scholarly journals Registro de Leptocybe invasa no estado de Goiás

2014 ◽  
Vol 44 (10) ◽  
pp. 1721-1724
Author(s):  
Jaqueline Magalhães Pereira ◽  
Aniela Pilar Campos de Melo ◽  
Ohana Daroszewki Rodrigues ◽  
Thaíse Karla Ribeiro Dias ◽  
Carlos Frederico Wilcken

Registra-se a primeira ocorrência de Leptocybe invasa Fisher & La Salle (Hymenoptera: Eulophidae) no estado de Goiás em Eucalyptus grandis Hill ex Maiden. A detecção ocorreu no município de Goiânia.

2020 ◽  
Vol 61 (7) ◽  
pp. 1285-1296
Author(s):  
Lorraine Mhoswa ◽  
Marja M O’Neill ◽  
Makobatjatji M Mphahlele ◽  
Caryn N Oates ◽  
Kitt G Payn ◽  
...  

Abstract The galling insect, Leptocybe invasa, causes significant losses in plantations of various Eucalyptus species and hybrids, threatening its economic viability. We applied a genome-wide association study (GWAS) to identify single-nucleotide polymorphism (SNP) markers associated with resistance to L. invasa. A total of 563 insect-challenged Eucalyptus grandis trees, from 61 half-sib families, were genotyped using the EUChip60K SNP chip, and we identified 15,445 informative SNP markers in the test population. Multi-locus mixed-model (MLMM) analysis identified 35 SNP markers putatively associated with resistance to L. invasa based on four discreet classes of insect damage scores: (0) not infested, (1) infested showing evidence of oviposition but no gall development, (2) infested with galls on leaves, midribs or petioles and (3) stunting and lethal gall formation. MLMM analysis identified three associated genomic regions on chromosomes 3, 7 and 8 jointly explaining 17.6% of the total phenotypic variation. SNP analysis of a validation population of 494 E. grandis trees confirmed seven SNP markers that were also detected in the initial association analysis. Based on transcriptome profiles of resistant and susceptible genotypes from an independent experiment, we identified several putative candidate genes in associated genomic loci including Nucleotide-binding ARC- domain (NB-ARC) and toll-interleukin-1-receptor-Nucleotide binding signal- Leucine rich repeat (TIR-NBS-LRR) genes. Our results suggest that Leptocybe resistance in E. grandis may be influenced by a few large-effect loci in combination with minor effect loci segregating in our test and validation populations.


2015 ◽  
Vol 50 (2) ◽  
pp. 141-151 ◽  
Author(s):  
Ana M. Gonzalez ◽  
Stella M. Solís

: Leptocybe invasa o “avispa de la agalla del eucalipto”, es un microhimenóptero gallícola que ovipone en hojas jóvenes de eucaliptos. La planta responde formando agallas, que causan enrollamiento, defoliación y colapso de brotes, afectando seriamente la producción. En este trabajo se analizan los cambios morfogenéticos y anatómicos provocados por el desarrollo de las agallas, comparándolos con plantas sanas. Con técnicas tradicionales de microscopía óptica y electrónica de barrido se estudiaron ejemplares de Eucalyptus grandis y E. camaldulensis, cultivados en Corrientes, Argentina. La avispa ovipone entre los haces vasculares, el vegetal produce un tejido hiperplásico que se diferencia en cuatro estratos: nutricio, esclerosado, tanífero y cristalífero. El recorrido de los tejidos vasculares se obstruye, produciéndose “bucles xilemáticos” que interrumpen el flujo normal de agua y fotosintatos. Analizando los cambios morfológicos y anatómicos, junto al desarrollo del insecto, se divide el ciclo en tres etapas. Este trabajo demuestra que la formación de agallas en Eucalyptus representa un excelente ejemplo de fenotipo extendido, donde la acción de L. invasa induce al crecimiento anormal de los tejidos vegetales, tanto en aumento del número de células, colapso del sistema vascular de la zona afectada y aparición de nuevas características anatómicas.


2018 ◽  
Vol 28 (4) ◽  
pp. 1770
Author(s):  
Leonardo Rodrigues Barbosa ◽  
Angelo Peruffo Rodrigues ◽  
Amanda Rodrigues de Souza ◽  
Barbara De Oliveira Puretz ◽  
Carlos Frederico Wilcken ◽  
...  

A vespa-da-galha, Leptocybe invasa Fisher & La Salle (Hymenoptera: Eulophidae), originária da Austrália, pode danificar severamente plantas de eucalipto (Myrtaceae). Este inseto foi registrado em mudas de Eucalyptus grandis em maio de 2015 no município de Treze de Maio, Estado de Santa Catarina, Brasil.


2011 ◽  
Vol 17 (1) ◽  
pp. 73-77
Author(s):  
Jiujin XIAO ◽  
Jian ZHANG ◽  
Yumei HUANG ◽  
Hongxing MA ◽  
Xudong LI

Holzforschung ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Edgar V.M. Carrasco ◽  
Rejane C. Alves ◽  
Mônica A. Smits ◽  
Vinnicius D. Pizzol ◽  
Ana Lucia C. Oliveira ◽  
...  

Abstract The non-destructive wave propagation technique is used to estimate the wood’s modulus of elasticity. The propagation speed of ultrasonic waves is influenced by some factors, among them: the type of transducer used in the test, the form of coupling and the sensitivity of the transducers. The objective of the study was to evaluate the influence of the contact pressure of the transducers on the ultrasonic speed. Ninety-eight tests were carried out on specimens of the species Eucalyptus grandis, with dimensions of 120 × 120 × 50 mm. The calibration of the pressure exerted by the transducer was controlled by a pressure gauge using a previously calibrated load cell. The robust statistical analysis allowed to validate the experimental results and to obtain consistent conclusions. The results showed that the wave propagation speed is not influenced by the pressure exerted by the transducer.


2021 ◽  
Vol 170 ◽  
pp. 375-389
Author(s):  
Alexandra Cemin ◽  
Fabrício Ferrarini ◽  
Matheus Poletto ◽  
Luis R. Bonetto ◽  
Jordana Bortoluz ◽  
...  

New Forests ◽  
2021 ◽  
Author(s):  
Linnan Ouyang ◽  
Roger J. Arnold ◽  
Shaoxiong Chen ◽  
Yaojian Xie ◽  
Shae He ◽  
...  

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