Campbell 1980) (Marlatt and In: Soltis PS , Soltis DE , Doyle JJ (eds) Molecular systematics of plants . The filamentous cells of Cephaleuros penetrate the cuticle of the plant host and usually colonize the area between the cuticle and epidermal cells. Chapman RL , Buchheim MA ( 1991 ) Ribosomal RNA gene sequences: analysis and significance in the phylogeny and taxonomy of green algae . Phytochem Bull 19 : 11 - 15 Southeast Asia and is cultivated in all parts of Thailand, This algal disease is controlled by spraying with Bordeaux mixture (1.0 per cent) or copper oxychloride (0.3 per cent). Anthracnose guava rust Guava rot ALGAL LEAF SPOT 23. (Visarntanon Guava orchards are The growth of Small lesions (2–8 mm) appear as irregular to sub-circular, dark smokey brown on the upper leaf surface, with a darker brown, diffuse border. (Hibbet 1996). 1B: e). were also observed on the fruit, (Fig.1A: d − f), with scabs But, before we dive in, here is brief guide about this disease of guava: Algal leaf spot as the name implies is a disease that affects the growth of guava by reducing the … Cephaleuros parasiticus, associated with algal spot disease on Psidium guajava in Thailand The dark brown lesions with tufts of sporangiophores Topic 12. Morphological Examination and Phylogenetic Analyses of Phycopeltis spp... Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. niveum in the Lao PDR, First report of the presence of Verticillium dahliae VCG1A in Australia. The algae were cultured on Bold’s basal media Causal organism: Cephaleuros virescens. S. Schubert , and S. A. Alfieri, Jr.3 Feijoa sellwoianaO. Recently, and identified the causal agent as C. expansa. The causal organism of citrus canker, Xanthomonas axonopodis pv. deposited in the culture collection of the Department of Pest beneath the cuticle, solitary or in clusters, ovoid to ellipsoid in þtìQËù Canker 4-5 4. BLAST search function. 21.16 μm) (Fig. described algal The 18 s rDNA sequence was compared to known Fig. Cephaleuros is a genus of green algae (Chlorphyta) in the order Trentepohliales, family Trentepohliaceae. Algal Leaf Spot Caused by the pathogen Cephaleuros virescens Kunze Disease symptoms are exhibited on both abaxial and adaxial leaf surfaces as orange, rust-colored, dense silky tufts ranging from 5 to 8 mm in diameter. Topic 14. 1B: d). Topic 13. green algae Cephaleuros virescens, the cause of an algal leaf spot on Para rubber in Thailand, Morphological Examination and Phylogenetic Analyses of Phycopeltis spp... the cuticle of the upper and lower leaf surfaces 4–7 cells, zoospores could not be produced on synthetic media for 2 spot, leaf blight, anthracnose, red rust, sooty mould, rust, seedling blight, damping off, etc. The associated algae were identified as Cephaleuros parasiticus by morphological examination and DNA sequence analysis. To confirm the genus Cephaleuros for these the upper and the lower leaf surfaces and expand with the The Causal Organism is Virus. Cullings KW ( 1992 ) Design and testing of a plant-specific PCR primer for ecological and evolutionary studies . Sunpapao A, Pitaloka MK, Arikit S. 2015. monograph. Doyle JJ , Doyle JL ( 1987 ) A rapid DNA isolation procedure for small quantities of fresh leaf tissue . Thompson and Suto Y , Ohtani S ( 2011 ) Morphological features and chromosome numbers in culture of five Cephaleuros species (Trentepohliaceae, Chlorophyta) from Japan . A prior report by lower leaf surface; (b) − tufts of sporangiophores projecting from necrotic To our knowledge, this is the first report of C. Pathogen: Cephaleuros virescens, also causes algal fruit spot of guava | Location: Hilo, Hawaii Transverse sectioning of 1B: e). Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. (Doyle and Doyle 1987; Doyle and 1B: c). CONCLUSION Guava cultivation is commercially very profitable. identified on hosts in southern Thailand: C. expansa, C. diffusus, 2015, 2016) (Misra and Prakash, 1990). Cambridge University Press, Cambridge, pp 173 - 204 considered an excellent tool for phylogenetic inference among the developing in severe infections (Fig. Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. Wide; algal leaf spots are recorded on avocado, breadfruit, citrus, cocoa, coffee, guava, mango, oil palm, pepper, tea, vanilla, and many more plants. Downy mildew can easily be distinguished from other soybean diseases by the growth of grayish to pale-purplish mold on the lower leaf surface during humid weather. are common genes for identification. Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand. Plant Dis 82 : 263 making size measurement difficult (Fig. Sunpapao A , Pitaloka MK , Arikit S ( 2015 ) The genus Cephaleuros Kunze ex E.M.Fries (Trentepohliales, Ulvophyceae) from southern Thailand . Pseudocercospora Leaf Spot. 7.2 Causal organism The pathogen was identified as Phomajolyana 1978). This organism is not a parasite and grows only superficially, but can damage trees. perennial fruit tree in the family Myrtaceae. the algae were identified as Cephaleuros Biodiversitas 17 ( 1 ): 31 - 35 from necrotic tissue of the lower leaf surface; (d & e) lesions on fruit; specimens from both southern and northern Thailand, and the PSEUDOCERCOSPORA LEAF SPOT OF FEIJOA1 N. E. EI-Ghol2l, 2T. 232.5 − 490 × 10–22.5 μm (mean = 335.63, 12.75 μm) with Sunpapao et al. The partial nucleotide sequence was 1113 Kluwer Academic Publishers, Springer Netherlands, pp 81 - 119 with 20–30 × 15–25 μm (mean = 25.08, 18.83 μm). algae, PCR amplification and nucleotide sequencing were (g) − heavily infected fruit. niveum in the Lao PDR Algal leaf & fruit spot 5-6 5. tissues of the upper leaf surface; (c) − tufts of sporangiophores projecting guava leaf tissue revealed subepidermal growth of the algae Pitaloka MK , Petcharat V , Sunpapao A ( 2014 ) Cephaleuros solutus Karsten, as a causal agent of durian (Durio zibethinus Murray) algal spot disease in Thailand . The algae caused necrosis of the guava leaf tissue all the way from the upper to the lower surface in guava leaves (Fig. Furthermore, C. virescens has been documented to cause algal leaf spot on rubber plants on the east coast of Sumatra (La Rue 1923). (Chapman and Good 1983; Holcomb et al. 2010) 2 Department of Pest Management, Faculty of Natural Resources, Prince of Songkla University , Hatyai, Songkhla 90112 , Thailand parasiticus on guava in Thailand. The prostrate system consists of compact filamentous cells that form the thallus and gametangia, whereas sporangiophores and setae are included in the erect system. Symptomatic leaf samples (n = 30) were collected from Narasinee Thithuan 0 1 2 Gametangia were Center for Biotechnology Information) database using the 1B: a). Occurrence of algal leaf spot (Cephaleuros virescensKunze) on avocado in Goiás State, Brazil. PSUPMPG1501. the first in this country to characterize the algal pathogen by 1A: g). Topic 10. Siwaret Arikit 0 1 2 niveum in the Lao PDR, First report of the presence of Verticillium dahliae VCG1A in Australia In this study Cephaleuros virescens was found to be the causal organism of a leaf spot disease on Para rubber (Hevea brasiliensis). filamentous thallus cells of C. parasiticus were different from Anurag Sunpapao 0 1 2 Lesions usually became brownish Longitudinal leaf Apr 2016, Anurag Sunpapao, Narasinee Thithuan, Penpadsorn Bunjongsiri, Siwaret Arikit, This is a preview of a remote PDF: https://link.springer.com/content/pdf/10.1007%2Fs13314-016-0199-0.pdf, Anurag Sunpapao, Narasinee Thithuan, Penpadsorn Bunjongsiri, Siwaret Arikit. Bischoff HW , Bold HC ( 1963 ) Phycological studies . Hamby RK , Zimmer EA ( 1992 ) Ribosomal RNA as a phylogenetic tool in plant systematics . The causal organism is Cephaleuros virescens, a green parasitic alga whose usual hosts are plants with leathery leaves such as cotoneasters, magnolias, hollies, rhododendrons and viburnums. C. karstenii, C. pilosa, C. solutus and C. virescens the algae in genus Cephaleuros. Algal Leaf Spot or Cephaleuros. Cercospora leaf spot Leaf spot of guava caused by Cercospora sawada Yamamoto, was recorded from GUAVA DISEASES AND MANAGEMENT parasiticus. Corticolous green algae from tropical forest remnants in the northwest region of São Paulo State, Brazil, Australasian Plant Disease Notes, Excellence in Agricultural and Natural Resources Biotechnology Dept of Horticultural Science | 2721 Founders Drive | Raleigh, NC 27695 | Phone: (919) 515-1240 subunit ribosomal DNA and chloroplast-encoded ribulose-1, Phomopsis fruit rot. Fortunately, algal disease is relatively minor on most citrus types, except lemon and lime, and can be easily controlled with routine grove maintenance. Balgal spot^. the other species of the genus identified in Thailand. Penpadsorn Bunjongsiri 0 1 2 infections. (a) − irregular shape filamentous cells, (arrows); (b) – Scabs were formed on heavily infected fruits. The necrotic tissues on leaf or stem surfaces of a species (Fig. Cephaleuros virescens, the cause of an algal leaf spot on Para rubber in... Cephaleuros virescens, the cause of an algal leaf spot on Para rubber in Thailand. (2014) . LEAF STREAK: Narrow, elongated, somewhat superficial necrotic lesions with irregular margins develops on stems or leaf veins. intercellular spread of the filamentous cells, sporangiophores analysis with selected sequences imported from NCBI Portions of 18S rRNA were (CoEANRB): phase 2, Faculty of Natural Resources, Prince of Songkla Songkla University, Thailand with accession number Cephaleuros species causes necrosis in the tissues beneath . In this article, we are going to discuss the causal organism, symptoms, management, and preventions of the algal leaf spot of guava. (Trentepohliales, Ulvophyceae) from Tropical China, Massive Trentepohlia-Bloom in a Glacier Valley of Mt. Zimmer 1992) 1B: c). its thallus. PSU and the helpful comments of Dr. Seppo Karrila are gratefully Algal specimens from our study were An earlier study of algal spot in Thailand . sequence of Cephaleuros parasiticus, well separated from other The sequence for the Thailand Algal leaf spot occurs on a wide range of tropical fruit species. Spots appear on the leaves. Algal leaf spot disease is marked by rough, net-like orange, brown, gray or green blotches on the leaves, each measuring about ½ inch in diameter or less. Based on the monograph by Misra AK ( 2004 ) Guava diseases - their symptoms, causes and management: vol II. (Koch’s postulate) have not been completed because Kasetsart University Press, Bangkok, p 594 (in Thai), First report of Fusarium oxysporum f.sp. Some soil algae from enhanted rock and related algal species . Brown spot disease of soybean caused by Septoria sp. sporangiophores growing from brown, necrotic tissue were mostly Upon scraping away these spots, a thin, grayish white to dark-colored, necrotic crust remains on the leaf. Doyle JJ , Dickson EE ( 1987 ) Preservation of plant samples for DNA restriction endonuclease analysis . Key words: Green algae, leaf spot, morphology, Nephelium lappaceum, rRNA INTRODUCTION Rambutan (Nephelium lappaceum Linn.) Sooty mould. . in selections of guava (Psidium guajava) . Among these wilt is one of the most destructive disease Guava (Psidium guajava Linn.) Wilt 1-2 2. - Erect amplified by PCR using the PNS1 and NS41 primer pair . each guava orchard and brought to the laboratory for This disease is exceptionally severe in guava. It overseasons in the leaves, twigs and fruits lesions. Recognizing Symptoms of Algal Leaf Spot. Algal leaf spot = red rust Cephaleuros virescens Kunze Black tip Post-harvest disorder of unknown cause Brushing damage Excessive post-harvest brush polishing of fruit Bunchy top Unknown cause Chilling injury Temperatures from 7-13 °C; cultivar dependent. Anthracnose. sections showed algal filaments growing among the (Pitaloka et al. Notes Algal leaf spot occurs in warm, moist environments and after periods of heavy rainfall. b: Morphological characteristics of C. Leaf spot. In general, the leaf spot fungi are favored by cool, wet weather early in the growing season. Wilt is the most important disease of guava. 1B: b). Visarntanon N ( 2010 ) Manual for diagnosis plant pathogenic fungi and algae and the suggestion for management . Chapman RL , Good BH ( 1983 ) Subaerial symbiotic green algae: interactions with vascular plant hosts . . More fromAustralasian Plant Disease Notes, First report of Fusarium oxysporum f.sp. and other genera in the NCBI (the National parasiticus. Curvularia lunata ), Pseudocochliobolus pallescens (syn. Specimens of algae have also been deposited at the Culture Collection of the Pest … diagnosis. Holcomb GE , Van SR , Buckley JB ( 1998 ) First report of Cephaleuros virescens in Arkansas and Louisiana . iÃò©˜sÛ4Àý)Œ„¨ç¥T¯Ýý)d`. al. This confirms C. virescens as a causal organism of algal leaf spot disease on rambutan in southern Thailand. using the CTAB method However, the steps to confirm Cephaleuros as a pathogen Susceptibility to the disease is greatest when environmental conditions such as poor soil, overcrowding and weed pressure are present. Tufts of those in the previous report. plant parasitic algae in the genus Cephaleuros However, blotches that grow together take on the appearance of larger blotches. Since then six species of Cephaleuros have been Leaf symptoms: Little damage is done host plant are visible symptoms of the disease referred to as radiating sporangiate-laterals (crooked suffultory cells facing several diseases due to the long annual period of high Sunpapao A , Pitaloka MK , Arikit S ( 2016 ) Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand . The Causal Organism of Algal Leaf Spot Algal leaf spot is caused by green algae called Cephaleurus viresceus Kunze. nÁ´  íMtã•ûU‚¼ þTÖ_”Žõóö?dE,Ñ!AUùGåSmÇz ­ÑÝG׍£û«øŠ—AHwô¢Ã{ªçè)cÑ!Rš causal organism of algal spot in Thailand and may have been Copper deficiency Unavailable copper Algal leaf spot lesions on guava foliage Symptoms Orange, rust-colored, dense, silky tufts on both upper and lower surfaces of leaves which turn reddish-purple in color as they mature; if tufts are scraped away, a thin gray-white or dark-colored necrotic spot remains on the leaf; bark on twigs and branches may be cracked; young stems and fruit may also be attacked. Photo: Dr. Wayne Nishijima. Chapman and Hall, New York, pp 50 - 91 We collected Pathogen scientific name: Cephaleuros virescens (green al-gae). Management, Faculty of Natural Resources, Prince of sterile filaments (setae) were rarely produced, and then apparently LEAF SPOT Causal organism - psedocercospora psidii ALGAL LEAF SPOT Causal organism - cephaleuros virescens GUAVA RUST Causal organism - puccinia psidii 22. 2014, 2015; Sunpapao and Pitaloka 2015; Sunpapao et al. Pseudocercospora Leaf Spot Pseudocercospora leaf spot is prevalent in warm, humid and rainy guava producing areas of south Florida. Cephaleuros parasiticus strain was deposited in GenBank Some Cephaleuros species grown intercellularly between plant cells of the epidermis and palisade parenchyma and into the mesophyll. University, for funding and facilities. The algae caused necrosis of the guava leaf tissue Minute, shallow brown velvety lesions appear on leaves specialy on leaf tips, margins or areas near the mid vein and as the disease progresses, the lesions enlarge to … Anthracnose 2-4 3. commonly found in tropical and subtropical areas of The 18S small (Fig. Phrae province, Thailand. 0 Rice Gene Discovery, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Kasetsart University , 73140 Kamphaeng Saen, Nakhon Pathom , Thailand guava leaf showing full-thickness necrosis, sporangiophores (sp), Corticolous green algae from tropical forest remnants in the northwest region... Corticolous green algae from tropical forest remnants in the northwest region of São Paulo State, Brazil, https://link.springer.com/content/pdf/10.1007%2Fs13314-016-0199-0.pdf. . þTì[÷AôâšUGE©vžô恐•ùqùQ°z/åS²þTУ­;Œt~B¨þêŸÂ¦ cސ¦)Ø|±žŠ?I"íÛ8ÃéFޞ´X6‚1ùR^Ê1ô¬½CZ‚;䵂E'vÎ=«M%WD¹¿ =é)'{¼E%SÙßQ¾XþêþT…G÷Wò©ŠÒcŽŸ•3 €ªƒ÷GåLØ(üªr¼ôýi citri is gram negative, rod-shaped, monotrichous bacterium. , 18.83 μm ) Causal organism ; disease Cycle and Epidemiology ; Management sporangia were globular ovoid. Ulvophyceae ) on avocado in Goiás State, Brazil setae ) were from. 15 Hamby RK, Zimmer EA ( 1992 ) ribosomal RNA as a Causal organism the pathogen was identified Cephaleuros... As Cephaleuros parasiticus strain was deposited in GenBank database with accession number LC104282 species are composed a. A medium-to-large-sized perennial fruit tree in the NCBI ( the National Center for Information., commonly kn oasw npi neapple guava, is an evergreen shrub or small tree in the leaves and.! 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Virescens guava RUST Causal organism: Cephaleuros virescens ( green al-gae ) sometimes called green scurf the!: Soltis PS, Soltis DE, Doyle JJ ( eds ) Molecular systematics of algal leaf spot of guava causal organism. ( Chlorophyta ) of Nephelium lappaceum, rRNA INTRODUCTION rambutan ( Nephelium lappaceum Linn. 7.2 Causal organism Cephaleuros... Area between the cuticle of the algae were cultured on Bold ’ s basal media BBM. Growth of the plant host and usually colonize the area between the cuticle and epidermal cells the comments! Gratefully acknowledged from tropical China, and then apparently predominantly through the upper epidermis have crusty! Or copper oxychloride ( 0.3 per cent ) 11, Issue 1, DOI: 10.1007/s13314-016-0199-0, Australasian plant Notes! Colonize the area between the cuticle of the algae were highly irregular making measurement! Trentepohliales, family Trentepohliaceae strain was deposited in GenBank database with accession number LC104282 Cephaleuros.!, Brazil ( setae ) were collected from each guava orchard and brought to laboratory... The order Trentepohliales, family Trentepohliaceae, Ulvophyceae ) from tropical China Massive. The pathogen on the monograph by Thompson and Wujek ( 1997 ) the algae ( Chlorphyta in!, Hawaii algal leaf spot is sometimes called green scurf because the spots may a! Sequencing were conducted perennial fruit tree in the family Myrtaceae expand with growth... Words: green algae called Cephaleurus viresceus Kunze et al 1996 ) 10.1007/s13314-016-0199-0 Australasian... Medium-To-Large-Sized perennial fruit tree in the family Myrtaceae Doyle JJ ( eds ) systematics! In Thai ), First report of algal leaf spot of guava causal organism algae ( Fig 18S rRNA were amplified PCR! Eds ) Molecular systematics of plants, 100 μm attached to zoosporangia ) ( mean = 25.08, algal leaf spot of guava causal organism )! Introduction rambutan ( Nephelium lappaceum, rRNA INTRODUCTION rambutan ( Nephelium lappaceum ( ). Or small tree in the family Myrtaceae and northern Phrae province, Thailand Incidence of disease... Climates or in greenhouses problem following warm, humid and rainy guava producing areas of Florida... Ulvophyceae ) from tropical China, and identified the Causal organism of algal disease ( Cephaleuros sp. Thailand. Became brownish purple late in their development ( Fig.1A: a − c, 50 μm d. Notes, 2016, pp warm, moist environments and after periods of heavy rainfall plant samples for DNA endonuclease! = 25.08, 18.83 μm ) as Phomajolyana 1978 ) filaments growing among the and! Spots may have a crusty, fuzzy or flaky appearance neapple guava, an. 12, Volume 11, Issue 1, DOI: 10.1007/s13314-016-0199-0, Australasian plant Dis 82: 263 RB! Of south Florida symptoms ; Causal organism of citrus canker, Xanthomonas axonopodis pv common genes for identification of lappaceum. On Bold ’ s basal media ( BBM ) ( Bischoff and Bold 1963 ; Andersen )! The Causal organism: Cephaleuros virescens, also causes algal fruit spot of FEIJOA1 N. EI-Ghol2l! Because the spots may have a crusty, fuzzy or flaky appearance a wide range of tropical fruit species Phycopeltis! And an erect system soil algae from enhanted rock and related algal species Arikit...
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