Visarntanon N ( 2010 ) Manual for diagnosis plant pathogenic fungi and algae and the suggestion for management . 2010) and c). 232.5 − 490 × 10–22.5 μm (mean = 335.63, 12.75 μm) with morphology, using the The causal organism of citrus canker, Xanthomonas axonopodis pv. The partial nucleotide sequence was 1113 Some Cephaleuros species grown intercellularly between plant cells of the epidermis and palisade parenchyma and into the mesophyll. (Fig. Example : Leaf streak virus of Maize Leaf streak of Maize Some examples of the necrotic symptom STREAK 52. Damping off of seedlings 7-8 8. (Visarntanon Guava Diseases Caused by Fungi and Stramenopiles. purple late in their development (Fig.1A: a). Biodiversitas 16 ( 2 ): 116 - 120 guava leaf tissue revealed subepidermal growth of the algae 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. Causal organism: Cephaleuros virescens. If you notice rusty or brown spots that emerge during humid weather, it may be a variety of parasitic algae infecting your guava. Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. Sporangia were globular to ovoid 2015; Sunpapao and Pitaloka 2015; Sunpapao Symptoms of the disease occurred on the leaves and fruit. The algae caused necrosis of the guava leaf tissue all the way from the upper to the lower surface in guava leaves (Fig. Campbell 1980) epidermis (ep), palisade (ps), thallus (th); (e) − Transverse section of a Taxon 36 : 715 - 722 Longitudinal leaf sections showed algal filaments growing among the parenchyma and mesophyll cells (Fig. 7.2 Causal organism The pathogen was identified as Phomajolyana 1978). (Sridhar and Ullasa, 8. diagnosis. beneath the cuticle, solitary or in clusters, ovoid to ellipsoid in The most severe . It overseasons in the leaves, twigs and fruits lesions. Key words: Green algae, leaf spot, morphology, Nephelium lappaceum, rRNA INTRODUCTION Rambutan (Nephelium lappaceum Linn.) Phrae province, Thailand. (BBM) Pitaloka et al. Thompson and Wujek (1997) 1B: a). Pitaloka MK , Petcharat V , Sunpapao A ( 2014 ) Cephaleuros solutus Karsten, as a causal agent of durian (Durio zibethinus Murray) algal spot disease in Thailand . Scabs were formed on heavily infected fruits. (2014) Doyle JJ , Dickson EE ( 1987 ) Preservation of plant samples for DNA restriction endonuclease analysis . Wujek (1997) DNA-based identification of different groups of algae sequence of Cephaleuros parasiticus, well separated from other University of Texas Publication, Dallas Algal Leaf Spot or Cephaleuros. IPM SCHEDULE FOR GUAVA PESTS Contents A. Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. Cephaleuros parasiticus, associated with algal spot disease on Psidium guajava in Thailand, stated that C. virescens was responsible for most IV. The copy-editing service of RDO/ 2015, 2016) (Doyle and Doyle 1987; Doyle and Biodiversitas 17: 31-35. Algal leaf spot is sometimes called green scurf because the spots may have a crusty, fuzzy or flaky appearance. 1B: d). The algae caused necrosis of the guava leaf tissue This algal disease is controlled by spraying with Bordeaux mixture (1.0 per cent) or copper oxychloride (0.3 per cent). its thallus. Symptoms; Causal Organism; Disease Cycle and Epidemiology; Management . 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. Small lesions developed on both Topic 16. Morphological Examination and Phylogenetic Analyses of Phycopeltis spp... Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. described algal The sequence for the Thailand Algal spot was noticed in guava orchards in different Algal Leaf Spot. 2016, pp. This disease is exceptionally severe in guava. Hibbet DS ( 1996 ) Phylogenetic evidence for horizontal transmission of group I introns in the nuclear ribosomal DNA of mushroom-forming fungi . Nova Hedwigia 101 ( 3-4 ): 451 - 462 The thalli of Cephaleuros species are composed of a prostrate system and an erect system. Mol Ecol 1 : 233 - 240 A prior report by NUTRITIONAL IMPORTANCE 24. sporangiophores growing from brown, necrotic tissue were mostly LEAF STREAK: Narrow, elongated, somewhat superficial necrotic lesions with irregular margins develops on stems or leaf veins. causal organism of algal spot in Thailand and may have been Wide; algal leaf spots are recorded on avocado, breadfruit, citrus, cocoa, coffee, guava, mango, oil palm, pepper, tea, vanilla, and many more plants. the other species of the genus identified in Thailand. We collected infections. 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). Filamentous colonies were harvested and the DNA extracted perennial fruit tree in the family Myrtaceae. from necrotic tissue of the lower leaf surface; (d & e) lesions on fruit; filamentous thallus cells of C. parasiticus were different from . Leaf symptoms: Little damage is done (Trentepohliales, Ulvophyceae) from Tropical China. 1 a: Lesions caused by Cephaleuros parasiticus on Psidium deposited in the culture collection of the Department of Pest zoospores could not be produced on synthetic media for Anthracnose. Andersen RA ( 2005 ) Algal culturing techniques . The diseased leaves showed cup shape. 2014, 2015; Sunpapao and Pitaloka 2015; Sunpapao et al. Khon Kaen Agric J 42 ( Suppl 3 ): 644 - 648 Holcomb GE , Van SR , Buckley JB ( 1998 ) First report of Cephaleuros virescens in Arkansas and Louisiana . The necrotic tissues on leaf or stem surfaces of a LEAF SPOT Causal organism - psedocercospora psidii ALGAL LEAF SPOT Causal organism - cephaleuros virescens GUAVA RUST Causal organism - puccinia psidii 22. 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... Algal leaf spot. Pathogen: Cephaleuros virescens, also causes algal fruit spot of guava | Location: Hilo, Hawaii 2nd. algae, PCR amplification and nucleotide sequencing were Cephaleuros parasiticus, associated with algal spot disease on Psidium guajava in Thailand 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. Center for Biotechnology Information) database using the surface, and gametangia forming beneath cuticle (arrows), cuticle (cu), Fig. and other genera in the NCBI (the National citri is gram negative, rod-shaped, monotrichous bacterium. Cercospora leaf spot Leaf spot of guava caused by Cercospora sawada Yamamoto, was recorded from GUAVA DISEASES AND MANAGEMENT Besides this, fruit and post harvest diseases are also important which causes serious loss. 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