First Report of Leaf Smut of Gaillardia × grandiflora Caused by Entyloma gaillardianum in North America

2010 ◽  
Vol 11 (1) ◽  
pp. 51 ◽  
Author(s):  
Dean A. Glawe ◽  
Tess Barlow ◽  
Steven T. Koike
Keyword(s):  
North America ◽  
Leaf Spot ◽  
Its Region ◽  
Morphological Features ◽  
Causal Agent ◽  
Leaf Spot Disease ◽  
First Report ◽  
Spot Disease ◽  
Leaf Smut

In the summer of 2009, a leaf spot disease occurred on 100% of Gaillardia × grandiflora cv. Goblin in a commercial nursery in coastal Monterey Co., CA. Nearly all of the affected plants were unsalable. The causal agent was determined to be Entyloma gaillardianum based on morphological features, host, and ITS region. This species has not been reported previously from this host in North America. Accepted for publication 16 March 2010. Published 28 April 2010.

scholarly journals First report of leaf spot disease caused by Stemphylium eturmiunum on garlic in Korea.

Plant Disease ◽  
2021 ◽  
Author(s):  
Walftor Dumin ◽  
Mi-Jeong Park ◽  
You-Kyoung Han ◽  
Yeong-Seok Bae ◽  
Jong-Han Park ◽  
...  
Keyword(s):  
Leaf Spot ◽  
Allium Sativum ◽  
Morphological Characteristics ◽  
Fungal Isolate ◽  
Causal Agent ◽  
Leaf Spot Disease ◽  
Pathogenicity Test ◽  
First Report ◽  
Spot Disease ◽  
Intact Leaves

Garlic (Allium sativum L. cv.namdo) is one of the most popular vegetables grown in Korea due to its high demand from the food industry. However, garlic is susceptible to a wide range of pest infestations and diseases that cause a significant decrease in garlic production, locally and globally (Schwartz and Mohan 2008). In early 2019, the occurrence of leaf blight disease was found spreading in garlic cultivation areas around Jeonnam (34.9671107, 126.4531825) province, Korea. Disease occurrence was estimated to affect 20% of the garlic plants and resulted in up to a 3-5% decrease in its total production. At the early stage of infection, disease symptoms were manifested as small, white-greyish spots with the occurrence of apical necrosis on garlic leaves. This necrosis was observed to enlarge, producing a water-soaked lesion before turning into a black-violet due to the formation of conidia. As the disease progressed, the infected leaves wilted, and the whole garlic plants eventually died. To identify the causal agent, symptomatic tissues (brown dried water-soak lesion) were excised, surface sterilized with 1% NaOCl and placed on the Potato Dextrose Agar (PDA) followed by incubation at 25°C in the dark for 5 days. Among ten fungal isolates obtained, four were selected for further analyses. On PDA, fungal colonies were initially greyish white in colour but gradually turned to yellowish-brown after 15 days due to the formation of yellow pigments. Conidia were muriform, brown in colour, oblong (almost round) with an average size of 18 – 22 × 16 – 20 μm (n = 50) and possessed 6 - 8 transverse septa. Fungal mycelia were branched, septate, and with smooth-walled hyphae. Morphological characteristics described above were consistent with the morphology of Stemphylium eturmiunum as reported by Simmons (Simmons, 2001). For molecular identification, molecular markers i.e. internal transcribed spacer (ITS) and calmodulin (cmdA) genes from the selected isolates were amplified and sequenced (White et al., 1990; Carbone and Kohn 1999). Alignment analysis shows that ITS and cmdA genes sequence is 100% identical among the four selected isolates. Therefore, representative isolate i.e. NIHHS 19-142 (KCTC56750) was selected for further analysis. BLASTN analysis showed that ITS (MW800165) and cmdA (LC601938) sequences of the representative isolates were 100% identical (523/523 bp and 410/410 bp) to the reference genes in Stemphylium eturmiunum isolated from Allium sativum in India (KU850545, KU850835) respectively (Woudenberg et al. 2017). Phylogenetic analysis of the concatenated sequence of ITS and cmdA genes confirmed NIHHS 19-142 isolates is Stemphylium eturmiunum. Pathogenicity test was performed using fungal isolate representative, NIHHS 19-142. Conidia suspension (1 × 106 conidia/µL) of the fungal isolate was inoculated on intact garlic leaves (two leaves from ten different individual plants were inoculated) and bulbs (ten bulbs were used) respectively. Inoculation on intact leaves was performed at NIHHS trial farm whereas inoculated bulbs were kept in the closed container to maintain humidity above 90% and incubated in the incubator chamber at 25°C. Result show that the formation of water-soaked symptoms at the inoculated site was observed at 14 dpi on intact leaves whereas 11 dpi on bulbs. As a control, conidia suspension was replaced with sterile water and the result shows no symptoms were observed on the control leaves and bulbs respectively. Re-identification of fungal colonies from symptomatic leaf and bulb was attempted. Result showed that the morphological characteristics and molecular marker sequences of the three colonies selected were identical to the original isolates thus fulfilled Koch’s postulates. Early identification of Stemphylium eturmiunum as a causal agent to leaf spot disease is crucial information to employ effective disease management strategies or agrochemical applications to control disease outbreaks in the field. Although Stemphylium eturmiunum has been reported to cause leaf spot of garlic disease in China, France and India (Woudenberg et al. 2017), to our knowledge, this is the first report of causing leaf spot disease on garlic in Korea.

scholarly journals First Report of Leaf Spot Disease of Pineapple Caused by Penicillium oxalicum 

Plant Disease ◽  
2021 ◽  
Author(s):  
Jingbo Wu ◽  
Yanbiao He ◽  
Renshu Chen
Keyword(s):  
Leaf Spot ◽  
Its Region ◽  
Ananas Comosus ◽  
Leaf Spot Disease ◽  
Post Inoculation ◽  
Sodium Hypochlorite Solution ◽  
Tropical Fruit ◽  
First Report ◽  
Leizhou Peninsula ◽  
Spot Disease

Pineapple (Ananas comosus Merr.) is an economically important tropical fruit crop. In China, it is primarily distributed in tropical and subtropical southern regions, including Leizhou Peninsula (Guangdong province) and Hainan province. Other pineapple culturing areas also include Fujian, Guangxi, Yunnan, and Taiwan provinces.A pineapple leaf spot disease was observed in Leizhou Peninsula (N20°47′52″,E 110°5′7″) from July to August in 2019–2020, with a natural incidence of 10 to 15%. In the initial infection stage, grayish or yellowish white spots emerged on the leaf surfaces with dimensions 1.25–1.75 × 0.8–1.0 cm. The leaf spots also had distinctive light brown-to-reddish brown banding pattern on the edges. At the late stage of infection, the leaves with the spots withered and died, seriously affecting the plant growth. To isolate the pathogen, leaf pieces 5 mm in diameter were cut from the decaying edges. They were surface-sterilized with 75% ethanol solution for 30 s, washed with 0.1% sodium hypochlorite solution for 30 s, rinsed five times with sterile water, and placed on potato dextrose agar (PDA) medium. After incubation at 28°C for 6 days, the pathogen was purified using single conidial isolation for morphological and molecular characterization. All 25 isolates showed similar phenotypes. The colonies on PDA were green, circular, flat, and velutinous. Conidiophores were broom-shaped (16.35±1.30 μm). Conidia were colorless, unicellular, and kidney shaped (3.50–4.00 × 2.50–3.00 μm). Based on the morphological characteristics, the fungal isolates were tentatively identified as Penicillium species. From each culture, the internal transcribed spacer (ITS) region of rDNA and the partial β-tubulin genes of a representative isolate (ZN2019211) were amplified using ITS1/ITS4 and Bt2a/Bt2b primer pairs, respectively. The gene sequences were deposited in GenBank (accessions MT678576 for the ITS region and MT720907 for the Bt2 region) and were 100% identical to P. oxalicum Currie & Thom isolates (MN592913 for the ITS region; KX961250 for the Bt2 region). Based on their morphological and molecular characteristics, the isolates were determined to be P. oxalicum. Pathogenicity tests were conducted in three replicates by inoculating surface-sterilized leaves of pineapple. The leaves were wounded and inoculated with mycelium PDA plugs (10 × 10 mm) from 6-day-old cultures. Control leaves wounded in the same way were inoculated with sterilized PDA plugs (10 × 10 mm). Each of the three replicates comprised two whole plants and two leaves (including a control) per plant (Wu et al. 2016). The inoculated leaves were placed in a greenhouse (25 to 30°C). Six days post inoculation, symptoms similar to those observed in the field were observed on the inoculated leaves, but not on the controls; the same fungus was isolated both times from the infected leaves, confirming Koch’s postulates. We also inoculated pineapple inflorescence and fruit, with or without injury, and observed that the pathogen could not cause pineapple fruit disease, but caused early senescence of the inflorescence after being dropped with 200 µl of a 104 conidia/ml solution, although it did not affect subsequent flowering. P. oxalicum has been reported to cause blue mold disease in different plants (Paul et al. 2018; Liu et al. 2019; Tang et al. 2020; Picos-Munoz et al. 2011). However, to the best of our knowledge, this is the first report of pineapple leaf spot disease caused by P. oxalicum globally, and the disease has become a potential threat to the growth and production of pineapple in China.

scholarly journals First Report of Leaf Spot Caused by Alternaria alternata on Chinese Dwarf Banana in China

Plant Disease ◽  
2014 ◽  
Vol 98 (5) ◽  
pp. 691-691 ◽  
Author(s):  
B. Z. Fu ◽  
Z. H. Zhang ◽  
L. H. Wang ◽  
G. Y. Li ◽  
J. Z. Zhang ◽  
...  
Keyword(s):  
Alternaria Alternata ◽  
Leaf Spot ◽  
Morphological Characteristics ◽  
Pcr Amplification ◽  
Its Region ◽  
Leaf Spot Disease ◽  
First Report ◽  
Spot Disease ◽  
Rdna Its ◽  
Its Sequence Analysis

The Chinese dwarf banana (Ensete lasiocarpum) is one of the ornamental bananas that belongs to Musaceae family. The plant is native to the southwestern China, where it grows semi-wild in the mountains between 1,500 and 2,500 m above sea level. During July 2011, a leaf spot disease on this plant was observed in the campus and parks in Kunming, Yunnan Province. The incidence level was about 22%, mainly on the old leaves. The leaf symptoms were irregular spots with gray to off-white centers surrounded by dark brown margins, and usually also surrounded by chlorotic halos. Leaf tissues (3 × 5 mm), cut from the margins of lesions, were surface-disinfected (95% ethanol for 3 min, 0.1% HgCl2 for 2 min, rinsed three times with sterile water), plated on potato sucrose agar (PSA), and incubated at 26°C under natural lights. The same fungus was consistently isolated from the diseased leaves. Colonies of white-to-dark gray mycelia formed on PSA that were black on the underside. The colonies were further identified as Alternaria sp. based on the dark brown, obclavate to obpyriform catenulate conidia with longitudinal and transverse septa tapering to a prominent beak attached in chains on a simple and short conidiophore (2). Conidia were 5.26 to 30.26 μm long and 3.95 to 15.79 μm wide, averaging 10.21 (±3.17) × 20.02 (±5.75) μm (n = 50), with a beak length of 0 to 7.89 μm, and had 3 to 8 transverse and 0 to 3 longitudinal septa. PCR amplification was carried out by utilizing universal rDNA-ITS primer pair ITS4/ITS5 (1). The ITS region of isolate DY1 (GenBank Accession No. KF516556) was 572 bp in length. BLAST search revealed 99% identity with two Alternaria alternata isolates (JF440581.1 and GQ121322.2). Phylogenetic analysis (MEGA 5.1) using the neighbor-joining algorithm placed the isolate in a well-supported cluster with other A. alternata isolates. The pathogen was identified as A. alternate (Fr.:Fr.) Keissler based on the morphological characteristics and rDNA-ITS sequence analysis. To confirm pathogenicity, Koch's postulates were performed on detached leaves of E. lasiocarpum inoculated with mycelial plugs with ddH2O and agar plugs as a control. Leaf spots identical to those observed in the field developed in 9 days on the inoculated leaves but not on the control. The inoculation assay used three leaves, totaling 72 spots for control and 36 spots for inoculation. The experiments were repeated once. A. alternata was consistently re-isolated from the inoculated leaves. The symptom developed easier with wounds. To our knowledge, this is the first report of E. lasiocarpum leaf spot disease caused by A. alternata in China and the world. References: (1) T. J. White et al. Page 315 in: PCR Protocols: A Guide to Methods and Applications. Academic Press, San Diego, 1990. (2) T. Y. Zhang. Flora Fungorum Sinicorum, Vol. 16: Alternaria. Science Press, Beijing, China, 2003.

scholarly journals The First Report of Calonectria Pteridis Causing a Leaf Spot Disease on Serenoa repens in China

Plant Disease ◽  
2014 ◽  
Vol 98 (6) ◽  
pp. 854-854
Author(s):  
W. Yang ◽  
L. Zheng ◽  
C. Wang ◽  
C.-P. Xie
Keyword(s):  
Leaf Spot ◽  
Morphological Characteristics ◽  
Its Region ◽  
Leaf Spot Disease ◽  
Fluorescent Light ◽  
Brown Pigment ◽  
Morphological Identification ◽  
Serenoa Repens ◽  
First Report ◽  
Spot Disease

Serenoa repens [(Bartr) J. K. Small] is an important medicinal plant with their extracts is one of the three most effective drugs to cure benign prostatic hyperplasia (BPH). Also it can be used as an ornamental plant for garden. In November 2010, a new leaf spot disease was found on S. repens in Danzhou, Hainan Province, China. Disease occurred very seriously, with the incidence close or up to 100%, even leading to plant drying and death. Initially, the leaves had circular water-soaked dots, and had an obvious yellow halo on the edge, then expanded into oval, circular, or irregular shaped spots. Eventually the spot was beige and gray in the center and dark brown and slightly concave on the edge. The pathogen was isolated following the method reported by Fang (3) and prepared for further characterization. On potato dextrose agar (PDA) medium, the pathogen formed round and red-brown colonies with neat edges of a sandy beige color. A white powdery substance was formed on the surface of the colony, and it produced reddish-brown pigment on the back. On carnation leaf agar (CLA), only large macroconidium was observed. Macroconidiophores containing a stipe bearing penicillate suites of fertile branches, terminating in a clavate vesicle (5.9-) 6.4 (-6.9) × (33.8-) 39.6 (-46.7) μm. Conidiogenous apparatus had primary branches aseptate or rarely 1-septate and were (21.8-) 28.7 (-38.6) μm long, secondary branches were aseptate and (18.8-) 29.9 (-39.9) μm long, and tertiary branches were aseptate and (14.2-) 17.4 (-19.9) μm long. Macroconidium and microconidium were observed on water agar (WA) at 30 days. Macroconidium was colorless, cylindrical, rounded at both ends, 1 to 3 hyaline septate, but mainly one, and (4.5-) 5.2 (-6.2) × (71.3-) 84.1 (-98.0) μm; microconidium was colorless, cylindrical, both ends obtuse, curved or straight, 1-septate, and (24.8-) 33.2 (-45.2) × (2.5-) 3.5 (-5.0) μm. It could produce microsclerotia on PDA, CLA, and WA media. Morphological characteristics of the specimen examined were similar to Calonectria pteridis. In the genus of Calonectria, only C. pteridis could produce bending microconidium on WA medium (2). To confirm the morphological identification, primer pair ITS1/ITS4 were used for amplification of the ITS region of rDNA. Its sequence (GenBank Accession No. KF994926) showed 99% identity with C. pteridis Crous, M.J. Wingf. & Alfenas. (GQ280617.1). In addition, the translation elongation factor 1-alpha gene sequence was amplified (KF994927) and it showed 100% identify with C. pteridis (FJ918564.1) (1). Thus, the pathogen was identified as C. pteridis. To confirm pathogenicity, conidial suspensions (105 conidia ml−1) of the pathogen were inoculated with healthy leaves of 10 plants by pinprick inoculation method. Control plants were inoculated with water. Plants were maintained at 28°C in a greenhouse with constant humidity (RH 90%) and a 12-h photoperiod of fluorescent light. Symptoms similar to the original ones appeared after 7 days, while the control plants remained healthy. The tests were repeated three times and the pathogen was re-isolated from the leaves of inoculated plants and confirmed to be C. pteridis by both morphology and molecular characterization. To our knowledge, this is the first report of leaf spot caused by C. pteridis on S. repens in China. References: (1) I. Carbone and L. M. Kohn. Mycologia 91:553, 1999. (2) P. W. Crous and M. J. Wingfield. Mycotaxon 51:341, 1994. (3) Z. D. Fang. Plant Disease Research Methods, 3rd edition. China Agriculture Press, Beijing, 1998.

scholarly journals First Report of Leaf Spot Disease in Coconut Seedling Caused by Bipolaris setariae in China

Plant Disease ◽  
2014 ◽  
Vol 98 (12) ◽  
pp. 1742-1742 ◽  
Author(s):  
X.-Q. Niu ◽  
F.-Y. Yu ◽  
H. Zhu ◽  
W.-Q. Qin
Keyword(s):  
Leaf Spot ◽  
Sequence Similarity ◽  
Cocos Nucifera ◽  
Morphological Characteristics ◽  
Aerial Mycelium ◽  
Its Region ◽  
Leaf Spot Disease ◽  
First Report ◽  
Spot Disease ◽  
Cocos Nucifera L

Coconut (Cocos nucifera L.), an important oilseed as well as a multipurpose perennial plantation crop, is distributed and planted in humid tropical areas. In October 2012, a new leaf spot disease was observed on 3-year-old coconut seedlings in Wenchang, Hainan Province, China. The symptom first appeared as spindly or elliptical and brown flecks with water-soaked lesions that became yellow with the progress of the disease. In the later stage of the disease, the lesions merged together, gradually expanding to the leaf apex. In recent years, the disease has been prevalent in all the nursery gardens surveyed. Once young leaves got infected and nearly all the leaves of the tree showed diseased symptoms, the coconut eventually became defoliated. The pathogen was isolated from the lesion margin, surface sterilized with 75% ethanol and 0.1% mercury bichloride, washed by sterile distilled water, and then placed excising pieces of leaves from the leision margin onto potato dextrose agar (PDA). Plates were incubated at 25°C for 4 days. After 7 days, the colony was grayish black and produced black pigment in the medium. Aerial mycelium was fluffy, septate, and branched, the conidiophores were slightly flexuous or straight, 5 to 11 μm thick, and produced curved, spindle-shaped, or fusiform, septate conidia with 4 to 10 septa, measuring 39 to 86 × 9 to 16 μm, with a slightly protuberant hilum, truncated. Based on the symptoms and mycelial and conidial characters above, the fungus was identified as Bipolaris setariae (1). The pathogenicity was established and repeated for six times by following Koch's postulates. Two 1-year-old coconut seedlings were washed with sterilized water and six leaves were wounded with a sterile needle and then inoculated by spraying them with a suspension of conidia of the isolate. The seedlings were kept in two incubators at 25°C for 12 days. Inoculated leaves showed typical symptoms similar to those described above. The pathogen was re-isolated from inoculated leaves. Morphological characteristics were identical to the original isolated fungus. In contrast, the control leaves did not show any symptoms. The genomic DNA of this fungus was extracted, amplification of the internal transcribed spacer (ITS) region was performed with primer ITS1 and ITS4, and the purified PCR product was sequenced (GenBank Accession No. KJ605157). BLASTn analysis revealed 99% sequence similarity with four B. setariae isolates (HE792936.1, JX462256, GU073108.1, and FJ606786.1). Morphologic characters and sequence analysis of the ITS rDNA confirmed that the pathogen was B. setariae. Bipolaris incurvata has been reported causing disease on coconut (2), but B. setariae was not previously reported on coconut. So far, this is the first report of B. setariae caused coconut seedling leaf spot disease in Hainan, China. References: (1) K. C. da Cunha et al. J. Clin. Microbiol. 50:4061, 2012. (2) A. Kamalakannan et al. New Dis. Rep. 12:18, 2005.

scholarly journals First Report of Leaf Spot Caused by Septoria erigerontis on Erigeron strigosus in Korea

Plant Disease ◽  
2012 ◽  
Vol 96 (12) ◽  
pp. 1827-1827
Author(s):  
J. H. Park ◽  
K. S. Han ◽  
S. H. Hong ◽  
H. D. Shin
Keyword(s):  
North America ◽  
Leaf Spot ◽  
Morphological Characteristics ◽  
Its Region ◽  
The United States ◽  
Culture Collection ◽  
Leaf Spot Disease ◽  
Conidial Suspension ◽  
Voucher Specimen ◽  
First Report

Erigeron strigosus Muhl. ex Willd., known as daisy fleabane, is native to North America and was accidently introduced to Korea in the 1990s (2). It is increasingly invasive in natural and managed ecosystems throughout Korea. In June 2011, a leaf spot was first observed on daisy fleabanes growing wild in Hongcheon County of Korea. A voucher specimen was deposited in the Korea University Herbarium (KUS-F25759). Symptoms developed on lower leaves as small, distinct, reddish brown lesions, which enlarged progressively and turned into pale, dull brown spots surrounded by dark purplish-brown margins. Black pycnidia became visible in the lesions. Pycnidia were epigenous, occasionally hypogenous, scattered, dark brown to rusty brown, globose, embedded in host tissue or partly erumpent, 60 to 160 μm in diameter, with ostioles measuring 10 to 30 μm in diameter. Conidia were straight to mildly curved or even flexuous, guttulate, hyaline, 30 to 75 × 1.5 to 2 μm, and one- to seven-septate. Based on the morphological characteristics, the fungus was consistent with Septoria erigerontis Peck (3,4). Conidia were harvested from cirrhi of pycnidia on leaf lesions with a drop of sterile water and then directly streaked onto water agar media using a bacterial loop. Isolates were incubated at 24°C for 48 h. Germinating conidia were individually transferred to potato dextrose agar (PDA) plates. An isolate was deposited in the Korean Agricultural Culture Collection (Accession No. KACC46120). Genomic DNA was extracted using the DNeasy Plant Mini DNA Extraction Kit (Qiagen Inc., Valencia, CA). The internal transcribed spacer (ITS) region of rDNA was amplified using the ITS1/ITS4 primers and sequenced. The resulting sequence of 505 bp was deposited in GenBank (Accession No. JX480493). A GenBank BLAST search was conducted with the 505-bp sequence showing 100% identity with the sequences of S. erigerontis ex Erigeron annuus (EF535638, GU269862). Pathogenicity was tested by spraying leaves of three potted plants with a conidial suspension (2 × 105 conidia/ml) harvested from a 4-week-old PDA culture. Control leaves were sprayed with sterile distilled water. The plants were placed in a dew chamber at 26°C in darkness and continuous dew for the first 24 h and then moved to a greenhouse bench. After 7 days, leaf spot symptoms identical to those observed in the field developed on the leaves inoculated with the fungus. No symptoms were observed on control plants. S. erigerontis was reisolated from the lesions of inoculated plants, fulfilling Koch's postulates. A leaf spot disease of E. strigosus associated with S. erigerontis has been reported in the United States and Canada (1). To our knowledge, this is the first report of leaf spot on E. strigosus caused by S. erigerontis outside of North America as well as in Korea. References: (1) D. F. Farr and A. Y. Rossman. Fungal Databases. Syst. Mycol. Microbiol. Lab., Online publication. ARS, USDA, Retrieved June 2, 2012. (2) S. H. Park. Colored Illustrations of Naturalized Plants of Korea. Ilchokak Publishers, Seoul, Korea, 1995. (3) M. J. Priest. Fungi of Australia: Septoria. ABRS/CSIRO Publishing, Melbourne, Australia, 1997. (4) E. Radulescu et al. Septoriozele din Romania. Ed. Acad. Rep. Soc. Romania, Bucuresti, Romania, 1973.

TWO NEW SEVERE LEAF SPOT DISEASE ON FOREST TREES OF JALGAON (MAHARASTRA) INDIA

2017 ◽  
Vol 23 (2) ◽  
Author(s):  
S. A. FIRDOUSI
Keyword(s):  
Leaf Spot ◽  
Fungal Disease ◽  
Leaf Spot Disease ◽  
Forest Trees ◽  
First Report ◽  
Spot Disease ◽  
Severe Leaf

During the survey of the forest fungal disease, of Jalgaon district, two severe leaf spot diseases on Lannae coromandelica and ( Ougenia dalbergioides (Papilionaceae) were observed in Jalgaon, forest during July to September 2016-17. The casual organism was identified as Stigmina lanneae and Phomopsis sp. respectively1-4,7. These are first report from Jalgaon and Maharashtra state.

scholarly journals First report of chick peach (Prunus persica L.) leaf spot disease caused by Didymella glomerata in China

2021 ◽  
Author(s):  
Yiping Cui ◽  
Aitian Peng ◽  
Xiaobing Song ◽  
Baoping Cheng ◽  
Jinfeng Ling ◽  
...  
Keyword(s):  
Leaf Spot ◽  
Prunus Persica ◽  
Leaf Spot Disease ◽  
First Report ◽  
Spot Disease

Mycosphaerella populorum. [Descriptions of Fungi and Bacteria].

1990 ◽  
Author(s):  
A. Sivanesan
Keyword(s):  
North America ◽  
South America ◽  
Geographical Distribution ◽  
Leaf Spot ◽  
Leaf Spot Disease ◽  
Distribution Map ◽  
Spot Disease ◽  
Mycosphaerella Populorum

Abstract A description is provided for Mycosphaerella populorum. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Populus spp. DISEASE: Septoria canker, leaf spot disease. GEOGRAPHICAL DISTRIBUTION: North America: USA (east and central states). South America: Argentina (CMI Distribution Map 540, 1981). TRANSMISSION: By windborne conidia and ascospores.

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