A5054220914- Phytoplasmas and Hemiptera pathogens
- Cocoa and Sweet Potato Agronomy
- Plant Pathogenic Bacteria Studies
- Banana Cultivation and Research
- Plant Pathogens and Fungal Diseases
- Plant Virus Research Studies
- Insect-Plant Interactions and Control
- Plant Physiology and Cultivation Studies
- Insect symbiosis and bacterial influences
- Mosquito-borne diseases and control
- Plant pathogens and resistance mechanisms
- Horticultural and Viticultural Research
- Agricultural and Food Sciences
- Rural Development and Agriculture
- Leaf Properties and Growth Measurement
- Entomopathogenic Microorganisms in Pest Control
- Insect behavior and control techniques
- Plant and animal studies
- Plant Pathogens and Resistance
- Insect and Pesticide Research
- Nematode management and characterization studies
- Pineapple and bromelain studies
- Plant Disease Resistance and Genetics
- Mycorrhizal Fungi and Plant Interactions
- Growth and nutrition in plants
Fundo de Defesa da Citricultura
2014-2024
Agronomical Institute of Campinas
2023
Instituto de Biología Molecular y Celular de Plantas
2021
Consejo Superior de Investigaciones Científicas
2021
Universitat Politècnica de València
2021
University of California, Riverside
2014
Universidade de São Paulo
1998-2002
Citrus Huanglongbing, aka greening disease, has been the subject of several reviews in recent years. In this article, author presents a concise compilation main features and symptoms causal organisms vectors including impacts for Florida Brazil, two relatively new areas where disease discovered, as well implications California, Texas, Arizona citrus industries, which are threatened by close proximity to epidemic, rest western hemisphere. Accepted publication 19 June 2007. Published 6 September
Huanglongbing (HLB), caused by ‘Candidatus Liberibacter’ spp. and transmitted the Asian citrus psyllid Diaphorina citri (ACP), is an important threat to industries worldwide, causing significant yield loss. The current recommended strategies manage HLB are eliminate HLB-symptomatic trees reduce sources of bacterial inoculum apply insecticides vector populations. objective this study was assess effectiveness importance both applied within young plots (local management), in different...
In February 2007, sweet orange trees with characteristic symptoms of huanglongbing (HLB) were encountered in a region São Paulo state (SPs) hitherto free HLB. These tested negative for the three liberibacter species associated A polymerase chain reaction (PCR) product from symptomatic fruit columella DNA amplifications universal primers fD1/rP1 was cloned and sequenced. The corresponding agent found to have highest 16S rDNA sequence identity (99%) pigeon pea witches'-broom phytoplasma group...
The relationships between the net photosynthetic rate of bean leaves and severity rust, angular leaf spot anthracnose were quantified at different temperatures plant incubation, stages disease development, phenological crop, in two cultivars. Several experiments performed controlled environment chambers field. virtual lesion concept was used to quantify reduction efficiency green tissue surrounding lesions. β parameter that expressed ratio areas visual lesions estimated according model P x /...
Measurements related to gas exchange and chlorophyll fluorescence emission were taken from healthy diseased bean leaves with rust, angular leaf spot, anthracnose during lesion development for each disease. The experiments performed at different temperatures of plant incubation, using two cultivars. main effect temperature incubation was in disease development. There no significant difference between cultivars relation magnitude physiological alterations when severity the same cultivar. These...
Citrus sudden death (CSD), a new disease of unknown etiology that affects sweet orange grafted on Rangpur lime, was visually monitored for 14 months in 41 groves Brazil. Ordinary runs analysis CSD-symptomatic trees indicated departure from randomness symptomatic status among immediately adjacent mainly within rows. The binomial index dispersion (D) and the intraclass correlation (k) various quadrat sizes suggested aggregation almost all plots tested. Estimated parameters binary form Taylor's...
Despite technical improvements in the citrus chain and leadership orange production achieved past decades, premature fruit drop remains a major component of crop loss São Paulo state belt, largest sweet area world. The present study aimed to determine, during five consecutive seasons, impact diseases pests on belt.Fruit due main averaged approximately 11.0%, which corresponded 63% annual drop. average rate borer flies combined was 4.0%, Huanglongbing (HLB) 3.3%, black spot 2.6%, leprosis...
Guignardia citricarpa , the causal agent of citrus black spot, forms airborne ascospores on decomposing leaves and water‐spread conidia fruits, twigs. The spatial pattern diseased fruit in tree canopies was used to assess importance spot epidemics São Paulo State, Brazil. aggregation canopy quantified by binomial dispersion index ( D ) binary form Taylor's Power Law for 303 trees six groves. significantly greater than 1 251 trees. intercept regression line 0 slope not different from 1,...
Instituto Agronomico do Parana - IAPAR, 86001-970, Londrina, PR, BrasilAutor para correspondencia: Jose Belasque Junior, e-mail: belasque@fundecitrus.com.br1. IntroducaoHuanglongbing (HLB), ou Greening, e a doenca mais importante destrutiva da citricultura mundial (Bove, 2006; Gottwald et al., 2007a). Presente de forma endemica nos continentes asiatico africano ha varias decadas, essa foi recentemente detectada dois principais paises produtores citros, Brasil Estados Unidos (Colleta Filho...
Huanglongbing (HLB) is a devastating citrus disease worldwide. A three-pronged approach to controlling HLB has been suggested, namely, removal of HLB-symptomatic trees, psyllid control, and replacement with HLB-free trees. However, such strategy did not lead successful control in many citrus-producing regions, as Florida. We hypothesize that this because the small-scale or incomprehensive implementation program; conversely, comprehensive at regional level can successfully HLB. To test our...
Citrus Sudden Death (CSD), a new, graft-transmissible disease of sweet orange and mandarin trees grafted on Rangpur lime rootstock, was first seen in 1999 Brazil, where it is present the southern Triângulo Mineiro northwestern São Paulo State. The serious threat to citrus industry, as 85% 200 million State are lime. After showing general decline symptoms, affected suddenly collapse die, manner similar sour rootstock when by tristeza caused infection with virus (CTV). In tristeza-affected...
Uma escala diagramática, abrangendo os dois tipos prevalentes de sintomas mancha preta em frutos cítricos (Citrus spp.), dura e falsa melanose, foi desenvolvida para padronizar a avaliação da severidade doença. A elaborada considerando limites máximos mínimos doença observados no campo. Os valores intermediários seguiram incrementos logarítmicos do tipo (0,5; 1,7; 5,0; 11,5; 22,5 49,0%) melanose (1,1; 4,5; 15,0; 31,0; 53,0 68,0%). Para validação escala, seis avaliadores quantificaram partir...
ABSTRACT Eradication of Asiatic citrus canker (ACC) has become increasingly difficult over the last decade, following introduction Asian leafminer into Brazil and Florida, which led to changes in eradication protocols. The present study, undertaken Brazil, was aimed at characterizing spatial patterns ACC commercial plantings gain better understanding dynamics disease subsequent leafminer. were mapped 326 statistically assessed various dimensions. presence "within-group" aggregation each plot...
Two surveys (2005/2006 and 2009) were conducted in the state of São Paulo, Brazil, to investigate incidence ‘ Candidatus Liberibacter asiaticus’ Ca. L. americanus’, two liberibacters associated with citrus huanglongbing (HLB) disease both transmitted by Diaphorina citri , orange jasmine ( Murraya exotica ), a widespread ornamental tree cities villages. The graft‐transmissibility species, their DNA relatedness citrus‐associated liberibacters, also investigated. Quantitative PCR was applied...