Identification and pathogenicity of Calonectria pseudoreteaudii causing leaf blight of Eucalyptus––a new record for India

Bose, Ratnaboli; Banerjee, Sabyasachi; Negi, Nitika; Pandey, Amit; Bhandari, Maneesh S.; Pandey, Shailesh

doi:10.1016/j.pmpp.2022.101917

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…The mycelial plug method employed for the inoculation of E. urophylla leaves has showed the pathogenicity of the four Calonectria isolates, coinciding with the results of other studies where this method has been used to test Calonectria isolates that present a moderate or failed sporulation on the culture media (Bose, Banerjee, Negi, et al, 2022;) Also, visual variations were observed in terms of the pathogenicity among the Calonectria isolates, which coincides with the reported by , where they found that within the same Calonectria species, the pathogenicity of the isolates can be different.…”

Section: Speciessupporting

confidence: 81%

Molecular and morphological characterization of Calonectria quinqueramosa causing leaf blight on Eucalyptus urophylla in Brazil

Sánchez‐González

Soares

Zarpelon

et al. 2023

Journal of Phytopathology

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One of the most damaging diseases of Eucalyptus is Calonectria leaf blight, and it causes significant economic losses. In March 2021, symptoms of leaf blight disease were observed in a Eucalyptus commercial plantation in northeastern Brazil. The present study aimed to identify the causal agent based on morphological features, phylogenetic analyses and pathogenicity tests. Based on phylogenetic analyses of the cmdA, his3, tef1 and tub2 gene regions and morphological characteristics, the fungal isolates were identified as Calonectria quinqueramosa, and their pathogenicity to Eucalyptus urophylla was confirmed. The results of this study confirmed the importance of multi-locus phylogeny supported by morphological characteristics for the proper identification of Calonectria species. To the best of our knowledge, this study highlights the first report of C. quinqueramosa causing leaf blight on E. urophylla trees in northeastern Brazil. This information will be valuable to promote the development of disease management strategies and to lead the development of Eucalyptus genotypes with resistance to Calonectria.

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Section: Speciessupporting

confidence: 81%

Molecular and morphological characterization of Calonectria quinqueramosa causing leaf blight on Eucalyptus urophylla in Brazil

Sánchez‐González

Soares

Zarpelon

et al. 2023

Journal of Phytopathology

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“…Recently, Crous et al (2019) reported the association of 110 different genera including species with foliar disease symptoms of eucalypts and suggested the need for further investigations on their pathogenicity. Recent surveys conducted in northern India identified Calonectria cerciana (Bose et al, 2020), C. pseudoreteaudii (Bose et al, 2022) and Lasiodiplodia iraniensis (Negi et al, 2023) as emerging threats to Eucalyptus trees.…”

Section: Introductionmentioning

confidence: 99%

“…(2019) reported the association of 110 different genera including species with foliar disease symptoms of eucalypts and suggested the need for further investigations on their pathogenicity. Recent surveys conducted in northern India identified Calonectria cerciana (Bose et al., 2020), C. pseudoreteaudii (Bose et al., 2022) and Lasiodiplodia iraniensis (Negi et al., 2023) as emerging threats to Eucalyptus trees. In December 2022, symptoms of a severe leaf spot and blight disease were observed on Eucalyptus camaldulensis trees in Yamunanagar, Haryana, northern India (N 30°13.981″ E 77°21.304″, 278 m amsl).…”

Section: Introductionmentioning

confidence: 99%

Pseudoplagiostoma eucalypti: An emerging pathogen of Eucalyptus in northern India

Negi,

Ramkrishna,

Meena

et al. 2024

Forest Pathology

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In December 2022, a leaf spot and blight disease was observed in Eucalyptus plantations in northern India. Morphological features coupled with phylogenetic analysis of combined internal transcribed spacer (ITS), translation elongation factor 1‐alpha (tef1) and β‐tubulin (tub2) regions confirmed the association of Pseudoplagiostoma eucalypti with the disease symptoms. The pathogenicity of P. eucalypti was first proved on detached leaves of Eucalyptus camaldulensis and reconfirmed in glasshouse inoculation experiments. Finally, Koch's postulates were fulfilled by re‐isolating the pathogen from the inoculated leaves. This pathogen was first described in 1995 from the leaves of Eucalyptus spp. collected from southern India, and this study confirms its first serious occurrence after more than two decades in northern India. In addition, this is the first report on the polyphasic characterization of P. eucalypti from India.

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“…Calonectria species primarily infect the leaves of the middle and lower parts of Eucalyptus trees, resulting in water-soaked spots. Under high temperatures and humidity, the spots gradually develop into extended necrotic areas, eventually causing the whole leaves to become blighted and fall off [ 5 , 7 , 9 , 10 , 11 ]. These species also cause cutting rot, damping-off, stem rot, and leaf rot in Eucalyptus nurseries [ 5 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…These species also cause cutting rot, damping-off, stem rot, and leaf rot in Eucalyptus nurseries [ 5 , 11 ]. Eucalyptus leaf blight caused by Calonectria species also occurs in other countries, including Australia, Brazil, India, Indonesia, Malaysia, Thailand, and Vietnam [ 10 , 12 , 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Wide Distribution and Intraspecies Diversity in the Pathogenicity of Calonectria in Soil from Eucalyptus Plantations in Southern Guangxi of China

Wu,

Chen

2023

JoF

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Eucalyptus spp. are extensively cultivated in southern China because of their adaptability and versatile timber production. Calonectria leaf blight caused by Calonectria species is considered a major threat to Eucalyptus trees planted in China. The GuangXi Zhuang Autonomous Region is the provincial region with the largest distribution of Eucalyptus plantations in China. The present study aimed to expound the species diversity and pathogenicity of Calonectria isolates obtained from the soil of Eucalyptus plantations in GuangXi. A total of 188 Calonectria isolates were recovered from the soil located close to Eucalyptus trees, and the isolates were identified based on the DNA sequence comparisons of the four partial regions of the translation elongation factor 1-alpha (tef1), β-tubulin (tub2), calmodulin (cmdA), and histone H3 (his3) genes. The isolates were identified as Calonectria aconidialis (74.5%), C. hongkongensis (21.3%), C. pseudoreteaudii (2.1%), C. kyotensis (1.6%), and C. chinensis (0.5%). The inoculation results indicated that 40 isolates representing five Calonectria species were pathogenic to the three Eucalyptus genotypes. Two inoculated experiments consistently showed that the longest lesions were produced by the isolates of C. aconidialis. Some isolates of C. aconidialis, C. hongkongensis, and C. kyotensis produced significantly longer lesions than the positive controls, but not the isolates of C. pseudoreteaudii or C. chinensis. These results indicated that Calonectria isolated from the soil may pose a threat to Eucalyptus plantations. Some Calonectria isolates of the same species differed significantly in their virulence in the tested Eucalyptus genotypes. The resistance of different Eucalyptus genotypes to Calonectria isolates within the same species was inconsistent. The inoculation results in this study suggested that many Calonectria isolates in each species had different levels of pathogenicity, and many Eucalyptus genotypes need to be tested to select disease-resistant Eucalyptus genetic materials in the future. The results of the present study enhance our knowledge of species diversity and the potential damage caused by Calonectria in the soil of Eucalyptus plantations. Our results also provide new insights into the breeding of disease-resistant Eucalyptus genotypes for controlling Calonectria leaf blight in China in the future.

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Identification and pathogenicity of Calonectria pseudoreteaudii causing leaf blight of Eucalyptus––a new record for India

Cited by 11 publications

References 21 publications

Molecular and morphological characterization of Calonectria quinqueramosa causing leaf blight on Eucalyptus urophylla in Brazil

Molecular and morphological characterization of Calonectria quinqueramosa causing leaf blight on Eucalyptus urophylla in Brazil

Pseudoplagiostoma eucalypti: An emerging pathogen of Eucalyptus in northern India

Wide Distribution and Intraspecies Diversity in the Pathogenicity of Calonectria in Soil from Eucalyptus Plantations in Southern Guangxi of China

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