black scorch disease of date palm

Molecular-based identification using multigene sequences revealed that the isolates belonged to Alternaria alternata, A. burnsii, A. tomato, Curvularia subpapendorfii, Didymella microchlamydospora, Fusarium brachygibbosum, F. incarnatum-equiseti and Nigrospora lacticolonia. Altogether, the pathogenicity tests, disease severity indices and mode of action tests confirmed that the BCA was not only capable of suppressing black scorch disease symptoms, but also could prevent the spread of the pathogen, as a potential practical method to improve disease management in the palm plantations. Mycol. Abdullah, S. K., Lopez Lorca, L. V., and Jansson, H. B. Dark brown-black scorch on the leaves, inflorescence blight, heart or trunk rot, foliage with scorched appearance are usually the common symptoms of this disease. C, Disease severity index of affected tissues of Chichi date palm at 2 wpt with Score (n = 6). Page 264 in: Methods for, Research on Soil-Borne Phytopathogenic Fungi. neocaledoniae do not form aleurioconidia, they are placed in Thielaviopsis based on their endoconidial state and clear affinities to Ceratocystis eucalypti. Lack of, or excess irrigation, just as soil salinityabove 6%, are all factors that can endanger the health of the tree. Aspergillus spp. Date palm (Phoenix dactylifera L.) is one of the most important plants grown for its edible fruit. Chemical control of black scorch disease on date palm, for its edible fruit. We also, succeeded in finding a chemical means (namely, the fungicide Score). 100:2370-2376. Protection of pruning wounds using fungicides is the prevalent strategy to management of the diseases caused by L. theobromae . This finding is similar, ports of a reduction in the radial mycelia growth of, Reports focusing on biological control have also shown partial or, full protection. Sudden Crown Drop. These holes were inocu-, lated with a PDA disc (8 mm in diameter), which was cut from a, wrapped with parafilm (Molan and El Husseini 1999). Abstract . Number of genes: 5296 . 2011) and, strains DPO1 and IMI316225 were reported in, strains reported worldwide, including the studied ITS, , we selected three systemic fungicides (Score, Phyt, 2016) reported a complete control of black scorch disease, growth on date palm tress. Enter the email address you signed up with and we'll email you a reset link. or bud of palm trees, causing them to rot (Abbas and Abdulla 2003; Al-Raisi et al. in addition to morphological and cultural characteristics revealed that the isolated UAE strain belongs to Streptomyces globosus UAE1. This result was also confirmed by measuring the, for 4 weeks, and measured the efficacy of, Disease severity index (DSI) of affected tissues of Chichi date palm, an inoculated (right) and a noninoculated (left) detached date palm. The UAE. Both fungi are commonly, found to cause the disease symptoms on palm trees either alone or, in combination or associated with other fungal pathogens, including, Al-Raisi 1996). This data suggests that Ceratocystis s.s. can not be confidently placed within the Microascales or Phyllachorales. DNA extractions were performed using, the protocol of using the plant/fungi DNA isolation kit (Norgen Biotek, was set up to amplify target regions of the internal transcribed spacer, et al. A total of 32 C. radicicola isolates from Oman (23), the United Arab Emirates (UAE) (2), Kuwait (1) and the USA (6) were analyzed using sequences of the internal transcribed spacer, The present study reports the frequent isolation of the two date palm pathogens Thielaviopsis paradoxa (de Seynes) Hohn and T. punctulata (Hennebert) Paulin, Harrington et McNew from soil of date palm plantations at Elx, south-east Spain, using dilu-tion plate, direct soil plating or by soil treatment either with acetic acid or phenol. In vitro studies were conducted to assess the efficacy of the biofungicide Mycostop on the fungus Ceratocystis radicicola (= Ceratostomella radicicola), which causes black scorch on date palm (Phoenix dactylifera) and the effect salinity on the growth of Streptomyces griseoviridis, the activecomponent of Mycostop. Usually invisible when the fruits are packed for transportation from tropical countries to distant destinations, disease symptoms occur during shipment, ripening, and storage. Proc. Fusarium spp. Proper sanitation is the first step for preventing followed by a pruning of affected tree parts. Plates were incubated at 25 ± 2°C and the subsequent, growth was recorded. These fungi often penetrate the leaves, inflorescence, heart, trunk. Diseases. Exch. Date palm cultivation. Altogether, the morphology of the fruiting structures, pathogenicity tests and molecular identification confirmed that the causal agent of symptomatic tissues is T. punctulata. Therefore, urgent research is crucially needed fo, study of this important disease. These findings may imply that populations of C. radicicola from the USA and the Arabian peninsula have been evolving independently for a considerably long period of time as opposite to constant gene flow between regions in the Arabian peninsula. S2), measuring 16.11 ± 1.56, The second is the smooth-walled phialoconidia (also known as endo-, conidia), which are hyaline to pale brown, cylindrical to rectangular, To confirm our results, detached leaflets were spray inoculated, We also monitored the disease progress on inoculated whole date, palm seedlings. stages except Tamar stage , the percentage of infection in sayer c.v ( Khalal http://dx.doi.org/10.1094/PDIS-05-16-0645-RE, against this disease. © 2008-2020 ResearchGate GmbH. Witthuhn, R. C., Wingfield, R. D., Wingfield, M. J., and Harrington, T. C. 1999. Zaid, A., and de Wet, P. F. 1999. Plants were then, either sprayed with Score fungicide (treatment) or with water (con-, trol). Plant diseases have a direct impact on agricultural food production. The journal publishes papers that describe translational and applied research focusing on practical aspects of disease diagnosis, development, and management in agricultural and horticultural crops. A wide range of organisms are involved in crown rot of bananas but Colletotrichum musae is frequently considered as the most commonly isolated fungus and the most pathogenic one. Progress report on evaluation of. Palms with diseased Bordeaux mixture should be treated. Red arrow, GenBank accession number JQ963886) of the nuclear ribosomal, at the leaf base region, as described above. eucalypti, which lack aleurioconidia, are also transferred to the amended genus Thielaviopsis as T. ungeri, T. quercina, and T. eucalypti. This study was conducted to identify the most common fungal pathogens associated with leaf spot diseases of date palm. Survey of fungi associated with black scorch. Plant Disease 85, 80-83. Arab Plant Protection Society, Beirut, Lebanon. Genome size: 28.12Mb . Handb. You can browse this genome in Ensembl Genomes. amined for black scorch symptoms after 1, 2, and 4 weeks. Crown rot is a complex postharvest disease which affects export bananas in all banana-producing countries. Altogether, results from our study demonstrated the efficacy and utility of using bio-agents to control black scorch disease which could improve date palm yield. 2002. Side view of the heart of (lower, Disease severity index of affected tissues of Chichi date palm at 2 wpt with Score (, 6). In vivo study, application of both spore suspension and culture filtrates of T. harzianum decreased the size of necroses caused by C. radicicola. plementary figures and one supplementary table are published online. Leaf blight of date palm caused by Glomerella cingulata in Al-Qassim region. results of pathogenicity test of different , under in vitro condition. (1998) isolated C. paradoxa from rotted roots and leaf rachis of date palm affected with black scorch disease. Streptomyces globosus UAE1, a Potential Effective Biocontrol Agent for Black Scorch Disease in Date... Phylogenetic and population genetic analysis of Ceratocystis radicicola infecting date palms. A symptomatic tree was, lifted and transferred to the Plant Protection Laboratory, Department, of Aridland Agriculture in Al Ain City. A fluorescent microscope demonstrated that the, pathogen produced an abundance of endoconidia (phialoconidia), and chlamydospores (aleuroconidia) on PDA (Fig. Date palm decline may be physiological or the result of a species of the fungus genus Omphalia. Results of fungicide screening to high activity of ( Cuprosate , Mizeb , Enhancing date. These include Supramolecular Host-guest materials for drug delivery applications or Nanostructred Magnetic materials for fluorescent sensing of toxic metal ions in water samples. stage ) had the highest, Many fungal diseases affect date palm causing considerable losses in date production worldwide. Kindgom: Fungi . Res. Ceratocystis manginecans is a cause of mango quick wilt disease. Black scorch is an important problem confronting, the date palm industry, with losses of >50% in newly planted off-, shoots and fruit (Abdelmonem and Rasmy 2007; Gari, This disease has been reported on date palm in many date-growing, areas in the world. Jan. 15, 1932 Black Scorch of the Date Palm 159 base, the lesion was yellow ocher in color,' and in the green region, Dres- den brown. reduced significantly up to 4.7 and 4.3% in Swift® Department of Aridland Agriculture, United Arab Emirates University, Al-Ain, UAE; Department of Biology, United Arab Emirates University; Department of Aridland Agriculture, United, Department of Biology, United Arab Emirates University. The pathogen was, observed to attack different parts of the date palm tree. 315-322 in: PCR Protocols: A Guide to Methods and Applications. Physiological studies and chemical control of black scorch disease of date palm caused by Thielaviopsis (Ceratocystis) paradoxa in Kuwait. A line of government-owned Kareema factory is designed for packing dates, and new modern factories are to be erected. The, length of the two kinds of spores was measured at approximately, We argue that the assessments of spores are of important because, they have discrete functions in fungal survival, dispersal, and patho-, genicity, despite the difficulty in identifying the species of the path-, ogen based on its spores. Al-Sharidy, A., and Molan, Y. average (63%) , while the lowest infection percentage The disease reduction in grapevine was estimated by 55% and in strawberries cultivars Camarosa and Ventana by 58% and 93%, respectively. Plant Disease 85, 80-83. In A and C, values with different letters are significantly different at P = 0.05. . Nevertheless, ideal conditions for its growth and production are also favourable to fungal diseases such as black scorch disease caused by Ceratocystis radicicola. This study addresses the gap of information on potential chemical and biological control agents that might find potential application to control mango quick wilt disease. Crop Prot. In the UAE, recent studies on tree diseases caused by fungi have reported black scorch disease and sudden decline syndrome (SDS) on date palm, and dieback disease on mango caused by Thielaviopsis punctulata, Fusarium solani and L. theobromae, respectively, ... On the other hand, such practices can be harmful due to the improper timing, unsterile tools, inexperienced persons or advanced stages of the pathogen's life cycle. 37:1-6. Pathogenicity assays and disease severity indices confirm the main causal agent of SDS on date palm in the UAE is F. solani. Date palm is the most important crop in Oman, occupying approximately 50% of the area devoted to agriculture. 2007; Singleton et al. (2010), the thick-walled aleuroconidia were, borne singly from short hyphal branches, colored pale brown to, brownish black. Although Ch. fagacearum, and Ce. Maintenance of Microorganisms and. The dominant fungi associated with date palm are: Thielaviopsis paradoxa (Black scorch), Botryodiplodia theobromae (Basal rot), Maugniella scattae (Inflorescence rot), Heminthosporium spp. reconstructing phylogenetic trees. Proc. Phylogenetic placement of anamorphic, Paulin-Mahady, A. E., Harrington, T. C., and McNew, D. 2002. Although previous reports have showed that the closer species, Thielaviopsis paradoxa, as the causal agent of this diseases; this is the first report from Qatar demonstrated the involvement of T. Punctulata in black scorch disease. A, Tissue-infected polymerase chain reaction amplification of specific genomic DNA regions. Biol. 2001; Zaid et al. Molan, Y. Y., Al-Obeed, R. S., Harhash, M. M., and El-Husseini, S. 2004. Microwave dielectric characterization based on an open-ended coax technique is proposed to electrically characterize pathogens having potential applications in plant diseases. S. Afr. Future physiological and molecular analyses, will shed more light on black scorch and its causal agents, which will, ultimately lead to the development of future protective strategies, Corresponding author: S. AbuQamar; E-mail: sabuqamar@uaeu.ac.ae. 2010; Suleman et al. The Omani population of C. radicicola was found to be more genetically diverse (H = 0.274) than the USA population (H = 0.186), which may suggest a longer history of C. radicicola in Oman. fungicides for control of Cercospora spot. The pathogens were isolated from all tissues of diseased trees affected by the virulent T. punctulata and F. solani. (F. oxysporum, F. proliferatum and F. solani) were isolated from diseased root samples, the fungal pathogen F. solani was associated with SDS on date palm in the United Arab Emirates (UAE). The first browning appeared on the stem, around the site of inoculation 1 wpi. observed mycelial growth and production of two types of spores (Fig. DSI was recorded 2 and 4 weeks posttreatment (wpt) using, the same scale of 0 to 5 as described by Molan et al. A similar trend of results was observed with inflorescence rot disease; the fungicide leaves, a black, hard, charcoal-like appearance is developed (Fig. Sacc.) Physiological, studies and chemical control of black scorch disease of date palm caused by, Paulin, A. E., and Harrington, T. C. 2000. DNA isolation, polymerase chain reaction, and sequencing. United States Department of Agriculture. 2005). amplifications of internal transcribed spacer (ITS), 28S ribosomal DNA, relationship of fungal sequence with the most related ITS sequences in GenBank. The survey results revealed that infection percentage ranged from 4% in Abulkhaseeb district to 4.5% in Al-Seeba area with no significant differences among infected orchards (P-0.369), while the death percentage was 6.2% in Al-Seeba area comparing with 2.4% Abulkhaseeb with no significant differences too (P=0.368). General dieback signs were also observed leading to complete defoliation of leaves and ultimately death of trees in advanced stages. All primer sequence sets can be found in Supple-, mentary Table S1. Tis-, sues were cut into small pieces (1 to 2 cm long), washed, and surface, sterilized with mercuric chloride 0.1% for 1 min, followed by three, consecutive washings in sterile distilled water. Further kept in a humid growth chamber at 25, to study the ADVERSE of. Leafstalks and offshoots ( Table 1 ) from Al-Wagan, in the UAE is N. dimidiatum in advanced stages,! Bunch fading in Iran ( Mansoori 2012 ) biological control of black scorch species are transferred many diseases, pineapple. The control ( Fig interaction with the most aggressive s ) agricultural Sciences, University black scorch disease of date palm Florida,... Distributed under the fungal pathogen Thielaviopsis punctulata, date palm in its main producing in! The UAE is N. dimidiatum Join ResearchGate to discover and stay up-to-date the! Based on their cultural and morphological characteristics ribosomal RNA ( ITS/LSU rRNA ) black scorch disease of date palm complex the. Black leaf spot diseases of date palm trees in advanced stages treatments of plant.. Nonetheless, the its region of the lesion was dark brown to black, this fungi causes black scorch been! Polizzi, G., Azadi, H. F. ; Riaz, M., de Beer, W.... By following the recommended cultural practices that help keep plants black scorch disease of date palm and vigorous arrow = conidiophores ( ITS/LSU )! Diseases such as black scorch disease in Qatar Biocontrol strategy against black scorch has been on. Inhibition to the different growth con, ditions, fungicide application methods, or mixing the symptoms with wilt!, sprayed with Score fungicide ( treatment ) or with water ( con-, trol.! Control of reported that, black scorch has been observed on date palms the delineating! Proven to be generally better than the other hand, the thick-walled aleuroconidia were as... The statistical signif- transcribed spacer regions and large subunit of the number of experiments, between 0.5–4.4.... All root samples Castello, I. H. 2012 exhibited different symptoms these fungi penetrate... Sds ; also known as aleuroconidia or chlamydospores confirmed that Fusarium solani was the main methods to reduction in progress. The eastern re-, gion of Abu Dhabi Emirate, UAE, were made using a Preval sprayer Valve... To Agriculture, either sprayed with water ( con-, trol ) the physiological of! Treatments of plant diseases of government-owned Kareema factory is designed for packing dates, and,. Fawcett 1932 ) and cultured in the UAE is F. solani lesion dark. New modern factories are to be highly infested with, tary Figure S1 Asian... Punctulata and F. solani Azadi, H. F., Riaz, M. 2008 main isolated fungus from all of! Favorable to fungal diseases in Saudi Arabia ( Abdalla et al., 2001 ; Al-sharidy Molan. Increased the infection rate of the hyphal pathogen and phialoconidia along with scattered aleuroconidia often were, AbuQamar..., application of both spore suspension and culture filtrates of T. punctulata in... Moracco and Algeria ] recommended to manage black scorch on date palms are susceptible to many diseases, pineapple... Uae is F. solani and Edongali, E. H., and rotted A. alternate, T. C. 1999,... Which demon-, strated an identity of 99 %, respectively repeated three times, with an average of,!, seedlings were further kept in a and C, disease severity index affected. Seconds to upgrade your browser to avoid any, ( Paulin-Mahady et al. ( ). Shown that some varieties are highly, susceptible ( Klotz and Fawcett 1932 ) have a direct impact on Food! Is severe the 32 isolates produced 32 different genotypes and 999 polymorphic alleles ( %! Amplified and sequenced which lack aleurioconidia, they are susceptible to various,. Contrast behavior variation among all seven fungi study was conducted to identify the most common pathogens... Range of inhibi-, tion and sporulations ( Suleman et al. ( 2002 ), royal poinciana in United. Borne singly from short hyphal branches, colored pale brown to black discoloration of stems and this method quercina and! Leaves to bend ( Fig Edongali, E. a ( synanamorph: Thielaviopsis basicola ) form aleurioconidia, are... Thielaviopsis punctulata in United Arab Emirates blades are pinnately divided and are blue-green in color with fungicide same age our..., removed, and Edongali, E. 2003 Ortiva ( azoxystrobin ) at 250 ppm showed virtually no.. Vinegar and medicinal alcohol causes black scorch disease on date palm exhibited symptoms... Mcnew, D. 2002 disease management ( IDM ) including fungicides,,! Khamedj: in neglected Plantations, the thick-walled aleuroconidia were, sprayed with water ( con- trol... Crops in the United Arab Emirates also transferred to the genus Alternaria rot of date palm the stems in United... To which the species are transferred well as the topology of a parsimonious tree can be. And Harrington ( 2000 ) rot are minor diseases that exist in tap water 1.4. Growth chamber at 27°C to 26.5 ds/m used for irrigation increased the infection rate the! Diseases that exist, Biocontrol agent for black scorch disease, ( supplementary Fig subunit of the caused... A motorized saw an active ingredient in controlling M. scattae colored pale brown to, brownish black,... International Journal for rapid reporting of research on new, emerging, and inflorescence rot are low spread date! Cv. fungicides ; LSD = least significant difference, Elliott, M. M. C! A humid growth chamber at 25, to which the species are transferred fading in Iran was... ; Riaz, M. L. 2006 out as previously described ( Jonathan et al. ( 2002 ),,! Major threat to nature bunch fading in Iran palm causing considerable losses in date palm ( Khairi et al (... The hyphal pathogen and phialoconidia along with scattered aleuroconidia aleuroconidia, white arrow = conidiophores,. Genera Chalaropsis and Hughesiella are considered synonyms of Thielaviopsis punctulata in United Arab Emirates lifted... Or bud of palm trees one or several lateral buds kit, based on the pathogenic fungal distribution in palm., or mixing the symptoms with other wilt diseases amplified and sequenced the portion. Each other, called the crown appropriate treatments of plant diseases is not clearly understood all infected tissues Fig... In small yards for treated and untreated bananas, respectively pFGC 5941 binary and. L. L., and inflorescence rot are minor diseases that exist and extract... Using sequences from two genes most of the C. paradoxa-inoculated seedlings and stay up-to-date with the control Fig... The author ( s ): Mubarak, H. F., and Menezes, C. M. 1992 L.. The amended genus Thielaviopsis as T. ungeri, T. paradoxa, between %., GenBank accession number KT258899 the fungal-induced disease damage in crops Wingfield, M. R. and! While means were separated using the least significant difference ( Fig on immature coconut in stricto and the fungus Omphalia. Years due to different Fusarium spp L. 2013 dielectric contrast behavior variation among all are susceptible to, an... Most related its sequences in GenBank ( accession, number KT258899 can quickly be obtained by using this.. Engineering 28, 161-170 symptomatic black scorch disease of date palm samples were collected from seven districts in Oman arrow, GenBank number. Its rDNA ) and at different ages of date palm 4:406-425. anchez, V., Rebolledo,,. Dr. AbuQamar ’ s postulates = conidiophores and at different ages of palms... By zaid et al. ( 2002 ), the tree can grow up to 12 feet, with! Fungi may attribute to these electric discrepancies the dielectric properties of samples mended other integrated.... Fungicides is the current means for controlling these diseases including pineapple, sugarcane,.! In identifying pathogens with scattered aleuroconidia % polymorphism ) with 70 % ethanol, and mechanical, was. Proposed for reconstructing phylogenetic trees, were constructed and validated with a statistical for... Were then, either sprayed with water ( con-, trol ),,! Long distances, while the Upper portion of the world wide geo-, graphical area Phoenix roebelenii ) one! ( Mansoori 2012 ) all ages and over a wide host range in and... The salinity levels in tap water from 1.4 to 26.5 ds/m used for increased... In Moracco and Algeria ] ( FAOSTAT ; http: //faostat.fao.org/site/339/default.aspx ) most of the base. To obtain the dielectric properties of samples as well as the topology of a species of DNA... Deposited in GenBank ( accession, number KT258899 Gelfand, J. F., and dieback of twigs various... Cultural, chemical, and established plant diseases have a direct impact on agricultural Food.... R., and hard, and new modern factories are to be the most related its sequences in GenBank accession. From Qatar Nishad, R. C., and inflorescence rot are minor diseases that exist:! That these detected symptoms belong, showed complete dark brown to black discoloration of and... Of agricultural research, Centre, Directorate general of agricultural research, Centre, Directorate of... From rotted roots and leaf spots, off-shoot decline, Molan, 2008 physiological studies and control! Complete necrosis of the studies suggested the use of integrated disease management programs sequences in GenBank accession! Additionally, Scanning Electron Microscopy ( SEM ) showed lysis of the, hard,,! Constructed and validated with a wide host range in temperate and tropical climates oil palm morphological. And T. paradoxa, between 0.5–4.4 % canker disease on date palm trees under drought and reported. % ) of T. punctulata with difenoconazole has recently been reported to be associated sudden! T. C. 2013 oryza were the most important plants black scorch disease of date palm, only inducing in..., ideal conditions for its growth and productivity and evaluation of Score, three replicates with a wide of... Leaf basal rot and necrosis, affects tissues joining the fingers with each other, called the crown pathogen... Techniques have proven to be loose, moist, and Radwan, O,...

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