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| Registros recuperados: 145 | |
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| Christoffoleti,P.J.; Caetano,R.S.X.. |
| The goal of this literature review is to discuss some of the major aspects of the soil seed bank, from its characteristics down to methodological aspects of its determination. Soil seed bank is the reservoir of viable seeds or of vegetative propagules that are present in the soil and that are able to recompose a natural vegetation. In the agroecossystems the soil seed bank is related to weeds, and the knowledge of its size and composition in terms of species can be used in the prediction of future infestations, to built simulation models of population establishment through time and also the definition of soil and cultural management programs, in order to have a rational use of herbicides. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weed; Soil seed bank; Population dynamics. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500013 |
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| Kornsiri Srinil; Nootjarin Jungkhun; Tarapron Yuenyong; Kuntera Kanta; Antika Tonmit; Netnapa Pumhan. |
| Study about the accordance of rice insect pests from the light trap and the research data of insects in the rice seed of San-pah-tawng 1 (weak) and that of SuphanBuri 1 (resistant) was conducted from the year 2011 to 2013 at the Chiang Rai Rice Research Center. It’s found that the rice insect pests entrapped by the light trap being increased from the year 2007 to 2010. That in May, 2011, 4,779 zigzag leafhoppers were mostly found; in March, 2012, 19,248 whitebacked planthoppers were mostly found and; in May, 2013, 19,047 zigzag leafhoppers were mostly found. In the paddy field, rice insect pests were found in the rice seed of San-pah-tawng 1 more than that of Suphan Buri 1. In the In-season rice of the year 2011, the White backed planthoppers were mostly... |
| Tipo: PhysicalObject |
Palavras-chave: Whitebacked planthoppers; Brown planthoppers; Light trap; Climatic change; Rice; Sanpatong 1 variety; Suphanburi variety; Weak variety; Resistant variety; Insect pest; Natural enemies; Survey; Damage; Population dynamics; Chiangrai province; เพลี้ยกระโดดหลังขาว; เพลี้ยกระโดดสีน้ำตาล; ข้าว; พันธุ์สันป่าตอง 1; พันธุ์สุพรรณบุรี 1; พันธุ์อ่อนแอ; พันธุ์ต้านทาน; การสำรวจแมลงศัตรูพืช; กับดักแสงไฟ; การเปลี่ยนแปลงสภาพภูมิอากาศ; ภาวะโลกร้อน; การทำลายของแมลงศัตรูพืช; การประเมินความเสียหาย; การทำลายของแมลงศัตรูพืช; จ.เชียงราย. |
| Ano: 2014 |
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5696 |
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| Silva,Gisele B.; Zambolim,Laércio; Prabhu,Anne S.; Araújo,Leila G.; Zimmermann,Francisco J.P.. |
| The phenotypic diversity of Magnaporthe grisea was evaluated based on leaf samples with blast lesions collected from eight commercial fields of the upland rice cultivars 'BRS Primavera' and 'BRS Bonança', during the growing seasons of 2001/2002 and 2002/2003, in Goias State. The number of M. grisea isolates from each field utilized for virulence testing varied from 28 to 47. Three different indices were used based on reaction type in the eight standard international differentials and eight Brazilian differentials. The M. grisea subpopulations of ´Primavera' and 'Bonança', as measured by Simpson, Shannon and Gleason indices, showed similar phenotypic diversities. The Simpson index was more sensitive relation than those of Shannon and Gleason for pathotype... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Pyricularia grisea; Population dynamics; Rice blast; Pathotypes; Virulence. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582007000100001 |
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| Gomes,Gilmar S.; Huang,Shiou P.; Cares,Juvenil E.. |
| Temporal (monthly in three fields for 12 months) and spatial (once in 23 fields during March-April) samplings were conducted in the major soybean (Glycine max)-growing region of the Brazilian Federal District. Fifty-three nematode genera were found in both samplings, but 13 were detected only by the temporal sampling, and one only by the spatial sampling. Fifty-three percent were plant-parasites, 35% were bacterivores, and about 12% were fungivores, predators and omnivores constituted the community that was dominated by the genera Helicotylenchus (40% of total abundance), Acrobeles (15%), Cephalobus (7.6%), Meloidogyne(5.6%) and Pratylenchus (4.9%). Heterodera glycines was not found in this study. There were no differences in ten ecological measurements... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Population dynamics; Nematode ecology; Temporal and spatial samplings; Functional groups. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582003000300006 |
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| Haddad,Maria A.; Nogueira Júnior,Miodeli. |
| The scyphozoan Phyllorhiza punctata von Lendenfeld, 1884 (Mastigiidae), known only from Indo-Pacific waters prior to the 1950s, is today found far from its original distribution, probably due to human activities. First seen in 1955 in Brazilian waters, medusae were found in southern and southeastern coasts, disappearing (at least as a medusa) in the early 1960's. Another population was found in the late 1990's, in the state of Bahia, and again in late 2001, many sightings were reported along the coasts of Paraná and Santa Catarina (25º20'S, 48º12'W to 27º26'S, 48º22'W). A large summer bloom, followed by decline and disappearance in winter and spring, occurs every year since then. The reasons for this recent mass occurrence are unknown. Despite few... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Introduced species; Jellyfish; Population dynamics; Seasonal. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752006000300030 |
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| Picanço,Marcelo; Casali,Vicente Wagner Dias; Oliveira,Ivênio Rubens de; Leite,Germano Leão Demolin. |
| The Hymenoptera fauna associated to Solanum gilo was studied. There were 21 species of Hymenoptera from eight families. It was observed Homalotylus flaminus (Dalman, 1820) (Encyrtidae) parasiting the adults of Cycloneda sanguinea Linnaeus, 1763 (Coleoptera, Coccinellidae) and Chalcididae parasiting caterpillars of Mechanitis pofymnia casabranca Haensch, 1905 (Lepidoptera, Nymphalidae, Ithomiinae, Sthomiinae). Vespidae were observed preying both M. pofymnia casabranca and Diabrotica speciosa Germar, 1824 (Coleoptera, Chrysomelidae) adults. Halictidae, Andrenidae and Anthophoridae, were observed visiting flowers and Trigona spinipes (Fabricius, 1793) (Apidae) attacking fruits and stem ápices. The most abundant Hymenoptera were Formicidae; Cremalogaster sp.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; Entomofauna; Population dynamics; Protocooperation. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000400006 |
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| Silva,Alexandre de Almeida e; Varanda,Elenice Mouro; Rassini,Joaquim Bartolomeu. |
| It is important to understand the effects of weather, insect density and plant cultivar on insect abundance to predict and prevent crop production loss. The present work investigated the influence of such factors on aphid in alfalfa during one year (short term). Data was collected from September/1997 to August/1998 at Canchin Farm (CCPSE-EMBRAPA), São Carlos, State of São Paulo, Brazil. Weather conditions had, in general, little effect on the variation of aphid populations, but Therioaphis maculata abundance was negatively correlated to humidity. Moreover, high maximum temperatures and low levels of rainfall possible favored T. maculata high abundance on Crioula and P3 cultivars. Therefore, appropriate management of this species is required during hot and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbivory; Hemiptera; Medicago sativa; Resistance; Population dynamics. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052007000200012 |
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| Registros recuperados: 145 | |
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