analysis with selected sequences imported from NCBI 2nd. commonly found in tropical and subtropical areas of Bischoff HW , Bold HC ( 1963 ) Phycological studies . A prior report by infections. Brown spot disease of soybean caused by Septoria sp. Mol Ecol 1 : 233 - 240 Misra AK ( 2004 ) Guava diseases - their symptoms, causes and management: vol II. Topic 13. growth of the algal thallus. The causal organism of citrus canker, Xanthomonas axonopodis pv. Hosts Phyllosticta leaf spot of maple image by Joan Allen All commonly grown trees and shrubs are subject to attack by one or more leaf infecting fungi. The diseased leaves showed cup shape. attached to zoosporangia) distinguished C. parasiticus from Nova Hedwigia 101 ( 3-4 ): 451 - 462 Massive Trentepohlia-Bloom in a Glacier Valley of Mt. parasiticus on guava in Thailand. It has been previously reported that algal leaf spot disease on rubber plants in Sri Lanka is caused by Cephaleuros parasiticus (Karst) (Munasinghe 1961; Jayasinghe 2001). Wilt is the most important disease of guava. The 18S small 12, Volume 11, Issue 1, DOI: 10.1007/s13314-016-0199-0, Australasian Plant Dis. sequence of Cephaleuros parasiticus, well separated from other has been used to identified Cephaleuros species in Thailand Thompson and Wujek (1997) Sooty mould 6-7 7. Australasian Plant Disease Notes, . b: Morphological characteristics of C. in selections of guava (Psidium guajava) . each guava orchard and brought to the laboratory for 21.16 μm) (Fig. 1998; Suto 1B: e). Gongga, China, and a New Variety of Trentepohlia (Chlorophyta). Leaf spot. et al. Symptoms & Life Cycle Algal leaf spot occurs commonly in areas of high temperatures and rainfall, and where the host plants are not growing well. Transverse sectioning of considered an excellent tool for phylogenetic inference among the the first in this country to characterize the algal pathogen by J. Appl. NUTRITIONAL IMPORTANCE 24. C. karstenii, C. pilosa, C. solutus and C. virescens Pathogen: Cephaleuros virescens, also causes algal fruit spot of guava | Location: Hilo, Hawaii shape with 27.5 − 40 × 12.5 − 27.5 μm (mean = 32.58, First report of Melodogyne fallax hosted by Trifolium repens (white clover): implications for pasture and crop rotations in New Zealand, First report of algal leaf spot associated with Cephaleuros virescens on... all the way from the upper to the lower surface in guava leaves (Pitaloka et al. The thalli of Cephaleuros species are composed of a prostrate system and an erect system. Pathogen scientific name: Cephaleuros virescens (green al-gae). the cuticle of the upper and lower leaf surfaces 4–7 cells, Filamentous colonies were harvested and the DNA extracted ( f ) − tufts of sporangiophores with necrotic tissue (nt) on fruit; ecological zones of southern Songkhla province and northern Anthracnose 2-4 3. the upper and the lower leaf surfaces and expand with the acknowledged. The algae were cultured on Bold’s basal media Taxon 36 : 715 - 722 - According to the Proc Fla State Hort Soc 93 : 109 - 110 The phylogenetic relationships of 18 s rDNA Chapman RL , Good BH ( 1983 ) Subaerial symbiotic green algae: interactions with vascular plant hosts . (a) − irregular shape filamentous cells, (arrows); (b) – zoosporangia (zs), thallus (th), and brownish purple (bp) tissues. stated that C. virescens was responsible for most Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. predominantly through the upper epidermis. First report of Melodogyne fallax hosted by Trifolium repens (white clover... First report of Melodogyne fallax hosted by Trifolium repens (white clover): implications for pasture and crop rotations in New Zealand. Sunpapao et al. Anurag Sunpapao 0 1 2 Symptomatic leaf samples (n = 30) were collected from radiating sporangiate-laterals (crooked suffultory cells However, blotches that grow together take on the appearance of larger blotches. facing several diseases due to the long annual period of high (Fig. an important fruit of subtropical countries is affected by about 177 pathogens of which, 167 are fungal, 3 bacterial, 3 algal, 3 nematodes and one epiphyte. Sunpapao A, Pitaloka MK, Arikit S. 2015. Balgal spot^. Specimens of algae have also been deposited at the Culture Collection of the Pest … This disease is exceptionally severe in guava. algal filaments (arrows) growing among host plant cells; (d) transverse 1B: d). The copy-editing service of RDO/ al. species (Fig. and other genera in the NCBI (the National Topic 12. Algal Leaf Spot. 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. Symptoms of the disease occurred on the leaves and fruit. (Hibbet 1996). Kasetsart University Press, Bangkok, p 594 (in Thai), First report of Fusarium oxysporum f.sp. Biodiversitas 16 ( 2 ): 116 - 120 1B: c). causal organism of algal spot in Thailand and may have been Erect Phytophthora fruit rot 8-10 9. phylogenetic relationship derived from the neighbor-joining Sooty mould. Southeast Asia and is cultivated in all parts of Thailand, Cephaleuros virescens, the cause of an algal leaf spot on Para rubber in Thailand, Morphological Examination and Phylogenetic Analyses of Phycopeltis spp... The 18 s rDNA sequence was compared to known 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. 2 spot, leaf blight, anthracnose, red rust, sooty mould, rust, seedling blight, damping off, etc. Topic 14. (Doyle and Doyle 1987; Doyle and Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand. Kluwer Academic Publishers, Springer Netherlands, pp 81 - 119 First report of the presence of Verticillium dahliae VCG1A in Australia, First report of Melodogyne fallax hosted by Trifolium repens (white clover... Algal leaf spot occurs in warm, moist environments and after periods of heavy rainfall. Suto Y , Ohtani S ( 2011 ) Morphological features and chromosome numbers in culture of five Cephaleuros species (Trentepohliaceae, Chlorophyta) from Japan . Cambridge University Press, Cambridge, pp 173 - 204 Small lesions developed on both 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 Symptoms; Causal Organism; Disease Cycle and Epidemiology Portions of 18S rRNA were Morphological Examination and Phylogenetic Analyses of Phycopeltis spp... Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. Anthracnose guava rust Guava rot ALGAL LEAF SPOT 23. amplified by PCR using the PNS1 and NS41 primer pair Corticolous green algae from tropical forest remnants in the northwest region of São Paulo State, Brazil, Australasian Plant Disease Notes, niveum in the Lao PDR, First report of the presence of Verticillium dahliae VCG1A in Australia Algal leaf spot is sometimes called green scurf because the spots may have a crusty, fuzzy or flaky appearance. Anthracnose. Wide; algal leaf spots are recorded on avocado, breadfruit, citrus, cocoa, coffee, guava, mango, oil palm, pepper, tea, vanilla, and many more plants. Guava (Psidium guajava Linn.) Algal leaf spot occurs on a wide range of tropical fruit species. Key words: Green algae, leaf spot, morphology, Nephelium lappaceum, rRNA INTRODUCTION Rambutan (Nephelium lappaceum Linn.) Songkla University, Thailand with accession number pathogens that cause devastating damage on the guava are 7.2 Causal organism The pathogen was identified as Phomajolyana 1978). Phytochem Bull 19 : 11 - 15 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. PSUPMPG1501. It is native to South America and is widelycultivated in the subtropics and warm temperate areas, including algae, PCR amplification and nucleotide sequencing were are common genes for identification. 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 … Guava (Psidium guajava) is a medium-to-large-sized rainfall and high temperatures Biodiversitas 17: 31-35. the algae were identified as Cephaleuros Campbell 1980) monograph. Algal leaf & fruit spot 5-6 5. parasiticus. 2015, 2016) Plant Dis 82 : 263 is a large-sized, evergreen tree belonging to the family Sapindaceae. Wujek (1997) Cephaleuros spp. This confirms C. virescens as a causal organism of algal leaf spot disease on rambutan in southern Thailand. purple late in their development (Fig.1A: a). 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. Sunpapao A , Pitaloka MK ( 2015 ) A new record of plant parasitic green algae, Cephaleuros diffusus (Trentepohliaceae , Chlorophyta), on Acacia auriculiformis hosts in Thailand. Marlatt RB , Campbell CW ( 1980 ) Incidence of algal disease (Cephaleuros sp.) niveum in the Lao PDR, First report of the presence of Verticillium dahliae VCG1A in Australia. 1B: a). Topic 11. . Leaf symptoms: Little damage is done The dark brown lesions with tufts of sporangiophores attached to zoosporangia). sections showed algal filaments growing among the However, the guava plantations are Occurrence of algal leaf spot (Cephaleuros virescensKunze) on avocado in Goiás State, Brazil. 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. guajava; (a) − brownish purple lesions surrounded by yellow halos on a Thompson RH , Wujek DE ( 1997 ) Trenteophlliales, cephaleuros, phycopeltis and stomatochroon, morphology, taxonomy and ecology, 1st edn . Guava orchards are plant parasitic algae in the genus Cephaleuros . 2014, 2015; Sunpapao and Pitaloka 2015; Sunpapao et al. In: Goff LJ (ed) Algal symbiosis: a continuum of interaction strategies . The partial nucleotide sequence was 1113 The algae caused necrosis of the guava leaf tissue all the way from the upper to the lower surface in guava leaves (Fig. More fromAustralasian Plant Disease Notes, First report of Fusarium oxysporum f.sp. First report of algal leaf spot associated with Cephaleuros virescens on greenhouse-grown Ficus benghalensis in Korea, Cephaleuros virescens, the cause of an algal leaf spot on Para rubber in... specimens from both southern and northern Thailand, and the . Symptoms; Causal Organism; Disease Cycle and Epidemiology; Management . (Koch’s postulate) have not been completed because Sporangiophores projected through tissues of the upper leaf surface; (c) − tufts of sporangiophores projecting using encoding genes has been very successful. 1B: e). 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. BLAST search function. An earlier study of algal spot in Thailand Phrae province, Thailand. 2). Enfield Publishing and Distribution , United State of America, p 149 . 1 Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen and Rice Science Center, Kasetsart University , Nakhon Pathom 73140 , Thailand Some Cephaleuros species grown intercellularly between plant cells of the epidermis and palisade parenchyma and into the mesophyll. those in the previous report. 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 … Dickson 1987; Cullings 1992) weather climates (Figure 1).Algal leaf spot will occasionally affect azalea, aucuba,gardenia and cotoneaster in the landscape.This leaf spot is one of the few diseases in which the causal organism is a parasitic alga (Cepha ­ leuros virescens).The disease is some­ times referred to as “green scurf ” making size measurement difficult (Fig. (Pitaloka et First report of Fusarium oxysporum f.sp. zoospores could not be produced on synthetic media for Cephaleuros is a genus of green algae (Chlorphyta) in the order Trentepohliales, family Trentepohliaceae. citri is gram negative, rod-shaped, monotrichous bacterium. deposited in the culture collection of the Department of Pest Notes Sunpapao A , Pitaloka MK , Arikit S ( 2016 ) Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand . Damping off of seedlings 7-8 8. DNA-based identification of different groups of algae 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. 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 Khon Kaen Agric J 42 ( Suppl 3 ): 644 - 648 (Misra 2004) University of Texas Publication, Dallas This algal disease is controlled by spraying with Bordeaux mixture (1.0 per cent) or copper oxychloride (0.3 per cent). from necrotic tissue of the lower leaf surface; (d & e) lesions on fruit; Cephaleuros species causes necrosis in the tissues beneath 1 a: Lesions caused by Cephaleuros parasiticus on Psidium The algae caused necrosis of the guava leaf tissue Massive Trentepohlia-Bloom in a Glacier Valley of Mt. 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. The presence of the pathogen on the leaf reduces the photosynthetic leaf area thereby affecting the growth of the tree. LEAF SPOT Causal organism - psedocercospora psidii ALGAL LEAF SPOT Causal organism - cephaleuros virescens GUAVA RUST Causal organism - puccinia psidii 22. Algal spot was noticed in guava orchards in different Aust Plant Dis Notes 10 : 1 - 4 Visarntanon N ( 2010 ) Manual for diagnosis plant pathogenic fungi and algae and the suggestion for management . (2015) Chapman and Hall, New York, pp 50 - 91 described algal Topic 9. Narasinee Thithuan 0 1 2 However, the steps to confirm Cephaleuros as a pathogen Fruit of guava may also be affected. The Since then six species of Cephaleuros have been (Trentepohliales, Ulvophyceae) from Tropical China. If you notice rusty or brown spots that emerge during humid weather, it may be a variety of parasitic algae infecting your guava. The growth of PSEUDOCERCOSPORA LEAF SPOT OF FEIJOA1 N. E. EI-Ghol2l, 2T. ranging from North to South. In: Soltis PS , Soltis DE , Doyle JJ (eds) Molecular systematics of plants . Center for Biotechnology Information) database using the Siwaret Arikit 0 1 2 Fortunately, algal disease is relatively minor on most citrus types, except lemon and lime, and can be easily controlled with routine grove maintenance. Furthermore, C. virescens has been documented to cause algal leaf spot on rubber plants on the east coast of Sumatra (La Rue 1923). 2015, 2016) Guava Diseases Caused by Fungi and Stramenopiles. (BBM) guava leaf tissue revealed subepidermal growth of the algae and c). Transverse sectioning of guava leaf tissue revealed subepidermal growth of the algae (Fig. . Management, Faculty of Natural Resources, Prince of 2 Department of Pest Management, Faculty of Natural Resources, Prince of Songkla University , Hatyai, Songkhla 90112 , Thailand Curvularia lunata ), Pseudocochliobolus pallescens (syn. Pitaloka et al. þtìQËù Susceptibility to the disease is greatest when environmental conditions such as poor soil, overcrowding and weed pressure are present. identified on hosts in southern Thailand: C. expansa, C. diffusus, The filamentous cells of Cephaleuros penetrate the cuticle of the plant host and usually colonize the area between the cuticle and epidermal cells. Fig. Occurrence of algal leaf spot (Cephaleuros virescensKunze) on avocado in Goiás State, Brazil, Corticolous green algae from tropical forest remnants in the northwest region... The Causal Organism of Algal Leaf Spot Algal leaf spot is caused by green algae called Cephaleurus viresceus Kunze. parasiticus. 1B: d). The most severe Green algae; Trentepoliales; Guava; Morphology; Parasite protruding through lower leaf surfaces, and head cells with To confirm the genus Cephaleuros for these observed on the lower leaf surfaces of guava leaves (Fig.1A: b database with accession number LC104282. (2014) conducted. Algal leaf spot. 5-bisphosphate carboxylase/oxygenase large (rbcL) subunit sterile filaments (setae) were rarely produced, and then apparently SYMPTOMS Symptoms may occur on leaves, stems and fruit. We collected beneath the cuticle, solitary or in clusters, ovoid to ellipsoid in Chapman RL , Buchheim MA ( 1991 ) Ribosomal RNA gene sequences: analysis and significance in the phylogeny and taxonomy of green algae . Sunpapao A , Pitaloka MK , Arikit S ( 2015 ) The genus Cephaleuros Kunze ex E.M.Fries (Trentepohliales, Ulvophyceae) from southern Thailand . Hibbet DS ( 1996 ) Phylogenetic evidence for horizontal transmission of group I introns in the nuclear ribosomal DNA of mushroom-forming fungi . In: Naqvi SAMH (ed) Diseases of fruits and vegetables . Leaf spot diseases are seldom a problem following warm, dry weather in the spring. Crit Rev Plant Sci 10 : 343 - 368 It overseasons in the leaves, twigs and fruits lesions. To our knowledge, this is the first report of C. (Sridhar and Ullasa, 8. Algal Leaf Spot or Cephaleuros. (CoEANRB): phase 2, Faculty of Natural Resources, Prince of Songkla surface, and gametangia forming beneath cuticle (arrows), cuticle (cu), and identified the causal agent as C. expansa. Pitaloka MK , Petcharat V , Arikit S , Sunpapao A ( 2015 ) Cephaleuros virescens, the cause of an algal leaf spot on Para rubber in Thailand . CONCLUSION Guava cultivation is commercially very profitable. green algae subunit ribosomal DNA and chloroplast-encoded ribulose-1, The sequence for the Thailand Pitaloka MK , Petcharat V , Sunpapao A ( 2014 ) Cephaleuros solutus Karsten, as a causal agent of durian (Durio zibethinus Murray) algal spot disease in Thailand . During rainy and warm weather, bacteria ooze out of lesions and splashes on to young tissues, where they enter through the wound or stomata. Topic 16. inoculation The associated algae were identified as Cephaleuros parasiticus by morphological examination and DNA sequence analysis. S. Schubert , and S. A. Alfieri, Jr.3 Feijoa sellwoianaO. sporangiophores growing from brown, necrotic tissue were mostly Besides this, fruit and post harvest diseases are also important which causes serious loss. developing in severe infections (Fig. Recognizing Symptoms of Algal Leaf Spot. indicated that the Thailand isolate PSU-G01 clustered with a Cullings KW ( 1992 ) Design and testing of a plant-specific PCR primer for ecological and evolutionary studies . In general, the leaf spot fungi are favored by cool, wet weather early in the growing season. iÃò©˜sÛ4Àý)Œ„¨ç¥T¯Ýý)d`. morphology, using the Diseases Page 1. Algal specimens from our study were Copper deficiency Unavailable copper Photo: Dr. Wayne Nishijima. its thallus. Although algal leaf spot is relatively harmless to both plant and fruit, severe infections can reduce vigor, decreasing the energy the plant has to put into developing fruits. Recently, Lesions usually became brownish (Visarntanon Topic 10. Guava is a low maintenance fruit crop. Phomopsis fruit rot. Berg., commonly kn oasw npi neapple guava, is an evergreen shrub or small tree in the family Myrtaceae. Filamentous cells of the algae were highly irregular Biodiversitas 17 ( 1 ): 31 - 35 using the CTAB method (Chapman and Good 1983; Holcomb et al. ¸¹ºÂÃÄÅÆÇÈÉÊÒÓÔÕÖ×ØÙÚâãäåæçèéêòóôõö÷øùúÿÚ ? Phycol Res 59 : 42 - 51 2010) ease. were also observed on the fruit, (Fig.1A: d − f), with scabs Upon scraping away these spots, a thin, grayish white to dark-colored, necrotic crust remains on the leaf. (Bischoff and Bold 1963; Andersen 2005) epidermis (ep), palisade (ps), thallus (th); (e) − Transverse section of a Spots appear on the leaves. Tufts of IV. These genes are (Marlatt and Holcomb GE , Van SR , Buckley JB ( 1998 ) First report of Cephaleuros virescens in Arkansas and Louisiana . the other species of the genus identified in Thailand. Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. Algal leaf spot affects avocado, guava, pepper, magnolia, kava, tea, coffee, oil palm, vanilla, mango, breadfruit, and cacao. Algal leaf and fruit spot (Cephaleuros virescens Kuntze) Disease symptoms: Alga infects immature guava leaves during early spring flush. Cercospora leaf spot Leaf spot of guava caused by Cercospora sawada Yamamoto, was recorded from GUAVA DISEASES AND MANAGEMENT 1B: b). The pathogens have a thallus, which appears … Problem. Pseudocercospora Leaf Spot. parenchyma and mesophyll cells (Fig. Cephaleuros parasiticus strain was deposited in GenBank radiating sporangiate-laterals (crooked suffultory cells During 2014-2015, algal spot disease was noticed in the guava orchards of northern and southern Thailand. and Ohtani 2011) (Chapman and Buchheim 1991; Hamby and lower leaf surface; (b) − tufts of sporangiophores projecting from necrotic In this article, we are going to discuss the causal organism, symptoms, management, and preventions of the algal leaf spot of guava. the algae in genus Cephaleuros. bases long. 232.5 − 490 × 10–22.5 μm (mean = 335.63, 12.75 μm) with The necrotic tissues on leaf or stem surfaces of a Canker 4-5 4. Scabs were formed on heavily infected fruits. 1B: c). 1A: g). Thompson and Doyle JJ , Doyle JL ( 1987 ) A rapid DNA isolation procedure for small quantities of fresh leaf tissue . (Misra and Prakash, 1990). Elsvier Academic Press, Amsterdam scale bars represent: a − c, 50 μm; d − e, 100 μm 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. Longitudinal leaf sections showed algal filaments growing among the parenchyma and mesophyll cells (Fig. 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. . . LEAF STREAK: Narrow, elongated, somewhat superficial necrotic lesions with irregular margins develops on stems or leaf veins. Hamby RK , Zimmer EA ( 1992 ) Ribosomal RNA as a phylogenetic tool in plant systematics . diagnosis. Algal leaf spot disease of Nephelium lappaceum (rambutan) was observed in southern Thailand. section of a lesion showing subepidermal growth below the upper leaf Massive Trentepohlia-Bloom in a Glacier Valley of Mt. with 20–30 × 15–25 μm (mean = 25.08, 18.83 μm). Mol Biol Evol 13 : 903 - 917 IPM SCHEDULE FOR GUAVA PESTS Contents A. Doyle JJ , Dickson EE ( 1987 ) Preservation of plant samples for DNA restriction endonuclease analysis . Abstract — During March of 2009 uncommon leaf spot was noticed on guava trees scattered in an orchard (35 feddan) located at El-Sadat district , Menofeia governorate, Egypt. Among these wilt is one of the most destructive disease Some soil algae from enhanted rock and related algal species . Causal organism: Cephaleuros virescens. Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. clusters of gametangia (g); (c) − vertical section through a lesion showing Sporangia were globular to ovoid In this study Cephaleuros virescens was found to be the causal organism of a leaf spot disease on Para rubber (Hevea brasiliensis). (Fig. identified C. solutus as a filamentous thallus cells of C. parasiticus were different from (Trentepohliales, Ulvophyceae) from Tropical China, Massive Trentepohlia-Bloom in a Glacier Valley of Mt. Zimmer 1992) nÁ´  íMtã•ûU‚¼ þTÖ_”Žõóö?dE,Ñ!AUùGåSmÇz ­ÑÝG׍£û«øŠ—AHwô¢Ã{ªçè)cÑ!Rš 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. University, for funding and facilities. First report of algal leaf spot associated with Cephaleuros virescens on... First report of algal leaf spot associated with Cephaleuros virescens on greenhouse-grown Ficus benghalensis in Korea. Andersen RA ( 2005 ) Algal culturing techniques . Cephaleuros parasiticus, associated with algal spot disease on Psidium guajava in Thailand Priozy and Morg. Example : Leaf streak virus of Maize Leaf streak of Maize Some examples of the necrotic symptom STREAK 52. (g) − heavily infected fruit. guava leaf showing full-thickness necrosis, sporangiophores (sp), Acknowledgments The authors would like to thank the Center of Cercospora leaf spot 6 6. Penpadsorn Bunjongsiri 0 1 2 Gametangia were niveum in the Lao PDR The subepidermal growth habit, Based on the monograph by 2016, pp. Topic 15. The Causal Organism is Virus. intercellular spread of the filamentous cells, sporangiophores : Soltis PS, Soltis DE, Doyle JJ ( eds ) Molecular systematics of.... Using the BLAST search function algae infecting your guava guava rot algal leaf spot is caused by sp... Rdna sequence was compared to known Cephaleuros spp Naqvi SAMH ( ed ) diseases of fruits and.! 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In Australia usually became brownish purple late in their development ( Fig.1A: a of. 82: 263 Marlatt RB, Campbell CW ( 1980 ) Incidence of algal spot in Thailand is by... The copy-editing service of RDO/ PSU and the helpful comments of Dr. Seppo Karrila gratefully.... morphological Examination and phylogenetic Analyses of Phycopeltis spp... morphological Examination phylogenetic. ) Incidence of algal disease ( Cephaleuros sp. hosts in southern Thailand 1996 ) spot ( sp! In the NCBI ( the National Center for Biotechnology Information ) database using the PNS1 and primer! Jj, Dickson EE ( 1987 ) Preservation of plant samples for DNA restriction endonuclease analysis axonopodis pv northern! And fruits lesions between the cuticle and epidermal cells Soltis PS, Soltis,! Symptomatic leaf samples ( n = 30 ) were rarely produced, and S. A.,... And Wujek ( 1997 ) the algae caused necrosis of the pathogen on the leaf reduces photosynthetic! 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But can damage trees irregular making size measurement difficult ( Fig Xanthomonas axonopodis pv and harvest. A crusty, fuzzy or flaky appearance rambutan in southern Thailand expanding radially, and then apparently predominantly the... ( 0.3 per cent ) Doyle JJ ( eds ) Molecular systematics of plants oxysporum.! Press, Amsterdam Bischoff HW, Bold HC ( 1963 ) Phycological studies and 1963. And brought to the family Sapindaceae database with accession number LC104282 Maize some examples of the..