Screening of <scp>C</scp>orymbia and <scp>E</scp>ucalyptus species for resistance to <scp>C</scp>alonectria pteridis leaf blight

Alfenas, Rafael Ferreira; Freitas, Rodrigo G.; Pereira, Olinto Liparini; Coutinho, Marcelo M.; Zarpelon, Talyta G.; Cândido, T. S.; Alfenas, Acelino C.

doi:10.1111/efp.12222

Cited by 18 publications

(10 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pathogenicity assays, using different concentrations of conidia, have been used to study Calonectria that produce large numbers of conidia (Alfenas et al, 2016; Graça et al, 2009). However, for many Calonectria species, few or no conidia are produced in culture.…”

Section: Discussionmentioning

confidence: 99%

Pathogenicity of six Calonectria species isolated from five soil layers in a Eucalyptus plantation

Liu

Chen

2022

Journal of Phytopathology

View full text Add to dashboard Cite

The genus Calonectria includes species that are pathogens of many plants. Calonectria leaf blight is a serious threat to Eucalyptus plantations in China and elsewhere in the world. Some Calonectria recovered from the surface layer (<20 cm) of soils can cause typical leaf blight symptoms on Eucalyptus trees. However, pathogenicity tests of Calonectria species from deeper soil layers have not been conducted. We tested the pathogenicity of 42 isolates of Calonectria aconidialis, C. chinensis, C. hongkongensis, C. ilicicola, C. kyotensis and C. orientalis obtained from 0–20, 20–40, 40–60, 60–80 and 80–100 cm soil layers in one Eucalyptus plantation in southern China. All the Calonectria isolates were pathogenic to two Eucalyptus genotypes. For isolates of the same Calonectria species from different soil layers, there was no evidence of correlation between their pathogenicity and soil depth. The pathogenicity of some isolates found in deeper soil layers was stronger than isolates in shallower soil layers. This may increase the challenges of controlling the diseases caused by these fungi. This study performed the first pathogenicity test for C. chinensis, C. kyotensis and C. orientalis on plants, and the first pathogenicity test for C. ilicicola on Eucalyptus. Research results in this study helped to clarify the potential threats of Calonectria species in deeper soil layers posed to Eucalyptus plantations.

show abstract

Section: Discussionmentioning

confidence: 99%

Pathogenicity of six Calonectria species isolated from five soil layers in a Eucalyptus plantation

Liu

Chen

2022

Journal of Phytopathology

View full text Add to dashboard Cite

show abstract

“…This isolate is highly aggressive to eucalypt and has been used in the evaluation of resistance of Corymbia, Eucalyptus species and hybrids (Alfenas et al, 2016;Zarpelon et al, 2015). Disks from the monospore culture of the fungus were transferred to Petri dishes containing ODA medium (7% oat, 2% dextrose and 2% agar).…”

Section: Inoculum Preparationmentioning

confidence: 99%

Phosphorus, nitrogen and potassium nutrition on Calonectria leaf blight in eucalypt plants

et al. 2019

View full text Add to dashboard Cite

Calonectria pteridis causes Calonectria leaf blight (CLB), and consequently severe defoliation in eucalypt plantations, which results in losses in wood volume. To reduce the negative impacts of this disease in eucalypt, this study aimed to assess the application of different doses and combinations of the macronutrients N, P and K on the percentage of symptomatic leaf area (SLA) and defoliation induced by the pathogen. Cuttings of a clone of Eucalyptus grandis were transplanted to pots containing soil that received different dose combinations of N, P and K, according to an incomplete factorial design. At 200 days after transplanting, leaf samples were analysed for N, P and K contents, and then, the plants were inoculated. Forty‐five days post‐inoculation, SLA and percentage of defoliation were quantified. Potassium doses above 75 mg/dm3 of soil significantly reduced SLA and defoliation. The influence of N and P on defoliation was dependent on K doses, but both reduced symptomatic leaf area. The best control of the disease, expressed by decreased defoliation and symptomatic leaf area, was achieved with leaf content of N, P and K of 9.8, 0.8 and 10.4 g per kg leaf, respectively, obtained with doses of 55, 82.5 and 143 mg/dm3of soil, respectively. Therefore, N, P and K nutrition can be a component of an integrated management programme for the control of CLB in eucalypts.

show abstract

“…(Zauza, Alfenas, Harrington, & Silva, ) and Calonectria pteridis Crous, M. J. Wingf. & Alfenas (Alfenas et al, ). These observations suggest that long‐term interspecific breeding in eucalypts may have caused them to have a broad genetic base, leading to high genetic variability (Caixeta, Carvalho, Rosado, & Trugilho, ; Guimarães et al, ).…”

Section: Discussionmentioning

confidence: 99%

Host range ofErwinia psidiiand genetic resistance ofEucalyptusandCorymbiaspecies to this pathogen

Caires

Hermenegildo²,

Guimarães

et al. 2019

Forest Pathology

View full text Add to dashboard Cite

Dieback caused by Erwinia psidii is currently one of the most important emerging diseases in eucalypt plantations in Brazil. However, little is known in terms of the host range of this pathogen or the potential sources of resistance against the disease it causes. In this study, we inoculated plants of species from nine families to gain insight into the host range of E. psidii. Plants of all inoculated species of Myrtaceae except Acca sellowiana exhibited disease symptoms and therefore represent potential hosts for the pathogen under natural conditions. In addition, the response of four Corymbia species, 29 Eucalyptus species and three interspecific Eucalyptus hybrids to inoculation with E. psidii was evaluated. All Corymbia henryi, Corymbia maculata, Eucalyptus thozetiana, Eucalyptus cloeziana, Eucalyptus viminalis, Eucalyptus dalrympleana and Eucalyptus pilularis plants were highly resistant to the pathogen, whereas differential disease resistance was observed in the other species. This study provides important information on sources of resistance to Erwinia psidii with potential use in the development of clones with enhanced resistance in eucalypt species of economic importance.

show abstract

Screening of Corymbia and Eucalyptus species for resistance to Calonectria pteridis leaf blight

Cited by 18 publications

References 17 publications

Pathogenicity of six Calonectria species isolated from five soil layers in a Eucalyptus plantation

Pathogenicity of six Calonectria species isolated from five soil layers in a Eucalyptus plantation

Phosphorus, nitrogen and potassium nutrition on Calonectria leaf blight in eucalypt plants

Host range ofErwinia psidiiand genetic resistance ofEucalyptusandCorymbiaspecies to this pathogen

Contact Info

Product

Resources

About