The spots may be circular or blotchy in shape, and are generally somewhat raised from the plant surface. Site Feedback @2020 Plant Pathology Department University of Florida Institute of Food and Agricultural Sciences. causing disease in Thailand. Anurag Sunpapao. 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. Fruit Canker (Restalotia psidii Pat.) Specimens of algae have also been deposited at the Culture Collection of the Pest Management Department, Faculty of Natural Resources, Prince of Songkla University, Thailand, for further studies. 2014). Leaf spot Curvularia lunata Leptosphaeria sp. Google Scholar, Hibbet DS (1996) Phylogenetic evidence for horizontal transmission of group I introns in the nuclear ribosomal DNA of mushroom-forming fungi. Bryopsis plumose represents the lack of similarity outside this group. Leaf tissues with algal thalii were then cross-sectioned and the sporangiophore, sporangia, gamete and zoospore observed. The causal organism is Cephaleuros virescens, a green parasitic alga whose usual hosts are plants with leathery leaves such as litchi, magnolias, hollies, rhododendrons and viburnums. 6318, 1–95 p, Chapman RL, Henk CH (1985) Observations on the habitat, morphology and ultrastructure of Cephaleuros parasticus (chlorophyta) and a comparison with C. virescens. Correspondence to Various genotypes of M. rosae, i.e isolates that infect a specific cultivar or group of cultivars, are currently present. Causal Organism of Guava Stem Borer. © 2021 Springer Nature Switzerland AG. Australasian Plant Disease Notes Para rubber (Hevea brasiliensis) is a tree belonging to the family Euphorbiaceae. This is also a fungal disease that affects the fruit and growth … An initial denaturation step for 3 min at 95 °C was followed by 35 cycles of denaturation for 30 s at 95 °C, annealing for 30 s at 50 °C, and extension for 1 min at 72 °C, with a final extension step of 10 min at 72 °C. Key words: Green algae, leaf spot, morphology, Nephelium lappaceum, rRNA INTRODUCTION Rambutan (Nephelium lappaceum Linn.) Plant Dis- PD-43, Pitaloka MK, Petcharat V, Sunpapao A (2014) Cephaleuros solutus Karsten, as a causal agent of durian (Durio zibethinus Murray) algal leaf spot disease in Thailand. This field is for validation purposes and should be left unchanged. Algal leaf spot is a foliar disease most commonly seen in warm, humid climates or in greenhouses. Bootstrap values are shown on the branches and the GenBank accession number are shown in parentheses. J Phycol 21:513–522, Article  IV. a) Leaf spot on Hevea braziliensis leaf, b) lesion caused by Cephaleuros on upper leaf, c) lesion on lower leaf surface, d) young thallus on upper leaf surface with sporangiophores, e) thallus with gametangia (G) and setae (Se), f) pseudoparenchymatous thalli of C. virescens, g) sporangiophores (SP) with the head cell (HC) and suffultory cell (SC) bearing sporangia (S) on the top, h) transverse section of leaf tissue show subcuticular and subepidermal growth of the thallus, cuticle (cu), epidermis (ep), palisade cells (ps) and i) gametes, Phylogenetic analysis of Thai Cephaleuros (C. virescens PSU-PR01) and other green alga (Trentepohliaceae, Chlorophyta) based on 18S rDNA sequences. 1990) primer pair. Cephaleuros is a parasitic Green Algae, living under leaf cuticle, causing Red Rust disease in Tea, & Mango; Algal leaf spot on Magnolia (Green Scurf) Structure of Cephaleuros Colony of Cephaleuros on Tea Groups of Plant Pathogens - Algae 19. The algae caused circular orange to dark brown lesions on both leaf surfaces. ALGAL DISEASE Algal stem blotch Cephaleuros virescens Kunze ex Fries BACTERIAL DISEASES Bacterial canker Pseudomonas syringae van Hall Bacterial leaf scorch Xylella fastidiosa Wells et al. Bacterial leaf spot Burkholderia andropogonis (Smith) Gillis et al. The record of Cephaleuros solutus on durian was the first record of Cephaleuros sp. Algae 29(2):121–126, Thompson RH, Wujek DE (1997) Trentepohlliales Cephaleuros, Phycopeltis and Stomatochroon, morphology, taxonomy and ecology, 1st edn. The disease results in poor guava growth and yield by causing lesions and dark spots on flowers, fruits, leaves, and stems. 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. A portion of 18S rDNA was amplified by PNS1 (Hibbet 1996) and NS8 (White et al. The morphology of the algae (thallus, filamentous cells, sporangiophore, sporangia, gametangia and zoospore) were examined and found to consistently match the species Cephaleuros virescens. predominantly occur in tropical and subtropical regions. Stem borer of guava is one of the group of insect pests that bore or feeds on the stem of guava plant and cause damage or reduce the growth rate and productivity of guava plant. Furthermore, C. virescens has been documented to cause algal leaf spot on rubber plants on the east coast of Sumatra (La Rue 1923). During 2014–2015, algal spot disease was noticed in the guava orchards of northern and southern Thailand. Algal Leaf Spot Algal leaf spot occurs on a wide range of tropical fruit species. Black spot is the most serious disease on roses in Florida. Cite this article. Leaf tissues are colonized beneath the epidermis by algal filaments, but host cells are not penetrated (Chapman and Henk 1985). 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