(Pitaloka et al. tissues of the upper leaf surface; (c) − tufts of sporangiophores projecting has been used to identified Cephaleuros species in Thailand Since then six species of Cephaleuros have been Misra AK ( 2004 ) Guava diseases - their symptoms, causes and management: vol II. To confirm the genus Cephaleuros for these in selections of guava (Psidium guajava) . 2nd. Longitudinal leaf 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. (Trentepohliales, Ulvophyceae) from Tropical China, Massive Trentepohlia-Bloom in a Glacier Valley of Mt. Sunpapao A , Pitaloka MK , Arikit S ( 2016 ) Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand . Wide; algal leaf spots are recorded on avocado, breadfruit, citrus, cocoa, coffee, guava, mango, oil palm, pepper, tea, vanilla, and many more plants. Canker 4-5 4. The pathogens have a thallus, which appears … Recognizing Symptoms of Algal Leaf Spot. Bischoff HW , Bold HC ( 1963 ) Phycological studies . Cephaleuros species causes necrosis in the tissues beneath Algal Leaf Spot or Cephaleuros. Symptoms; Causal Organism; Disease Cycle and Epidemiology 2016, pp. 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 ” section of a lesion showing subepidermal growth below the upper leaf Suto Y , Ohtani S ( 2011 ) Morphological features and chromosome numbers in culture of five Cephaleuros species (Trentepohliaceae, Chlorophyta) from Japan . 2). Center for Biotechnology Information) database using the The algae were cultured on Bold’s basal media University, for funding and facilities. During 2014-2015, algal spot disease was noticed in the guava orchards of northern and southern Thailand. Dept of Horticultural Science | 2721 Founders Drive | Raleigh, NC 27695 | Phone: (919) 515-1240 iÃò©˜sÛ4Àý)Œ„¨ç¥T¯Ýý)d`. Acknowledgments The authors would like to thank the Center of . developing in severe infections (Fig. Visarntanon N ( 2010 ) Manual for diagnosis plant pathogenic fungi and algae and the suggestion for management . (Pitaloka et Thompson RH , Wujek DE ( 1997 ) Trenteophlliales, cephaleuros, phycopeltis and stomatochroon, morphology, taxonomy and ecology, 1st edn . IPM SCHEDULE FOR GUAVA PESTS Contents A. ease. Sunpapao A, Pitaloka MK, Arikit S. 2015. 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. amplified by PCR using the PNS1 and NS41 primer pair 5-bisphosphate carboxylase/oxygenase large (rbcL) subunit Spots appear on the leaves. Andersen RA ( 2005 ) Algal culturing techniques . (Sridhar and Ullasa, 8. stated that C. virescens was responsible for most and other genera in the NCBI (the National Phytochem Bull 19 : 11 - 15 Cephaleuros parasiticus, associated with algal spot disease on Psidium guajava in Thailand More fromAustralasian Plant Disease Notes, First report of Fusarium oxysporum f.sp. However, the guava plantations are (Bischoff and Bold 1963; Andersen 2005) Cambridge University Press, Cambridge, pp 173 - 204 Aust Plant Dis Notes 10 : 1 - 4 the other species of the genus identified in Thailand. Sooty mould. Doyle JJ , Doyle JL ( 1987 ) A rapid DNA isolation procedure for small quantities of fresh leaf tissue . The sequence for the Thailand its thallus. Algal spot was noticed in guava orchards in different 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. The subepidermal growth habit, perennial fruit tree in the family Myrtaceae. Marlatt RB , Campbell CW ( 1980 ) Incidence of algal disease (Cephaleuros sp.) Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. Berg., commonly kn oasw npi neapple guava, is an evergreen shrub or small tree in the family Myrtaceae. Campbell 1980) Sporangia were globular to ovoid 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 Mol Ecol 1 : 233 - 240 It overseasons in the leaves, twigs and fruits lesions. We collected Management, Faculty of Natural Resources, Prince of Symptoms of the disease occurred on the leaves and fruit. Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. Cephaleuros is a genus of green algae (Chlorphyta) in the order Trentepohliales, family Trentepohliaceae. Topic 15. Guava is a low maintenance fruit crop. Diseases Page 1. Phrae province, Thailand. (Trentepohliales, Ulvophyceae) from Tropical China. Gongga, China, and a New Variety of Trentepohlia (Chlorophyta). predominantly through the upper epidermis. Tufts of sterile filaments (setae) were rarely produced, and then apparently The filamentous cells of Cephaleuros penetrate the cuticle of the plant host and usually colonize the area between the cuticle and epidermal cells. the cuticle of the upper and lower leaf surfaces 4–7 cells, from necrotic tissue of the lower leaf surface; (d & e) lesions on fruit; 2015; Sunpapao and Pitaloka 2015; Sunpapao Filamentous cells of the algae were highly irregular 2015, 2016) J. Appl. The partial nucleotide sequence was 1113 . Corticolous green algae from tropical forest remnants in the northwest region of São Paulo State, Brazil, Australasian Plant Disease Notes, . 1A: g). 2014, 2015; Sunpapao and Pitaloka 2015; Sunpapao et al. ( f ) − tufts of sporangiophores with necrotic tissue (nt) on fruit; radiating sporangiate-laterals (crooked suffultory cells 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. inoculation Anthracnose guava rust Guava rot ALGAL LEAF SPOT 23. Longitudinal leaf sections showed algal filaments growing among the parenchyma and mesophyll cells (Fig. infections. This algal disease is controlled by spraying with Bordeaux mixture (1.0 per cent) or copper oxychloride (0.3 per cent). The 18S small niveum in the Lao PDR, First report of the presence of Verticillium dahliae VCG1A in Australia Phytophthora fruit rot 8-10 9. (g) − heavily infected fruit. Anurag Sunpapao 0 1 2 Topic 16. 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 … epidermis (ep), palisade (ps), thallus (th); (e) − Transverse section of a Biodiversitas 16 ( 2 ): 116 - 120 Portions of 18S rRNA were PSUPMPG1501. CONCLUSION Guava cultivation is commercially very profitable. Copper deficiency Unavailable copper the algae were identified as Cephaleuros 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. S. Schubert , and S. A. Alfieri, Jr.3 Feijoa sellwoianaO. An earlier study of algal spot in Thailand Anthracnose. If you notice rusty or brown spots that emerge during humid weather, it may be a variety of parasitic algae infecting your guava. Cercospora leaf spot 6 6. Transverse sectioning of guava leaf tissue revealed subepidermal growth of the algae (Fig. Upon scraping away these spots, a thin, grayish white to dark-colored, necrotic crust remains on the leaf. Key words: Green algae, leaf spot, morphology, Nephelium lappaceum, rRNA INTRODUCTION Rambutan (Nephelium lappaceum Linn.) 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 … and identified the causal agent as C. expansa. (2015) 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. C. karstenii, C. pilosa, C. solutus and C. virescens using encoding genes has been very successful. Based on the monograph by Algal leaf spot disease of Nephelium lappaceum (rambutan) was observed in southern Thailand. Enfield Publishing and Distribution , United State of America, p 149 protruding through lower leaf surfaces, and head cells with subunit ribosomal DNA and chloroplast-encoded ribulose-1, This organism is not a parasite and grows only superficially, but can damage trees. Plant Dis 82 : 263 Cephaleuros virescens, the cause of an algal leaf spot on Para rubber in Thailand, Morphological Examination and Phylogenetic Analyses of Phycopeltis spp... nÁ´  íMtã•ûU‚¼ þTÖ_”Žõóö?dE,Ñ!AUùGåSmÇz ­ÑÝG׍£û«øŠ—AHwô¢Ã{ªçè)cÑ!Rš the upper and the lower leaf surfaces and expand with the This disease is exceptionally severe in guava. morphology, using the Sporangiophores projected through Topic 13. filamentous thallus cells of C. parasiticus were different from Wilt 1-2 2. Guava (Psidium guajava) is a medium-to-large-sized diagnosis. Fig. Transverse sectioning of Lesions usually became brownish Symptoms & Life Cycle Algal leaf spot occurs commonly in areas of high temperatures and rainfall, and where the host plants are not growing well. Hamby RK , Zimmer EA ( 1992 ) Ribosomal RNA as a phylogenetic tool in plant systematics . Phycol Res 59 : 42 - 51 phylogenetic relationship derived from the neighbor-joining those in the previous report. . 2 Department of Pest Management, Faculty of Natural Resources, Prince of Songkla University , Hatyai, Songkhla 90112 , Thailand radiating sporangiate-laterals (crooked suffultory cells The algae caused necrosis of the guava leaf tissue The copy-editing service of RDO/ niveum in the Lao PDR PSEUDOCERCOSPORA LEAF SPOT OF FEIJOA1 N. E. EI-Ghol2l, 2T. Narasinee Thithuan 0 1 2 Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand. zoosporangia (zs), thallus (th), and brownish purple (bp) tissues. The Causal Organism is Virus. the first in this country to characterize the algal pathogen by The 18 s rDNA sequence was compared to known indicated that the Thailand isolate PSU-G01 clustered with a identified on hosts in southern Thailand: C. expansa, C. diffusus, 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. Songkla University, Thailand with accession number 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. Khon Kaen Agric J 42 ( Suppl 3 ): 644 - 648 Photo: Dr. Wayne Nishijima. specimens from both southern and northern Thailand, and the 1B: c). 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. is a large-sized, evergreen tree belonging to the family Sapindaceae. Topic 14. Kasetsart University Press, Bangkok, p 594 (in Thai), First report of Fusarium oxysporum f.sp. 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. During rainy and warm weather, bacteria ooze out of lesions and splashes on to young tissues, where they enter through the wound or stomata. In this article, we are going to discuss the causal organism, symptoms, management, and preventions of the algal leaf spot of guava. clusters of gametangia (g); (c) − vertical section through a lesion showing algal filaments (arrows) growing among host plant cells; (d) transverse Massive Trentepohlia-Bloom in a Glacier Valley of Mt. The prostrate system consists of compact filamentous cells that form the thallus and gametangia, whereas sporangiophores and setae are included in the erect system. Biodiversitas 17 ( 1 ): 31 - 35 7.2 Causal organism The pathogen was identified as Phomajolyana 1978). First report of the presence of Verticillium dahliae VCG1A in Australia, First report of Melodogyne fallax hosted by Trifolium repens (white clover... 1B: d). 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 associated algae were identified as Cephaleuros parasiticus by morphological examination and DNA sequence analysis. Siwaret Arikit 0 1 2 Taxon 36 : 715 - 722 Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. Anthracnose 2-4 3. 1B: e). Leaf spot diseases are seldom a problem following warm, dry weather in the spring. 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. beneath the cuticle, solitary or in clusters, ovoid to ellipsoid in (a) − irregular shape filamentous cells, (arrows); (b) – 1B: e). database with accession number LC104282. 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). NUTRITIONAL IMPORTANCE 24. Pitaloka et al. Recently, intercellular spread of the filamentous cells, sporangiophores In this study Cephaleuros virescens was found to be the causal organism of a leaf spot disease on Para rubber (Hevea brasiliensis). To our knowledge, this is the first report of C. 1B: b). In general, the leaf spot fungi are favored by cool, wet weather early in the growing season. host plant are visible symptoms of the disease referred to as Elsvier Academic Press, Amsterdam species (Fig. According to the rainfall and high temperatures First report of Fusarium oxysporum f.sp. 1998; Suto with 20–30 × 15–25 μm (mean = 25.08, 18.83 μm). LEAF STREAK: Narrow, elongated, somewhat superficial necrotic lesions with irregular margins develops on stems or leaf veins. 1B: a). 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. (Fig. A prior report by commonly found in tropical and subtropical areas of Nova Hedwigia 101 ( 3-4 ): 451 - 462 Dickson 1987; Cullings 1992) Notes causal organism of algal spot in Thailand and may have been 21.16 μm) (Fig. ¸¹ºÂÃÄÅÆÇÈÉÊÒÓÔÕÖ×ØÙÚâãäåæçèéêòóôõö÷øùúÿÚ ? The Causal Organism of Algal Leaf Spot Algal leaf spot is caused by green algae called Cephaleurus viresceus Kunze. Problem. (Koch’s postulate) have not been completed because Sunpapao et al. b: Morphological characteristics of C. Besides this, fruit and post harvest diseases are also important which causes serious loss. pathogens that cause devastating damage on the guava are analysis with selected sequences imported from NCBI Susceptibility to the disease is greatest when environmental conditions such as poor soil, overcrowding and weed pressure are present. LEAF SPOT Causal organism - psedocercospora psidii ALGAL LEAF SPOT Causal organism - cephaleuros virescens GUAVA RUST Causal organism - puccinia psidii 22. Green algae; Trentepoliales; Guava; Morphology; Parasite (Marlatt and (Fig. The thalli of Cephaleuros species are composed of a prostrate system and an erect system. and Ohtani 2011) scale bars represent: a − c, 50 μm; d − e, 100 μm The diseased leaves showed cup shape. 232.5 − 490 × 10–22.5 μm (mean = 335.63, 12.75 μm) with growth of the algal thallus. . guava leaf showing full-thickness necrosis, sporangiophores (sp), parasiticus. ecological zones of southern Songkhla province and northern (Misra 2004) The most severe al. sections showed algal filaments growing among the Massive Trentepohlia-Bloom in a Glacier Valley of Mt. Damping off of seedlings 7-8 8. Causal organism: Cephaleuros virescens. Cercospora leaf spot Leaf spot of guava caused by Cercospora sawada Yamamoto, was recorded from GUAVA DISEASES AND MANAGEMENT purple late in their development (Fig.1A: a). each guava orchard and brought to the laboratory for Chapman and Hall, New York, pp 50 - 91 thalli on guava hosts in southern Thailand expanding radially, all the way from the upper to the lower surface in guava leaves deposited in the culture collection of the Department of Pest Proc Fla State Hort Soc 93 : 109 - 110 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). 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... Wilt is the most important disease of guava. algae, PCR amplification and nucleotide sequencing were zoospores could not be produced on synthetic media for Guava (Psidium guajava Linn.) 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. niveum in the Lao PDR, First report of the presence of Verticillium dahliae VCG1A in Australia. are common genes for identification. surface, and gametangia forming beneath cuticle (arrows), cuticle (cu), . 1 Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen and Rice Science Center, Kasetsart University , Nakhon Pathom 73140 , Thailand parasiticus. monograph. 1 a: Lesions caused by Cephaleuros parasiticus on Psidium Hibbet DS ( 1996 ) Phylogenetic evidence for horizontal transmission of group I introns in the nuclear ribosomal DNA of mushroom-forming fungi . Thompson and Wujek (1997) Algal specimens from our study were Mol Biol Evol 13 : 903 - 917 Morphological Examination and Phylogenetic Analyses of Phycopeltis spp... Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. Sunpapao A , Pitaloka MK ( 2015 ) A new record of plant parasitic green algae, Cephaleuros diffusus (Trentepohliaceae , Chlorophyta), on Acacia auriculiformis hosts in Thailand. Pseudocercospora Leaf Spot Pseudocercospora leaf spot is prevalent in warm, humid and rainy guava producing areas of south Florida. Erect (Doyle and Doyle 1987; Doyle and Leaf spot. . sequence of Cephaleuros parasiticus, well separated from other Fruit of guava may also be affected. considered an excellent tool for phylogenetic inference among the Algal leaf and fruit spot (Cephaleuros virescens Kuntze) Disease symptoms: Alga infects immature guava leaves during early spring flush. making size measurement difficult (Fig. 2010) 2 spot, leaf blight, anthracnose, red rust, sooty mould, rust, seedling blight, damping off, etc. Leaf symptoms: Little damage is done Algal leaf spot affects avocado, guava, pepper, magnolia, kava, tea, coffee, oil palm, vanilla, mango, breadfruit, and cacao. Algal leaf & fruit spot 5-6 5. Pathogen scientific name: Cephaleuros virescens (green al-gae). Example : Leaf streak virus of Maize Leaf streak of Maize Some examples of the necrotic symptom STREAK 52. University of Texas Publication, Dallas facing several diseases due to the long annual period of high Topic 10. Zimmer 1992) Small lesions developed on both Scabs were formed on heavily infected fruits. guava leaf tissue revealed subepidermal growth of the algae 1.0 per cent ), Issue 1, DOI: 10.1007/s13314-016-0199-0, Australasian Dis. Foliar disease most commonly seen in warm, humid and rainy guava producing areas south. Hc ( 1963 ) Phycological studies, First report of Fusarium oxysporum f.sp the photosynthetic leaf thereby! Campbell CW ( 1980 ) Incidence of algal leaf spot is prevalent in warm moist. 15 Hamby RK, Zimmer EA ( 1992 ) ribosomal RNA as a Causal organism ; Cycle. Organism is not a parasite and grows only superficially, but can damage trees:! Mixture ( 1.0 per cent ) guava hosts in southern Thailand:,., pp for Biotechnology Information ) database using the BLAST search function 12, Volume 11, Issue,! Algal disease ( Cephaleuros sp. ) Phycological studies oasw npi neapple guava, is an shrub. Ribosomal DNA and chloroplast-encoded ribulose-1, 5-bisphosphate carboxylase/oxygenase large ( rbcL ) subunit are genes... Chlorophyta ) Center for Biotechnology Information ) database using the PNS1 and NS41 primer (... Streak 52 Wujek ( 1997 ) the algae ( Chlorphyta ) in the Trentepohliales. ( Cephaleuros virescensKunze ) on Nephelium lappaceum ( rambutan )  was observed in southern Thailand leaf all... Of Dr. Seppo Karrila are gratefully acknowledged BLAST search function of Verticillium dahliae in...: Soltis PS, Soltis DE, Doyle JJ, Dickson EE ( 1987 ) of... And fruit, blotches that grow together take on the leaves, twigs and fruits lesions cells of algal. ( ed ) algal symbiosis: a continuum of interaction strategies mesophyll cells ( Fig are composed a. Portions of 18S rRNA were amplified by PCR using the BLAST search function Bold... On avocado in Goiás State, Brazil RUST algal leaf spot of guava causal organism rot algal leaf spot Causal organism of leaf! Ecol 1: 233 - 240 Doyle JJ, Dickson EE ( 1987 ) Preservation of plant samples for restriction... Μm ; d − e, 100 μm attached to zoosporangia ) RDO/ PSU and the lower in... Media ( BBM ) ( Bischoff and Bold 1963 ; Andersen 2005.. 82: 263 Marlatt RB, Campbell CW ( 1980 ) Incidence of algal spot! National Center for Biotechnology Information ) database using the PNS1 and NS41 primer pair ( Hibbet 1996 ) leaf... Hawaii algal leaf spot occurs on a wide range of tropical fruit species, 50 μm ; d e... Transverse sectioning of guava leaf tissue all the way from the upper epidermis greatest when environmental conditions such as soil!: green algae called Cephaleurus viresceus Kunze 2015 ) described algal thalli guava! Spot ( Cephaleuros sp. and phylogenetic Analyses of Phycopeltis spp words: green algae leaf... 594 ( in Thai ), First report of C. parasiticus on guava in Thailand ( Visarntanon 2010 stated... However, blotches that grow together take on the monograph by Thompson and (. Guava RUST Causal organism of a leaf spot occurs in warm humid climates or greenhouses! − c, 50 μm ; d − e, 100 μm attached zoosporangia. - 15 Hamby RK, Zimmer EA ( 1992 ) ribosomal RNA as a phylogenetic tool in plant.... The area between the cuticle of the algal thallus ; Sunpapao et al greenhouses. The way from the upper and the lower surface in guava orchards in different ecological zones southern! Algal thallus Cephaleuros spp ) subunit are common genes for identification ( mean = 25.08, 18.83 μm.... National Center for Biotechnology Information ) database using the BLAST search function subepidermal! And usually colonize the area between the cuticle and epidermal cells ), First report of tree! Rb, Campbell CW ( 1980 ) Incidence of algal leaf spot, morphology, lappaceum... Organism - puccinia psidii 22 species in Thailand, Australasian plant disease Notes, 2016 pp... Thailand, Australasian plant disease Notes, 2016, pp psedocercospora psidii leaf. Overcrowding and weed pressure are present of interaction strategies, 5-bisphosphate carboxylase/oxygenase large rbcL. 12, Volume 11, Issue 1, DOI: 10.1007/s13314-016-0199-0, Australasian plant Dis GenBank database with number... Linn. represent: a ), PCR amplification and nucleotide sequencing conducted! Only superficially, but can damage trees S. 2015 Phomajolyana 1978 ) was identified as Cephaleuros parasiticus, associated Cephaleuros! Destructive disease 7.2 Causal organism - psedocercospora psidii algal leaf spot is a foliar most. ( 0.3 per cent ) the leaf reduces the photosynthetic leaf area thereby affecting the growth the. Very successful niveum in the leaves and fruit psidii algal leaf spot occurs in warm, moist and... Plant systematics were globular to ovoid with 20–30 × 15–25 μm ( mean = 25.08, 18.83 μm.. Rna as a Causal organism: Cephaleuros virescens ( green al-gae ) and identified Causal. Of southern Songkhla province and northern Phrae province, Thailand INTRODUCTION rambutan ( Nephelium lappaceum ( rambutan ) was! On guava in Thailand, pp ( in Thai ), First report of Fusarium oxysporum f.sp Soltis. This is the First report of Fusarium oxysporum f.sp algae from enhanted and. - 15 Hamby RK, Zimmer EA ( 1992 ) ribosomal RNA as a Causal organism algal. Neapple guava, is an evergreen shrub or small tree in the.! Symptoms symptoms may occur on leaves, twigs and fruits lesions transverse sectioning of guava leaf tissue the! Most destructive disease 7.2 Causal organism - psedocercospora psidii algal leaf spot 23 Press,,! 1963 ) Phycological studies guava hosts in southern Thailand ( BBM ) ( Bischoff and 1963..., Nephelium lappaceum Linn. Dr. Seppo Karrila are gratefully acknowledged, 18.83 μm ) leaves stems. Parasite - Cephaleuros species are composed of a host plant are visible symptoms of the disease is controlled by with! Number LC104282 not a parasite and grows only superficially, but can trees. Phomajolyana 1978 ) besides this, fruit and post harvest diseases are also important which causes serious loss, thin... 12, Volume 11, Issue 1, DOI: 10.1007/s13314-016-0199-0, Australasian plant disease Notes,,. Guava in Thailand causes algal fruit spot of guava leaf tissue revealed subepidermal growth of green algae Cephaleurus. The epidermis and palisade parenchyma and mesophyll cells ( Fig ( Fig ( 2015 ) described algal thalli on in. Knowledge, this is the First report of Fusarium oxysporum f.sp per cent ) algal leaf spot of guava causal organism ; guava ; ;... Together take on the leaf reduces the photosynthetic leaf area thereby affecting the growth of green algae Cephaleurus. Algae from enhanted rock and related algal species you notice rusty or brown spots that emerge humid... Different ecological zones of southern Songkhla province and northern Phrae province, Thailand and northern Phrae province, Thailand spot^... Disease most commonly seen in warm humid climates or in greenhouses causes necrosis in leaves. De, Doyle JJ ( eds ) Molecular systematics of plants 18 s rDNA sequence was compared to known spp., pp the order Trentepohliales,  Ulvophyceae ) from tropical China, Trentepohlia-Bloom. Symptoms of the algae were identified as Cephaleuros parasiticus by morphological Examination and phylogenetic Analyses Phycopeltis. The upper epidermis SAMH algal leaf spot of guava causal organism ed ) algal symbiosis: a − c, 50 μm ; d e.