Temporal Dynamics of Tomato Severe Rugose Virus and Bemisia tabaci in Tomato Fields in São Paulo, Brazil

2015 ◽  
Vol 164 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Júlio C. Barbosa ◽  
Jorge A. M. Rezende ◽  
Lilian Amorim ◽  
Armando Bergamin Filho
Keyword(s):  
Bemisia Tabaci ◽  
Temporal Dynamics ◽  
Sao Paulo ◽  
São Paulo

scholarly journals Only the B biotype of Bemisia tabaci is present on vegetables in São Paulo State, Brazil

2011 ◽  
Vol 68 (1) ◽  
pp. 120-123 ◽  
Author(s):  
Kelly Cristina Gonçales Rocha ◽  
Julio Massaharu Marubayashi ◽  
Jesús Navas-Castillo ◽  
Valdir Atsushi Yuki ◽  
Carlos Frederico Wilcken ◽  
...  
Keyword(s):  
Middle East ◽  
East Asia ◽  
Bemisia Tabaci ◽  
Solanum Melongena ◽  
Sao Paulo ◽  
Asia Minor ◽  
São Paulo ◽  
Solanum Lycopersicum L ◽  
Cryptic Species Complex ◽  
Biotype B

Bemisia tabaci (Genn.) is one of the most important pests in cultivated areas of vegetables and ornamental crops around the world. Based on the mitochondrial cytochrome oxidize I (mtCOI) sequence, there is evidence that B. tabaci should be considered a cryptic species complex of 11 groups containing 24 species. Two of the groups, Middle East-Asia Minor 1 and Mediterranean include biotypes B and Q, respectively. In this study we evaluated the mtCOI sequence of B. tabaci populations collected in sites of the state of São Paulo, Brazil. Using PCR-RFLP with Taq I, a typical biotype B profile was obtained for all specimens. Based on the comparison with mtCOI reference sequences we found four haplotypes all belonging to the Middle East-Asia Minor 1. They occurred in the hosts pepper (Capsicum annuum L.), tomato (Solanum lycopersicum L.), eggplant (Solanum melongena L.) and cucurbitaceae plants.

scholarly journals Space-temporal dynamics of limnological variables in a floodplain wetland located at Ribeira do Iguape Valley (São Paulo, Brazil) at different hydrological periods

2012 ◽  
Vol 24 (1) ◽  
pp. 83-96 ◽  
Author(s):  
Roseli Frederigi Benassi ◽  
Rogério Herlon Furtado Freire ◽  
Maria do Carmo Calijuri
Keyword(s):  
Temporal Dynamics ◽  
Principal Component ◽  
Inorganic Phosphorus ◽  
Sao Paulo ◽  
Total Alkalinity ◽  
São Paulo ◽  
Dissolved Phosphorus ◽  
Conservation Policies ◽  
Spatial Gradients ◽  
Physical And Chemical Variables

AIM: The main goal of this research was to investigate the influence of the hydrological pulses on the space-temporal dynamics of physical and chemical variables in a wetland adjacent to Jacupiranguinha River (São Paulo, Brazil); METHODS: Eleven sampling points were distributed among the wetland, a tributary by its left side and the adjacent river. Four samplings were carried out, covering the rainy and the dry periods. Measures of pH, dissolved oxygen, electrical conductivity and redox potential were taken in regular intervals of the water column using a multiparametric probe. Water samples were collected for the nitrogen and total phosphorus analysis, as well as their dissolved fractions (dissolved inorganic phosphorus, total dissolved phosphorus, ammoniacal nitrogen and nitrate). Total alkalinity and suspended solids were also quantified; RESULTS: The Multivariate Analysis of Variance showed the influence of the seasonality on the variability of the investigated variables, while the Principal Component Analysis gave rise in two statistical significant axes, which delimited two groups representative of the rainy and dry periods. Hydrological pulses from Jacupiranguinha River, besides contributing to the inputs of nutrients and sediments during the period of connectivity, accounted for the decrease in spatial gradients in the wetland. This "homogenization effect" was evidenced by the Cluster Analysis. The research also showed an industrial raw effluent as the main point source of phosphorus to the Jacupiranguinha River and, indirectly, to the wetland; CONCLUSIONS: Therefore, considering the scarcity of information about the wetlands in the study area, this research, besides contributing to the understanding of the influence of hydrological pulses on the investigated environmental variables, showed the need for adoption of conservation policies of these ecosystems face the increase anthropic pressures that they have been submitted, which may result in lack of their ecological, social and economic functions.

Natural Infection Rate of Known Tomato Chlorosis Virus-Susceptible Hosts and the Influence of the Host Plant on the Virus Relationship With Bemisia tabaci MEAM1

Plant Disease ◽  
2020 ◽  
Author(s):  
Arnaldo Esquivel-Fariña ◽  
Jorge Alberto Marques Rezende ◽  
William M. Wintermantel ◽  
Laura Jenkins Hladky ◽  
Daiana Bampi
Keyword(s):  
Infection Rate ◽  
Bemisia Tabaci ◽  
Host Plants ◽  
Natural Infection ◽  
Sao Paulo ◽  
Cultivated Plants ◽  
São Paulo ◽  
Susceptible Host ◽  
External Sources ◽  
Tomato Chlorosis Virus

Tomato chlorosis virus (ToCV; genus Crinivirus, family Closteroviridae) was identified in tomato crops in the state of São Paulo, Brazil in 2006. Management strategies to control external sources of inoculum are necessary, because chemical control of the whitefly vector Bemisia tabaci MEAM1 has not efficiently prevented virus infections and no commercial tomato cultivars or hybrids are resistant to this crinivirus. We first evaluated the natural infection rate of some known wild and cultivated ToCV-susceptible hosts and their attractiveness for B. tabaci MEAM1 oviposition. Physalis angulata was the most susceptible to natural infection in all six exposures in 2018 and 2019. No plants of Capsicum annuum (cv. Dahra) or Chenopodium album became infected. Solanum melongena (cv. Napoli) had only two infected plants of 60 exposed. C. annuum and C. album were the least preferred, and Nicotiana tabacum and S. melongena were the most preferred for whitefly oviposition. In addition, from 2016 to 2019, we surveyed different tomato crops and the surrounding vegetation to identify ToCV in weeds and cultivated plants in the region of Sumaré, São Paulo state. Only Solanum americanum, vila vila (S. sisymbriifolium) and C. album were found naturally infected, with incidences of 18%, 20% and 1.4%, respectively. Finally, we estimated the ToCV titer (isolates ToCV-FL, USA and ToCV-SP, Brazil) by RT-qPCR in different ToCV-susceptible host plants and evaluated the relationship between virus acquisition and transmission by B. tabaci MEAM1. The results clearly showed significant differences in ToCV concentrations in the tissues of ToCV-susceptible host plants, which appeared to be influenced by the virus isolate. The concentration of the virus in plant tissues, in turn, directly influenced the ToCV-B. tabaci MEAM1 relationship and subsequent transmission to tomato plants. To minimize or prevent the damage from the tomato yellowing disease through management of external sources of ToCV, it is necessary to correctly identify the potentially important ToCV-susceptible hosts in the vicinity of new plantings.

scholarly journals Surtos populacionais de Bemisia tabaci no estado de São Paulo

Bragantia ◽  
1994 ◽  
Vol 53 (1) ◽  
pp. 53-59 ◽  
Author(s):  
André Luiz Lourenção ◽  
Hiroshi Nagai
Keyword(s):  
Bemisia Tabaci ◽  
Sao Paulo ◽  
Euphorbia Pulcherrima ◽  
São Paulo ◽  
Sonchus Oleraceus ◽  
De Se ◽  
Solanum Viarum ◽  
Sida Rhombifolia

A partir de 1991, tem sido observada a presença da mosca-branca Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae) em altas populações em hortaliças e orna-mentais nos municípios paulistas de Paulínia, Holambra, Jaguariúna e Artur Nogueira. Foram constatadas infestações severas em tomateiro, brócolos, berinjela e aboboreira; nesta última, o sintoma observado em plantas infestadas pela mosca-branca é o prateamento da face superior das folhas, em conjunto com queda drástica da produção. Uma lavoura de tomate severamente infestada por B. tabaci apresentava o sintoma referido colo amadurecimento irregular dos frutos do tomateiro; plantas invasoras presentes nessa área também foram intensamente colonizadas, principalmente Sida rhombifolia L., Sonchus oleraceus L., Solanum viarum Dun. e Ipomoea acuminata Roem. & Schult. Em Holambra, verificaram-se ataques intensos em plantas ornamentais, principalmente crisântemo (Chrysantemum morifolium Ramat.) e bico-de-papagaio (Euphorbia pulcherrima Willd.); roseiras foral pouco colonizadas. Nessas hortaliças e nas ornamentais, a aplicação quase diária de inseticidas não reduziu a infestação do inseto. Além dessas plantas, campos de algodão, em Holambra, e de feijão, em Paulínia, também foram infestados por B. tabaci. Nos E.U.A., a capacidade de certas populações de B. tabaci de induzir o prateamento da folha em aboboreira e de colonizar intensamente E. pulcherrima, entre outros fatores, têm levado à distinção do biótipo "B" ou "poinsétia", nome vulgar dessa euforbiácea; todavia, estudos recentes na Califórnia (E.U.A.) mostram a possibilidade de se tratar de duas espécies distintas. Dada a similaridade entre as infestações associadas a B. tabaci que vêm ocorrendo naquele país e, mais recentemente, no Brasil, é provável que o biótipo B ou essa nova espécie tenha sido aqui introduzido.

scholarly journals Begomovírus infectando a cultura de pimentão no estado de São Paulo

2010 ◽  
Vol 36 (3) ◽  
pp. 244-247 ◽  
Author(s):  
Denise Nakada Nozaki ◽  
Renate Krause-Sakate ◽  
Marcelo Agenor Pavan
Keyword(s):  
Bemisia Tabaci ◽  
Sao Paulo ◽  
Yellow Vein ◽  
Streak Virus ◽  
São Paulo

Vírus do gênero Begomovirus são transmitidos por mosca-branca Bemisia tabaci G., e constituem um dos problemas fitossanitários sérios em diversas culturas. Plantas de pimentão coletadas em oito regiões do Estado de São Paulo, foram submetidas a extração de DNA total e PCR com primers universais e degenerados para begomovírus, que amplificam parte da região codificadora para a proteína capsicial. Os dados indicam a presença de begomovírus em pimentão nas cinco regiões coletadas. Análise das seqüências do DNA viral e análise filogenética revelaram identidade com dois begomovírus nativo da América. Tomato severe rugose virus - ToSRV (AY029750) e com Tomato yellow vein streak virus (ToYVSV, AY829113), espécies descritas infectando tomateiro no Brasil. A presença de begomovírus em pimentão foi verificada nas regiões de Alvinlândia, Ubirajara, Botucatu, Elias-Fausto, Paulínia, Mogi Guaçu, Paranapanema e Pirajú.

Temporal Progress of Huanglongbing Epidemics and the Effect of Non-commercial Inoculum Sources on Citrus Orchards in São Paulo State, Brazil

Plant Disease ◽  
2021 ◽  
Author(s):  
Kelly Pazolini ◽  
Josicléa H. Arruda ◽  
Gressa A Chinelato ◽  
Armando Bergamin-Filho ◽  
José Belasque Junior
Keyword(s):  
Preventive Measures ◽  
Temporal Dynamics ◽  
Gompertz Model ◽  
Sao Paulo ◽  
P Value ◽  
São Paulo ◽  
Property A ◽  
Associated Bacteria ◽  
Paulo State ◽  
São Paulo State

Huanglongbing (HLB) incidence is increasing and threatening citrus production in São Paulo State, Brazil, despite multiple efforts to control the disease and its vector, the Asian citrus psyllid (ACP) (Diaphorina citri). The objective of this research was to study the temporal dynamics of HLB epidemics, under intensive disease management, in 177 individual commercial citrus blocks on a single property in São Paulo State. The effect of internal and external sources of HLB-associated bacteria and its vector were explored based on the disease epidemics and vector dynamics in the studied area. To manage HLB, the property owner used healthy nursery plants, eradicated symptomatic trees, and insecticides to control ACP. Logistic and Gompertz models were fitted to the data to describe dynamics of HLB incidence for all blocks. The average ACP per yellow sticky trap was determined for the same blocks for a period of four consecutive years. Both logistic and Gompertz models described the HLB epidemics well, although the Gompertz model provided a slightly better fit. Disease progress rates, HLB incidences and average ACP per trap in the 177 blocks were low compared with reports in the literature. HLB incidence and number of ACP per trap were higher (p-value ≤0.05) in part of citrus blocks located around the edge of the property. A large number of non-commercial trees was found near the property and are a potential primary inoculum source of HLB-associated bacteria, accounting for the higher incidence of HLB and ACP per trap in blocks located closest to the property´s edge. These results support the recommended preventive measures to HLB management and the necessity of external actions, to include trees in commercial orchards, and non-commercial trees located near commercial citrus properties, in an attempt to maximize the effectiveness of these preventive measures.

scholarly journals Syphilis in Pregnant Women and Congenital Syphilis: Spatio-temporal Dynamics and Covariates in the Middle-income Country – São Paulo, Brazil

2021 ◽  
Author(s):  
Joelma Alexandra Ruberti ◽  
Mellina Yamamura ◽  
Zilda Pereira da Silva ◽  
Carmen Silvia Bruniera Domingues ◽  
Eliseu Alves Waldman ◽  
...  
Keyword(s):  
Pregnant Women ◽  
Teenage Pregnancy ◽  
Temporal Dynamics ◽  
Congenital Syphilis ◽  
Secondary Data ◽  
Sao Paulo ◽  
São Paulo ◽  
En Bloc ◽  
Middle Income ◽  
Continuous Increase

Abstract We aimed to estimate the occurrence of syphilis in pregnant women (SPW) and congenital syphilis (CS) in the municipalities of the state of São Paulo (SP) and evaluate their relationship with socioeconomic, demographic, and health care variables. We developed an ecological study based on secondary data of SPW and CS with spatial and temporal components from 645 municipalities in SP and included data from 2007 to 2018. We modeled the data in a Bayesian context, considered spatial and temporal random effects, and used a binomial negative probability distribution. We found a continuous increase in the relative temporal risk of SPW, from 2007 to 2018, and CS, from 2007 to 2017, when their incidences increased by 8.7 and 6.6 times, respectively. Moreover, this increase occurred in en bloc in practically all municipalities of SP. The increase in SPW was associated with teenage pregnancy, municipalities with a large number of inhabitants, and aids incidence. The increase in CS was associated with municipalities with a large number of inhabitants, incomplete antenatal care, inadequate technology to perform deliveries in the municipality, and aids incidence. Interventions to control these diseases are needed in almost all the municipalities of the SP.

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