Intervention Thresholds for Aphis spiraecola (Hemiptera: Aphididae) on Citrus clementina

2006 ◽  
Vol 99 (4) ◽  
pp. 1273-1279
Author(s):  
A. HermosoDeMendoza ◽  
R. Arouni ◽  
B. Belliure ◽  
E. A. Carbonell ◽  
J. Pérez-Panadés
Keyword(s):  
Intervention Thresholds ◽  
Citrus Clementina ◽  
Aphis Spiraecola

Intervention Thresholds for Aphis spiraecola (Hemiptera: Aphididae) on Citrus clementina

2006 ◽  
Vol 99 (4) ◽  
pp. 1273-1279 ◽  
Author(s):  
A. Hermoso de Mendoza ◽  
R. Arouni ◽  
B. Belliure ◽  
E. A. Carbonell ◽  
J. Pérez-Panadés
Keyword(s):  
Intervention Thresholds ◽  
Citrus Clementina ◽  
Aphis Spiraecola

scholarly journals At-risk and intervention thresholds of occupational stress using a visual analogue scale

PLoS ONE ◽  
2017 ◽  
Vol 12 (6) ◽  
pp. e0178948 ◽  
Author(s):  
Frédéric Dutheil ◽  
Bruno Pereira ◽  
Farès Moustafa ◽  
Geraldine Naughton ◽  
François-Xavier Lesage ◽  
...  
Keyword(s):  
At Risk ◽  
Visual Analogue Scale ◽  
Occupational Stress ◽  
Analogue Scale ◽  
Intervention Thresholds

scholarly journals How to decide intervention thresholds based on FRAX in central south Chinese postmenopausal women

Endocrine ◽  
2013 ◽  
Vol 45 (2) ◽  
pp. 195-197 ◽  
Author(s):  
Zhimin Zhang ◽  
Yangna Ou ◽  
Zhifeng Sheng ◽  
Eryuan Liao
Keyword(s):  
Postmenopausal Women ◽  
Intervention Thresholds ◽  
Chinese Postmenopausal Women ◽  
Central South

scholarly journals FRAX- vs. T-score-based intervention thresholds for osteoporosis

2017 ◽  
Vol 28 (11) ◽  
pp. 3099-3105 ◽  
Author(s):  
H. Johansson ◽  
F. Azizieh ◽  
N. al Ali ◽  
T. Alessa ◽  
N. C. Harvey ◽  
...  
Keyword(s):  
Intervention Thresholds ◽  
T Score

scholarly journals Porta-enxertos para a tangerineira 'Michal' no Rio Grande do Sul

2008 ◽  
Vol 39 (5) ◽  
pp. 1374-1379 ◽  
Author(s):  
Eduardo Cesar Brugnara ◽  
Sergio Francisco Schwarz ◽  
Otto Carlos Koller ◽  
Renar João Bender ◽  
Roberto Luis Weiler ◽  
...  
Keyword(s):  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Citrus Clementina

A tangerineira 'Michal' (Citrus clementina x C. tangerina) poderá ser uma boa alternativa ao Rio Grande do Sul como cultivar copa para produção de frutos em época precoce. No entanto, há falta de informações sobre seu comportamento em cultivo nas condições ambientais desse Estado. O objetivo deste trabalho foi avaliar o desenvolvimento das plantas, a produção e a qualidade dos frutos da tangerineira 'Michal' enxertada sobre cinco porta-enxertos: citrangeiro 'Troyer', citrumeleiro 'Swingle', limoeiro 'Cravo', tangerineira 'Sunki' e trifoliata 'Flying Dragon', na Depressão Central do Rio Grande do Sul. Foram avaliados os seguintes parâmetros: a altura das plantas, a circunferência do tronco, a área de projeção da copa (APC), o número e a massa (MF) de frutos produzidos, a relação MF/APC (IP), o teor de sólidos solúveis totais (SST), a acidez total titulável (ATT) e a relação SST/ATT do suco, além do tamanho dos frutos e do rendimento de suco. O citrumeleiro 'Swingle' promoveu bom vigor, boa produção, bom IP, bons níveis de SST e de ATT da 'Michal', enquanto o limoeiro 'Cravo' conferiu bom vigor, boa produção, bom IP e bom tamanho dos frutos, ambos podendo ser indicados como porta-enxertos em pomares de tangerineira 'Michal'.

scholarly journals Towards a better understanding of the dynamics of Aphis spiraecola Patch (Homoptera: Aphididae) populations in commercial alpine yarrow fields

2010 ◽  
Vol 42 (2) ◽  
pp. 103 ◽  
Author(s):  
Zulfaidah Penata Gama ◽  
Pablo Morlacchi ◽  
Giuseppe Carlo Lozzia ◽  
Johann Baumgärtner ◽  
Anna Giorgi
Keyword(s):  
Natural Enemy ◽  
Distributed Delay ◽  
Structured Populations ◽  
Temperature Dependent ◽  
Optimum Sample Size ◽  
Aphis Spiraecola ◽  
Different Temperatures ◽  
Mechanistic Basis ◽  
Age Structured ◽  
Optimum Sample

The spatial distribution of Aphis spiraecola Patch was studied in two commercial yarrow fields located in the Swiss and Italian Alps and represented by Taylor’s (1961) power law. The respective parameters indicate a highly aggregated distribution and lead to a high optimum sample size of 400-500 plants in the design of a sampling program. Opportunities for reducing the sampling efforts are discussed. The infestation patterns were studied on the basis of Vansickle’s (1977) time varying distributed delay adequate for modelling the dynamics of age-structured populations. Published literature data were used to parametrize the functions representing the temperature-dependent duration and survival of the nymphal and adult stage. Likewise, literature data were available to obtain reliable estimates for the parameters of the fecundity function comprising the reproductive profile and the number of nymphs produced at different temperatures. The field data were used to parametrize the functions for wing formation and a compound mortality compromising the effects of plant senescence, stem cutting and natural enemies. The model satisfactorily represented the observed infestation patterns. However, there are opportunities for improving parameter estimation and validation. Moreover, the separation of the compound mortality into host plant and natural enemy effects would improve the mechanistic basis of the model and lead towards a tool that could be used to study bottom-up and top-down effects in the yarrow-aphid-natural enemy system.

scholarly journals Asymmetric Interaction between Aphis spiraecola and Toxoptera citricida on Sweet Orange Induced by Pre-Infestation

Insects ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 414
Author(s):  
Jing Gao ◽  
Steve Arthurs ◽  
Runqian Mao
Keyword(s):  
Gene Expression ◽  
Amino Acid ◽  
Survival Rate ◽  
Sweet Orange ◽  
Marker Gene ◽  
Phloem Sap ◽  
Adult Weight ◽  
Marker Gene Expression ◽  
Aphis Spiraecola ◽  
Toxoptera Citricida

Indirect interactions between herbivorous insects that share the same host have been focused on insects feeding on herbaceous plants, while few studies investigate similar interactions on woody plants. We investigated performance and feeding behavior of two citrus aphids, Aphis spiraecola Patch and Toxoptera citricida Kirkaldy, on sweet orange as affected by prior infestation of conspecifics and heterospecifics. Results showed that pre-infestation-induced interactions between A. spiraecola and T. citricida were asymmetric, with A. spiraecola gaining more fitness. In detail, pre-infestation by A. spiraecola decreased adult weight, enhanced survival rate and accelerated phloem sap acceptance of conspecifics. However, A. spiraecola pre-infestation did not affect performance or feeding behavior of T. citricida. In another infestation sequence, the pre-infestation of T. citricida did not affect conspecifics, but positively affected heterospecifics, indicated as a decreased pre-reproductive period, enhanced survival rate, adult weight, fecundity, and feeding efficiency, i.e., faster access and acceptance of phloem sap, and longer phloem sap ingestion duration. Furthermore, we found A. spiraecola pre-infestation enhanced amino acid concentration, amino acid to sugar ratio, activated salicylic acid and jasmonic acid marker gene expression, while T. citricida pre-infestation only depressed jasmonic acid marker gene expression. Changes in nutrient and phytohormone-dependent defense probably underlie the asymmetric effect.

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