The spots may be circular or blotchy in shape, and are generally somewhat raised from the plant surface. The presence of the pathogen on the leaf reduces the photosynthetic leaf area thereby affecting the growth of the tree. Symptoms of the disease occurred on the leaves and fruit. Algal leaf spot is most visible when it affects leaves, but it also regularly affects twigs and branches and sometimes fruit. The authors gratefully acknowledge the copy-editing service of Research and Development Office of PSU, and the helpful comments by Dr. Alan Geater, we appreciate it. The associated algae were identified as Cephaleuros parasiticus by morphological examination and DNA sequence analysis. Besides this, fruit and post harvest diseases are also important which causes serious loss. Cephaleuros spp. The causal organism is a green parasitic alga whose usual hosts are plants with leathery leaves such as cotoneasters, magnolias, hollies, rhododendrons, and viburnums. The spots are generally 1/2 inch or less in diameter although they may coalesce to form larger colonies. This is the first report of algal leaf disease on M. indica in Cameroon. The Causal Organism of Algal Leaf Spot Algal leaf spot is caused by green algae called Cephaleurus viresceus Kunze. To summarize the main results, the plant parasite causing algal leaf spot was identified as Cephaleuros virescens, and in sequencing-based phylogenetic analysis the Cephaleuros PSU-R5.1 isolate from rambutan grouped with the algae in genus Cephaleuros. University of Texas Publication. causing disease in Thailand. The black spot symptoms start as small black spots on the upper surface of the leaves. Based on the leaf symptom and morphological characteristics of the algae as described in Fig. Xylella fastidiosa Wells et al. ... 9.2 Causal organism This leaf spot is caused by Pestalotia jodhpurensis. https://doi.org/10.1007/s13314-015-0158-1, DOI: https://doi.org/10.1007/s13314-015-0158-1, Over 10 million scientific documents at your fingertips, Not logged in The nucleotide sequence analysis of the Cephaleuros 18S rRNA using BLAST search revealed that our partial sequence was 707 bases long. This confirms C. virescens as a causal organism of algal leaf spot disease on rambutan in southern Thailand. Algal leaf spot is a foliar disease most commonly seen in warm humid climates or in greenhouses. Algal leaf spot is sometimes called green scurf because the spots may have a crusty, fuzzy or flaky appearance. Various genotypes of M. rosae, i.e isolates that infect a specific cultivar or group of cultivars, are currently present. Phycologia 48(4):213–236, Suto Y, Ganesan EK, West JA (2014) Comparative observation on Cephaleuros parasiticus and C. virescens (Trentepohliaceae, Chlorophyta) from India. Anthracnose is a general word used to describe different varieties of diseases that cause damaging effects on vegetables, fruits, and trees. Parasitic algae are a foliar disease most commonly seen in warm humid climates or in greenhouses. In this article, we are going to discuss the causal organism, symptoms, management, and preventions of the algal leaf spot of guava. Hendersonia rot Hendersonia creberrima. Furthermore, C. virescens has been documented to cause algal leaf spot on … A PCR product band about 700 bases was observed from Cephaleuros sample. Wilt is the most important disease of guava. The edges of the spots may be wavy or feathered. The spots are initially circular, slightly elevated and later coanesce to form irregular spots. The record of Cephaleuros solutus on durian was the first record of Cephaleuros sp. Copper Oxychloride is for the control of fungal and bacterial diseases in fruit and vegetable crops, citrus, stone fruit, pome fruit… Read More. Morphological characteristics of the Cephaleuros spp. 2). The vegetative and reproductive structures of the causal agent of the disease were visualized in optic microscope (40×), being observed mycelia, composed for zoosporangiophores and characteristic zoosporangia of the algal, checking with the description and illustrations of literature, told for C. virescens Kunze. syringae; P. cichorii. It is commonly cultivated in tropical and sub-tropical areas and is an economically important source of natural latex rubber. This is also a fungal disease that affects the fruit and growth … The morphology of the algae (thallus, filamentous cells, sporangiophore, sporangia, gametangia and zoospore) were examined and found to consistently match the species Cephaleuros virescens. Notes 10, 4 (2015). 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. Khon Khaen Agric J 42(suppl3):644–648, Suto Y, Ohtani S (2009) Morphology and taxonomy of five Cephaleuros species (Trentepohliaceae, Chlorophyta) from Japan, including three new species. The authors would like to thank the Center of Excellence in Agricultural and Natural Resources Biotechnology (ANRB-CoE), Faculty of Natural Resources and Prince of Songkla University for funding and facilities. ALGAL LEAF SPOT. Cephaleuros spp. causal agent of algal leaf spot of camellia, southern magnolia, and other shrubs although southern magnolia and camellia are the most common hosts. In this study Cephaleuros virescens was found to be the causal organism of a leaf spot disease on Para rubber (Hevea brasiliensis).The algae caused circular orange to dark brown lesions on both leaf surfaces. Dept of Horticultural Science | 2721 Founders Drive | Raleigh, NC 27695 | Phone: (919) 515-1240 1, and comparison in Table 1, 15 alga samples were identified as Cephaleuros virescens. The disease does not cause severe economic loss. A 94 % sequence identity confirmed it to be a member of the Cephaleuros group. is a large- sized, evergreen tree belonging to … The disease is characterized by initial green coloured patches, as and when disease advances the organism turns red rusty spots on the leaves and young twig. 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