R. Almeida

Publications51
h-index23
Citations2,178
Highly Influential Citations170
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Cell-cell signaling controls Xylella fastidiosa interactions with both insects and plants.
TLDR
It is shown that a diffusible signal molecule is required for biofilm formation in the vector and for vector transmission to plants, and identified the genes regulated by rpfF, which are more virulent than the wild type when mechanically inoculated into plants.
Transmission of Xylella fastidiosa to Grapevines by Homalodisca coagulata (Hemiptera: Cicadellidae)
TLDR
In laboratory experiments, the major characteristics of H. coagulata’s transmission of X. fastidiosa to grapevines were the same as reported for other vectors: short or absent latent period; nymphs transmitted but lost infectivity after molting and regainedinfectivity after feeding on infected plants; and infectivity persisted in adults.
Use of a Green Fluorescent Strain for Analysis of Xylella fastidiosa Colonization of Vitis vinifera
TLDR
Evidence is presented for X. fastidiosa movement through bordered pits to neighboring vessels and proposed that vessel-to-vessel movement is a key colonization strategy whose failure results in vessel plugging and disease.
Biological Traits of Xylella fastidiosa Strains from Grapes and Almonds
TLDR
Test the hypothesis that ALS is caused by PD and ALS strains in the field and found that both groups of X. fastidiosa caused ALS and overwintered within almonds after mechanical inoculation.
Vector Transmission of Xylella fastidiosa: Applying Fundamental Knowledge to Generate Disease Management Strategies
TLDR
Basic aspects of X. fastidiosa transmission by vectors, the ecology of insects in relation to transmission and disease spread, and how basic research can be applied to the development of management strategies for a X.FastidiosA disease are discussed.
Transmission of grapevine leafroll-associated virus 3 by the vine mealybug (Planococcus ficus).
TLDR
Transmission parameters of GLRaV-3 by the vine mealybug showed that transmission of this virus occurs in a semipersistent manner and fills in important gaps in knowledge of leafroll virus transmission, which is critical for development of Leafroll disease management practices.
Host structural carbohydrate induces vector transmission of a bacterial plant pathogen
TLDR
Data show that host structural polysaccharides mediate gene regulation in X. fastidiosa, which results in phenotypic changes required for vector transmission of this pathogen, which may lead to previously undiscovered disease-control strategies.
Patterns of Xylella fastidiosa Colonization on the Precibarium of Sharpshooter Vectors Relative to Transmission to Plants
TLDR
The results suggest that sharpshooters introduce into plants X. fastidiosa cells that detach from the precibarial canal during feeding, which is similar to infective nymphs losing transmissibility after molting and no latent period is required for transmission.
Genome-Wide Analysis Provides Evidence on the Genetic Relatedness of the Emergent Xylella fastidiosa Genotype in Italy to Isolates from Central America.
TLDR
A comparative analysis based on single nucleotide polymorphisms and the study of the pan-genome of the 27 currently public available whole genome sequences of X. fastidiosa found the clustering and distinctiveness of the ST53 isolates supports the hypothesis of their common origin, and the limited genetic diversity among these isolates suggests this is an emerging clade within subsp.
Homalodisca coagulata (Hemiptera, Cicadellidae) Transmission of Xylella fastidiosa to Almond.
TLDR
It is found that, under laboratory conditions, H. coagulata acquired X. fastidiosa from symptomatic almond plants with low efficiency relative to grape, suggesting that low bacterial populations within almond are partially responsible for the lower acquisition rates observed from diseased almond compared with diseased grape.
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