12ºC. Based on the fertility life table parameters,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biology; Fertility life table; Insect storage. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000100002 |
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| Gondim Jr.,Manoel G.C.; Moraes,Gilberto J. de. |
| Eriophyoid mites are commonly associated to palm trees, although few of them have been reported causing economic damage to those plants. One exception is Retracrus johnstoni Keifer, a pest of Bactris gasipaes Kunth, plant used for palm heart production. R. jonhstoni is frequently found in large numbers on Arecaceae in southeast Brazil. The biology of this mite was studied under laboratory condition. Sections of leaves of the palm tree Syagrus romanzoffiana (Cham.) Glassman, with ca. 15 leaflets, were kept alive by maintaining their bases in distilled water. Ca. 20 field collected adults of R. johnstoni were transferred onto each leaflet for oviposition. After 24h, mites were removed, leaving only one egg laid. Once a day, the eggs and the subsequent stages... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biology; Eriophyoidea; Arecaceae. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2003000200002 |
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| Santos-Cividanes,TM; Anjos,ACR dos; Cividanes,FJ; Dias,PC. |
| The lady beetle Coleomegilla maculata (De Geer) is a natural enemy of several insect pests and feeds on pollen and nectar to survive periods when prey is scarce. The effect of the feeding interval on the development, survival, fecundity, and longevity of C. maculata was determined. Newly hatched larvae of C. maculata were reared individually and fed with eggs of the Mediterranean flour moth Anagasta kuehniella (Zeller) at intervals of one, two, and three days under controlled conditions (23 ± 1ºC; 60 ± 10% RH; 12 h phtophase). The duration of larval instars and the total larval stage was prolonged as the feeding interval increased. The larval period lasted on average 9.2 ± 0.19 days when the larvae were fed daily with prey, and 14.6 ± 0.48 days when food... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biology; Biological control; Lady beetle; Predator; Prey availability. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2011000100017 |
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| Rylander, M.K.; Köster, F.. |
| During a 3 week study, a total of 55 individuals of the redlip blenny (Ophioblennius atlanticus) were observed for at least two 15-minute periods, and several for ten of such periods. The sizes of their territories were estimated, the color pattern of each specimen an intra and interspecific interactions were recorded. The mean territory size of the redlip blenny in the study area appeared to be greater than that of these blennies studied in Curacao and Barbados by NURSALL (1977), the difference reflecting perhaps different methods of identifying the territories or a lower density of O. atlanticus in the Santa Marta área. Territories did not appear to be as consistently defended at the study area as at Barbados/Curacao and our impression ¡s that... |
| Tipo: Journal Contribution |
Palavras-chave: Fisheries; Biology; Fisheries; Biology; Http://aims.fao.org/aos/agrovoc/c_2934; Http://aims.fao.org/aos/agrovoc/c_925. |
| Ano: 1982 |
URL: http://hdl.handle.net/1834/3965 |
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| Cano Mallo, M.. |
| El objetivo de esta tesis es caracterizar las poblaciones naturales de Ulva fasciata en el sector comprendido entre los ríos Quibú y Jaimanitas al oeste de La Habana, típico de costas de emersión del Caribe Occidental, con vistas a su posible explotación. El estudio se realizó entre marzo de 1996 y enero del 2001. Los resultados más importantes permitieron comprobar que la especie U. fasciata no se distribuye de forma similar en todo este sector, en la cobertura algal intervienen de manera decisiva, el tipo de sustrato y la disponibilidad de nutrientes en el medio. Los compuestos del nitrógeno y el fósforo en el agua de mar y las diferencias en la amplitud de variación de los mismos, justifican las diferencias en la morfometría, la biomasa en pie y el... |
| Tipo: Theses and Dissertations |
Palavras-chave: Algae; Biology; Algae; Biology; Http://aims.fao.org/aos/agrovoc/c_258; Http://aims.fao.org/aos/agrovoc/c_925. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/3404 |
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| Soliman, M.K.; Mohamed, S.G.; El-Gohary, M.S.; Khalil, R.H.; El-Banna, S.. |
| The effect of metrifonate on the immunity of the exposed fish are evaluated through the determination of the antibody titer and mortality rate during the challenge trial. In the chronic toxic exposure to metrifonate by dose 0.17mg/liter for 8 weeks, the more clear signs were darkness of fish color with hemorrhagic patches & loosing of scale at end of the trial the color return to normal. Determination of some blood parameters revealed significant decrease of white blood cell count, as there were lymphopenia and nueutrophilia during the chronic exposure to metrifonate. Phagocytic assay revealed a significant decrease in both phagocytic activity (PA) and phagocytic index(PI).Hypoproteinami hypoglobulinaemia and hypoalbuminaemia were observed. The... |
| Tipo: Journal Contribution |
Palavras-chave: Biology; Immunology; Biology; Http://aims.fao.org/aos/agrovoc/c_925. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1218 |
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| Derbali, Abdelkarim. |
| The pearl oyster Pinctada radiata and the cockle Cerastoderma glaucum are among the most abundant bivalve molluscs in southern Tunisian waters. These species are not currently subject to any investigation despite their important economic value in the world. For this reason, their biological parameters, their spatial distribution and their stock assessment were undertaken in the Gulf of Gabes. The reproductive cycle was studied in relation to variations of the environment parameters. The specimens were collected monthly during one year (2007) in sites of El Kraten and El Jorf (Kerkennah Islands) for the first species and sites of Sidi Mansour and El Hicha (North of Sfax and Gabes) for the second. An intraspecific polymorphism biometric trait for P. radiata... |
| Tipo: Theses and Dissertations |
Palavras-chave: Abundance; Biology; Shellfish. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/5404 |
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| Registros recuperados: 206 | |
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