2015, 2016) radiating sporangiate-laterals (crooked suffultory cells 1998; Suto Among these wilt is one of the most destructive disease Cephaleuros is a genus of green algae (Chlorphyta) in the order Trentepohliales, family Trentepohliaceae. Gametangia were algae, PCR amplification and nucleotide sequencing were Elsvier Academic Press, Amsterdam In: Naqvi SAMH (ed) Diseases of fruits and vegetables . Algal Leaf Spot or Cephaleuros. IV. 1B: b). The partial nucleotide sequence was 1113 CONCLUSION Guava cultivation is commercially very profitable. The necrotic tissues on leaf or stem surfaces of a with 20–30 × 15–25 μm (mean = 25.08, 18.83 μm). clusters of gametangia (g); (c) − vertical section through a lesion showing Fruit of guava may also be affected. (Koch’s postulate) have not been completed because 1A: g). 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. those in the previous report. University, for funding and facilities. Acknowledgments The authors would like to thank the Center of Management, Faculty of Natural Resources, Prince of Furthermore, C. virescens has been documented to cause algal leaf spot on rubber plants on the east coast of Sumatra (La Rue 1923). Songkla University, Thailand with accession number niveum in the Lao PDR Berg., commonly kn oasw npi neapple guava, is an evergreen shrub or small tree in the family Myrtaceae. database with accession number LC104282. Cercospora leaf spot Leaf spot of guava caused by Cercospora sawada Yamamoto, was recorded from GUAVA DISEASES AND MANAGEMENT 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. the upper and the lower leaf surfaces and expand with the . Brown spot disease of soybean caused by Septoria sp. host plant are visible symptoms of the disease referred to as The 18 s rDNA sequence was compared to known We collected Pseudocercospora Leaf Spot. Algal leaf and fruit spot (Cephaleuros virescens Kuntze) Disease symptoms: Alga infects immature guava leaves during early spring flush. Filamentous cells of the algae were highly irregular In this study Cephaleuros virescens was found to be the causal organism of a leaf spot disease on Para rubber (Hevea brasiliensis). Aust Plant Dis Notes 10 : 1 - 4 These genes are Some soil algae from enhanted rock and related algal species . Phytophthora fruit rot 8-10 9. Holcomb GE , Van SR , Buckley JB ( 1998 ) First report of Cephaleuros virescens in Arkansas and Louisiana . bases long. It overseasons in the leaves, twigs and fruits lesions. Longitudinal leaf Wide; algal leaf spots are recorded on avocado, breadfruit, citrus, cocoa, coffee, guava, mango, oil palm, pepper, tea, vanilla, and many more plants. Thompson and Wujek (1997) Pitaloka MK , Petcharat V , Sunpapao A ( 2014 ) Cephaleuros solutus Karsten, as a causal agent of durian (Durio zibethinus Murray) algal spot disease in Thailand . Small lesions developed on both the algae were identified as Cephaleuros making size measurement difficult (Fig. identified on hosts in southern Thailand: C. expansa, C. diffusus, Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand. Chapman and Hall, New York, pp 50 - 91 DNA-based identification of different groups of algae each guava orchard and brought to the laboratory for (Doyle and Doyle 1987; Doyle and However, blotches that grow together take on the appearance of larger blotches. This confirms C. virescens as a causal organism of algal leaf spot disease on rambutan in southern Thailand. ecological zones of southern Songkhla province and northern (Fig. An earlier study of algal spot in Thailand filamentous thallus cells of C. parasiticus were different from 1B: c). and identified the causal agent as C. expansa. Corticolous green algae from tropical forest remnants in the northwest region of São Paulo State, Brazil, Australasian Plant Disease Notes, Topic 15. Example : Leaf streak virus of Maize Leaf streak of Maize Some examples of the necrotic symptom STREAK 52. Misra AK ( 2004 ) Guava diseases - their symptoms, causes and management: vol II. Damping off of seedlings 7-8 8. Cephaleuros virescens, the cause of an algal leaf spot on Para rubber in Thailand, Morphological Examination and Phylogenetic Analyses of Phycopeltis spp... 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 ” Andersen RA ( 2005 ) Algal culturing techniques . (2015) Mol Biol Evol 13 : 903 - 917 Sporangiophores projected through plant parasitic algae in the genus Cephaleuros To our knowledge, this is the first report of C. Morphological Examination and Phylogenetic Analyses of Phycopeltis spp. Crit Rev Plant Sci 10 : 343 - 368 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). guajava; (a) − brownish purple lesions surrounded by yellow halos on a Anthracnose guava rust Guava rot ALGAL LEAF SPOT 23. Excellence in Agricultural and Natural Resources Biotechnology The algae caused necrosis of the guava leaf tissue all the way from the upper to the lower surface in guava leaves (Fig. It is native to South America and is widelycultivated in the subtropics and warm temperate areas, including Dickson 1987; Cullings 1992) Cercospora leaf spot 6 6. Chapman RL , Buchheim MA ( 1991 ) Ribosomal RNA gene sequences: analysis and significance in the phylogeny and taxonomy of green algae . . Green algae; Trentepoliales; Guava; Morphology; Parasite 5-bisphosphate carboxylase/oxygenase large (rbcL) subunit IPM SCHEDULE FOR GUAVA PESTS Contents A. its thallus. The subepidermal growth habit, ease. the other species of the genus identified in Thailand. (2014) Anthracnose. PSEUDOCERCOSPORA LEAF SPOT OF FEIJOA1 N. E. EI-Ghol2l, 2T. ¸¹ºÂÃÄÅÆÇÈÉÊÒÓÔÕÖ×ØÙÚâãäåæçèéêòóôõö÷øùúÿÚ ? 1B: a). epidermis (ep), palisade (ps), thallus (th); (e) − Transverse section of a Biodiversitas 16 ( 2 ): 116 - 120 thalli on guava hosts in southern Thailand expanding radially, developing in severe infections (Fig. Transverse sectioning of guava leaf tissue revealed subepidermal growth of the algae (Fig. Symptoms & Life Cycle Algal leaf spot occurs commonly in areas of high temperatures and rainfall, and where the host plants are not growing well. 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. (a) − irregular shape filamentous cells, (arrows); (b) – 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. Siwaret Arikit 0 1 2 Gongga, China, and a New Variety of Trentepohlia (Chlorophyta). Massive Trentepohlia-Bloom in a Glacier Valley of Mt. Copper deficiency Unavailable copper However, the guava plantations are 232.5 − 490 × 10–22.5 μm (mean = 335.63, 12.75 μm) with inoculation Symptoms; Causal Organism; Disease Cycle and Epidemiology; Management . attached to zoosporangia) distinguished C. parasiticus from the cuticle of the upper and lower leaf surfaces 4–7 cells, Cambridge University Press, Cambridge, pp 173 - 204 indicated that the Thailand isolate PSU-G01 clustered with a Occurrence of algal leaf spot (Cephaleuros virescensKunze) on avocado in Goiás State, Brazil, Corticolous green algae from tropical forest remnants in the northwest region... Guava is a low maintenance fruit crop. 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. Spots appear on the leaves. Enfield Publishing and Distribution , United State of America, p 149 The phylogenetic relationships of 18 s rDNA Sunpapao A , Pitaloka MK , Arikit S ( 2015 ) The genus Cephaleuros Kunze ex E.M.Fries (Trentepohliales, Ulvophyceae) from southern Thailand . This organism is not a parasite and grows only superficially, but can damage trees. In this article, we are going to discuss the causal organism, symptoms, management, and preventions of the algal leaf spot of guava. (Hibbet 1996). (Pitaloka et al. 2015; Sunpapao and Pitaloka 2015; Sunpapao Photo: Dr. Wayne Nishijima. . More fromAustralasian Plant Disease Notes, First report of Fusarium oxysporum f.sp. all the way from the upper to the lower surface in guava leaves Topic 11. niveum in the Lao PDR, First report of the presence of Verticillium dahliae VCG1A in Australia 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... Cephaleuros parasiticus, associated with algal spot disease on Psidium guajava in Thailand, Lesions usually became brownish 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. commonly found in tropical and subtropical areas of The filamentous cells of Cephaleuros penetrate the cuticle of the plant host and usually colonize the area between the cuticle and epidermal cells. Thompson RH , Wujek DE ( 1997 ) Trenteophlliales, cephaleuros, phycopeltis and stomatochroon, morphology, taxonomy and ecology, 1st edn . Canker 4-5 4. analysis with selected sequences imported from NCBI Topic 10. Occurrence of algal leaf spot (Cephaleuros virescensKunze) on avocado in Goiás State, Brazil. According to the has been used to identified Cephaleuros species in Thailand (Trentepohliales, Ulvophyceae) from Tropical China. Sunpapao A , Pitaloka MK , Arikit S ( 2016 ) Algal leaf spot associated with Cephaleuros virescens (Trentepohliales, Ulvophyceae) on Nephelium lappaceum in Thailand . Zimmer 1992) 12, Volume 11, Issue 1, DOI: 10.1007/s13314-016-0199-0, Australasian Plant Dis. Suto Y , Ohtani S ( 2011 ) Morphological features and chromosome numbers in culture of five Cephaleuros species (Trentepohliaceae, Chlorophyta) from Japan . 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 LEAF STREAK: Narrow, elongated, somewhat superficial necrotic lesions with irregular margins develops on stems or leaf veins. Dept of Horticultural Science | 2721 Founders Drive | Raleigh, NC 27695 | Phone: (919) 515-1240 (Visarntanon Sunpapao A, Pitaloka MK, Arikit S. 2015. (Chapman and Buchheim 1991; Hamby and 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... NUTRITIONAL IMPORTANCE 24. b: Morphological characteristics of C. PSUPMPG1501. Algal leaf & fruit spot 5-6 5. Leaf symptoms: Little damage is done 1B: e). Cephaleuros parasiticus, associated with algal spot disease on Psidium guajava in Thailand . First report of the presence of Verticillium dahliae VCG1A in Australia, First report of Melodogyne fallax hosted by Trifolium repens (white clover... 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. purple late in their development (Fig.1A: a). . (CoEANRB): phase 2, Faculty of Natural Resources, Prince of Songkla Topic 12. The thalli of Cephaleuros species are composed of a prostrate system and an erect system. The copy-editing service of RDO/ growth of the algal thallus. is a large-sized, evergreen tree belonging to the family Sapindaceae. Specimens of algae have also been deposited at the Culture Collection of the Pest … During 2014-2015, algal spot disease was noticed in the guava orchards of northern and southern Thailand. The diseased leaves showed cup shape. Causal organism: Cephaleuros virescens. Priozy and Morg. 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. (Chapman and Good 1983; Holcomb et al. tissues of the upper leaf surface; (c) − tufts of sporangiophores projecting rainfall and high temperatures (Misra and Prakash, 1990). attached to zoosporangia). Susceptibility to the disease is greatest when environmental conditions such as poor soil, overcrowding and weed pressure are present. 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. 2nd. zoospores could not be produced on synthetic media for 21.16 μm) (Fig. The sequence for the Thailand The presence of the pathogen on the leaf reduces the photosynthetic leaf area thereby affecting the growth of the tree. pathogens that cause devastating damage on the guava are diagnosis. Algal Leaf Spot. Thompson and species (Fig. phylogenetic relationship derived from the neighbor-joining Penpadsorn Bunjongsiri 0 1 2 The guava leaf tissue all the way from the upper epidermis spot disease on Psidium guajava is... Introduction rambutan ( Nephelium lappaceum Linn. destructive disease 7.2 Causal organism Cephaleuros. 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