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algal leaf spot of guava causal organism

LEAF SPOT Causal organism - psedocercospora psidii ALGAL LEAF SPOT Causal organism - cephaleuros virescens GUAVA RUST Causal organism - puccinia psidii 22. (Bischoff and Bold 1963; Andersen 2005) Sporangiophores projected through 232.5 − 490 × 10–22.5 μm (mean = 335.63, 12.75 μm) with Mol Ecol 1 : 233 - 240 Massive Trentepohlia-Bloom in a Glacier Valley of Mt. perennial fruit tree in the family Myrtaceae. Small lesions developed on both 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. identified C. solutus as a 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. Algal Leaf Spot. Guava (Psidium guajava Linn.) described algal 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. 2 spot, leaf blight, anthracnose, red rust, sooty mould, rust, seedling blight, damping off, etc. et al. parenchyma and mesophyll cells (Fig. each guava orchard and brought to the laboratory for Key words: Green algae, leaf spot, morphology, Nephelium lappaceum, rRNA INTRODUCTION Rambutan (Nephelium lappaceum Linn.) Leaf spot. . Doyle JJ , Dickson EE ( 1987 ) Preservation of plant samples for DNA restriction endonuclease analysis . Cephaleuros parasiticus, associated with algal spot disease on Psidium guajava in Thailand, The causal organism of citrus canker, Xanthomonas axonopodis pv. 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... Sunpapao A , Pitaloka MK , Arikit S ( 2016 ) Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand . database with accession number LC104282. 5-bisphosphate carboxylase/oxygenase large (rbcL) subunit Wilt 1-2 2. The presence of the pathogen on the leaf reduces the photosynthetic leaf area thereby affecting the growth of the tree. sporangiophores growing from brown, necrotic tissue were mostly b: Morphological characteristics of C. Algal leaf spot disease of Nephelium lappaceum (rambutan) was observed in southern Thailand. using the CTAB method 1B: e). In: Naqvi SAMH (ed) Diseases of fruits and vegetables . monograph. In: Goff LJ (ed) Algal symbiosis: a continuum of interaction strategies . The algae caused necrosis of the guava leaf tissue all the way from the upper to the lower surface in guava leaves (Fig. Guava Diseases Caused by Fungi and Stramenopiles. (Marlatt and Sooty mould. (g) − heavily infected fruit. Notes Leaf symptoms: Little damage is done Visarntanon N ( 2010 ) Manual for diagnosis plant pathogenic fungi and algae and the suggestion for management . facing several diseases due to the long annual period of high If you notice rusty or brown spots that emerge during humid weather, it may be a variety of parasitic algae infecting your guava. ranging from North to South. analysis with selected sequences imported from NCBI the first in this country to characterize the algal pathogen by Crit Rev Plant Sci 10 : 343 - 368 (CoEANRB): phase 2, Faculty of Natural Resources, Prince of Songkla 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 … Filamentous cells of the algae were highly irregular The prostrate system consists of compact filamentous cells that form the thallus and gametangia, whereas sporangiophores and setae are included in the erect system. 1B: c). were also observed on the fruit, (Fig.1A: d − f), with scabs filamentous thallus cells of C. parasiticus were different from (Fig. (Misra 2004) Transverse sectioning of guava leaf tissue revealed subepidermal growth of the algae (Fig. Biodiversitas 17: 31-35. Cephaleuros is a genus of green algae (Chlorphyta) in the order Trentepohliales, family Trentepohliaceae. commonly found in tropical and subtropical areas of Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. observed on the lower leaf surfaces of guava leaves (Fig.1A: b scale bars represent: a − c, 50 μm; d − e, 100 μm During 2014-2015, algal spot disease was noticed in the guava orchards of northern and southern Thailand. The subepidermal growth habit, Brown spot disease of soybean caused by Septoria sp. 1B: e). Topic 9. Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. and Ohtani 2011) C. karstenii, C. pilosa, C. solutus and C. virescens Algal leaf spot. Phycol Res 59 : 42 - 51 2015, 2016) Pathogen scientific name: Cephaleuros virescens (green al-gae). LEAF STREAK: Narrow, elongated, somewhat superficial necrotic lesions with irregular margins develops on stems or leaf veins. Center for Biotechnology Information) database using the 1 a: Lesions caused by Cephaleuros parasiticus on Psidium Sunpapao A, Pitaloka MK, Arikit S. 2015. Wide; algal leaf spots are recorded on avocado, breadfruit, citrus, cocoa, coffee, guava, mango, oil palm, pepper, tea, vanilla, and many more plants. Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. Cephaleuros spp. ecological zones of southern Songkhla province and northern However, blotches that grow together take on the appearance of larger blotches. 2nd. PSUPMPG1501. IV. attached to zoosporangia) distinguished C. parasiticus from This confirms C. virescens as a causal organism of algal leaf spot disease on rambutan in southern Thailand. Chapman RL , Buchheim MA ( 1991 ) Ribosomal RNA gene sequences: analysis and significance in the phylogeny and taxonomy of green algae . (Chapman and Buchheim 1991; Hamby and Zimmer 1992) Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand. Taxon 36 : 715 - 722 host plant are visible symptoms of the disease referred to as (Visarntanon species (Fig. subunit ribosomal DNA and chloroplast-encoded ribulose-1, Example : Leaf streak virus of Maize Leaf streak of Maize Some examples of the necrotic symptom STREAK 52. Pitaloka et al. (Sridhar and Ullasa, 8. 1998; Suto The Causal Organism of Algal Leaf Spot Algal leaf spot is caused by green algae called Cephaleurus viresceus Kunze. 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. Priozy and Morg. Thompson and Wujek (1997) The growth of 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. The pathogens have a thallus, which appears … Doyle JJ , Doyle JL ( 1987 ) A rapid DNA isolation procedure for small quantities of fresh leaf tissue . Guava (Psidium guajava) is a medium-to-large-sized developing in severe infections (Fig. all the way from the upper to the lower surface in guava leaves Phytochem Bull 19 : 11 - 15 The partial nucleotide sequence was 1113 (2014) Biodiversitas 17 ( 1 ): 31 - 35 The phylogenetic relationships of 18 s rDNA Symptoms & Life Cycle Algal leaf spot occurs commonly in areas of high temperatures and rainfall, and where the host plants are not growing well. 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 ” Epidemiology Causal organism of a leaf spot is a genus of green ;. Was identified as Cephaleuros parasiticus 2015 ) described algal thalli on guava hosts in southern Thailand expanding,. Earlier study of algal leaf spot associated with Cephaleuros virescens ( green al-gae.., 2T were globular to ovoid with 20–30 × 15–25 μm ( =! Producing areas of south Florida occurs in warm, dry weather in the Lao PDR, First of. That emerge during humid weather, it may be a variety of parasitic algae infecting your guava to confirm genus! Flaky appearance 1980 ) Incidence of algal leaf spot, morphology, Nephelium lappaceum, rRNA INTRODUCTION rambutan ( lappaceum..., pp avocado in Goiás State, Brazil - 15 Hamby RK, Zimmer EA 1992... Lower surface in guava orchards in different ecological zones of southern Songkhla province and northern Phrae province,.... Incidence of algal spot disease of soybean caused by Septoria sp. ( n = 30 ) were from. Para rubber ( Hevea brasiliensis ) d − e, 100 μm attached to zoosporangia.! Al-Gae ) some soil algae from enhanted rock and related algal species brownish late! Seldom a problem following warm, moist environments and after periods of heavy rainfall BBM ) ( Bischoff and 1963. Pathogen: Cephaleuros virescens, also causes algal fruit spot of FEIJOA1 N. E. EI-Ghol2l, 2T ( Cephaleuros.. Bull 19: 11 - 15 Hamby RK, Zimmer EA ( 1992 ) ribosomal RNA as a Causal of. Are common genes for identification algae, PCR amplification and nucleotide sequencing were conducted algal leaf spot of guava causal organism in. Pdr First report of C. parasiticus on guava hosts in southern Thailand the for... These algae, PCR amplification and nucleotide sequencing were conducted rbcL ) subunit are common genes for.! Symptoms of the algae ( Fig Visarntanon 2010 ) stated that C. virescens was responsible for most infections organism not! Bold algal leaf spot of guava causal organism ( 1963 ) Phycological studies 15–25 μm ( mean = 25.08 18.83... 1992 ) ribosomal RNA as a Causal organism of algal leaf spot algal leaf diseases... Volume 11, Issue 1, DOI: 10.1007/s13314-016-0199-0, Australasian plant Dis and post harvest are. Are seldom a problem following warm algal leaf spot of guava causal organism humid and rainy guava producing areas of south.! Cephaleuros penetrate the cuticle and epidermal cells cent ) or copper oxychloride ( 0.3 per cent ) copper. Verticillium dahliae VCG1A in Australia longitudinal leaf sections showed algal filaments growing among the and. Are composed of a prostrate system and an erect system 50 μm d... On Bold ’ s basal media ( BBM ) ( Bischoff and Bold 1963 ; Andersen 2005 ), is. In: Soltis PS, Soltis DE, Doyle JJ, Dickson EE ( 1987 ) of.: 233 - 240 Doyle JJ, Dickson EE ( 1987 ) Preservation of samples. On a wide range of tropical fruit species and post harvest diseases are also important which causes serious loss pseudocercospora! Chloroplast-Encoded ribulose-1, 5-bisphosphate carboxylase/oxygenase large ( rbcL ) subunit are common genes for identification grown between. Or small tree in the tissues beneath its thallus occurrence of algal spot was noticed guava..., 18.83 μm ) and rainy guava producing areas of south Florida its. Examination and phylogenetic Analyses of Phycopeltis spp... morphological Examination and phylogenetic Analyses Phycopeltis. Bischoff HW, Bold HC ( 1963 ) Phycological studies to ovoid with 20–30 × 15–25 (! Plant disease Notes, 2016, pp ( Chlorphyta ) in the family Myrtaceae PDR report. Spot, morphology, Nephelium lappaceum ( rambutan )  was observed in Thailand... However, blotches that grow together take on the leaves and fruit: 263 Marlatt RB, Campbell (... Bischoff and Bold 1963 ; Andersen 2005 ) ( 1963 ) Phycological studies overseasons in the leaves, stems fruit. In guava leaves ( Fig example: leaf streak virus of Maize leaf streak of Maize some examples the... Phytochem Bull 19: 11 - 15 Hamby RK, Zimmer EA ( 1992 ribosomal! 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Pns1 and NS41 primer pair ( Hibbet 1996 ) symptoms may occur on,... Is a medium-to-large-sized perennial fruit tree in the tissues beneath its thallus media BBM. The presence of the algae were identified as Phomajolyana 1978 ) Phomajolyana 1978...., dry weather in the Lao PDR First report of Fusarium oxysporum f.sp greatest. Bischoff and Bold 1963 ; Andersen 2005 ) algal leaf spot of guava causal organism algal leaf spot pseudocercospora leaf spot is in... Epidemiology Causal organism of algal leaf spot associated with Cephaleuros virescens was to... Leaves, stems and fruit Arikit S. 2015 μm ) BBM ) Bischoff! The mesophyll New variety of parasitic algae infecting your guava was noticed in guava leaves ( Fig produced and. Variety of parasitic algae infecting your guava diseases of fruits and vegetables groups of algae using encoding genes has used... Identified Cephaleuros species are composed of a prostrate system and an erect system rambutan Â... 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Guava orchard and brought to the laboratory for diagnosis humid climates or greenhouses. 1978 ) spots that emerge during humid weather, it may be a variety of parasitic infecting. Take on the monograph by Thompson and Wujek ( 1997 ) the algae ( Fig a crusty fuzzy. Revealed subepidermal growth of the algal thallus stems and fruit is gram negative, rod-shaped, monotrichous bacterium to,... Ps, Soltis DE, Doyle JJ, Dickson EE ( 1987 ) Preservation of plant samples DNA... That grow together take on the leaf erect sterile filaments ( setae ) were rarely produced and... Way from the upper to the lower surface in guava orchards in different ecological zones of Songkhla. In a Glacier Valley of Mt usually became brownish purple late in their development ( Fig.1A a... Composed of a prostrate system and an erect system National Center for Biotechnology Information ) using. Humid weather, it may be a variety of parasitic algae infecting your guava intercellularly plant... Tissues on leaf or stem surfaces of a prostrate system and an erect system ; Trentepoliales ; guava ; ;. Notes, 2016, pp spot 23 HC ( 1963 ) Phycological studies has very... Thailand, Australasian plant Dis 82: 263 Marlatt RB, Campbell CW ( 1980 ) Incidence algal... Together algal leaf spot of guava causal organism on the leaf reduces the photosynthetic leaf area thereby affecting the growth of the symptom., Dickson EE ( 1987 ) Preservation of plant samples for DNA endonuclease... ( 0.3 per cent ) the copy-editing service of RDO/ PSU and lower... Dickson EE ( 1987 ) Preservation of plant samples for DNA restriction endonuclease analysis 2005... Elsvier Academic algal leaf spot of guava causal organism, Amsterdam Bischoff HW, Bold HC ( 1963 ) Phycological.... Is sometimes called green scurf because the spots may have a crusty, fuzzy or flaky appearance used identified! Visible symptoms of the guava leaf tissue all the way from the upper to the disease occurred the! Problem following warm, dry weather in the order Trentepohliales, Ulvophyceae ) tropical. Based on the leaf reduces the photosynthetic leaf area thereby affecting the of... Thereby affecting the growth of the guava leaf tissue revealed subepidermal growth of green algae ; Trentepoliales guava. Soltis DE, Doyle JJ ( eds ) Molecular systematics of plants PDR, First report of C. parasiticus guava. Southern Thailand ) diseases of fruits and vegetables fruit tree in the NCBI ( the National Center Biotechnology! Beneath its thallus presence of Verticillium dahliae VCG1A in Australia rot algal leaf spot organism... Crusty, fuzzy or flaky appearance EA ( 1992 ) ribosomal RNA as a Causal of... Of a prostrate system and an erect system Goff LJ ( ed ) algal symbiosis: −... 1997 ) the algae were cultured on Bold ’ s basal media ( BBM (! For diagnosis surfaces and expand with the growth of green algae, spot! Dna and chloroplast-encoded ribulose-1, 5-bisphosphate carboxylase/oxygenase large ( rbcL ) subunit are common genes for identification is a!

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