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And Stem Canker Diseases on Araucaria Heterophylla in Ethiopia

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And Stem Canker Diseases on Araucaria Heterophylla in Ethiopia Journal of Horticultural Research 2017, vol. 25(2): 15-18 DOI: 10.1515/johr-2017-0014 _______________________________________________________________________________________________________ FIRST REPORT OF LASIODIPLODIA THEOBROMAE CAUSING NEEDLE BLIGHT AND STEM CANKER DISEASES ON ARAUCARIA HETEROPHYLLA IN ETHIOPIA Short communication Wendu Admasu DARGE* Central Ethiopia Environment and Forest Research Center, Forest protection Process Addis Ababa, P.o. Box-30708, Ethiopia Received: April 2017; Accepted: October 2017 ABSTRACT Canker and needle blight of Araucaria heterophylla (Norfolk Island pine) trees were observed during the surveys conducted in Addis Ababa and Adama cities (Ethiopia) from November to December 2016. The main objective of this study was to investigate fungal pathogens that cause diseases on Araucaria heterophylla trees. Six localities with Araucaria heterophylla plantings were purposively surveyed for dis- ease symptoms. Samples from symptomatic parts of trees were collected, surface sterilized, cultured on PDA and morphologically identified for genus and species. A total of 36 isolates of fungi were identified. Based on macro- and microscopic morphological features of the colonies, the fungal isolates were found to be the genus Diplodia and species Lasiodiplodia theobromae (Pat.) Griffon & Maubl (syn. Botryodiplodia theobromae), the anamorph of Botryosphaeria rhodina (Berk. & M.A. Curtis) Arx. The pathogenicity test showed that the isolates of Lasiodiplodia theobromae, caused stem canker and needle blight on Araucaria heterophylla. This finding is important in the study of management options for future prevention and control of diseases in the country. Key words: Araucaria heterophylla, Lasiodiplodia theobromae, needle blight, stem canker INTRODUCTION Dick 2001). Lasiodiplodia theobromae is a com- mon endophyte and an opportunistic pathogen of Araucaria heterophylla is a distinctive conifer, more than 500 tree species in the tropics and sub- a member of the family Araucariaceae. Currently, tropics, also causing cankers and dieback of orna- it grows extensively all over the world in different mental plants, vegetable crops, perennial fruit and climate regions due to its pleasing appearance, fairly nut trees (Sulaiman et al. 2012; Úrbez-Torres et al. broad climatic adaptability as well as their ornamen- 2008; Hseu et al. 2008; French 2006; Khanzada et tal nature. The trees are planted either as single in- al. 2004). Golzar & Burgess (2011) also reported dividuals or in avenues of urban streets, and as in- that Diplodia species can cause canker and decline door plants (Patil et al. 2014). The growth of this diseases of the Norfolk Island pine in New Zealand tree is currently affected by infections caused by and Australia. Araucaria heterophylla is currently Phytophthora spp. manifesting with the wilt of among the exotic trees rapidly expanding in the re- plants and yellow discoloration of needles. Dying of cent years in Ethiopian cities like Addis Ababa and branches, red band needle blight and canker are also Adama at interior locations such as homes, apart- the symptoms of other diseases caused by the fungi ments, offices, public buildings, shopping malls and Dothistroma septosporum, Colletotrichum derridis urban streets, home gardens and parks; this makes and Lasiodiplodia theobromae, resulting in heavy them vulnerable to various stresses and susceptible defoliation of needles of trees of all ages (Ridley & to various infections (Ma et al. 2001; Slippers et al. *Corresponding author: e-mail: [email protected] Brought to you by | Uniwersytet Przyrodniczy w Poznaniu Authenticated Download Date | 10/12/18 10:24 AM 16 W.A. Darge _______________________________________________________________________________________________________ 2005; Dakin et al. 2010). The objective of this study sterile water) of the isolates were used for the test was to identify fungal pathogen associated with Ar- procedure. Needles were superficially disinfected aucaria heterophylla disease observed on plantings with 70% ethanol and rinsed with sterile distilled in Addis Ababa (8°50'−9°05' N and 38°39'−38°55' water, then sprayed with spore solution and kept in E, in the altitude ranging from 2350 to 3300 m humid plastic bags at room temperature. Sterile wa- above sea level), and Adama (about 100 km South ter free of fungal spores was used to spray the con- East of Addis Ababa with an average altitude of trol. Disease symptoms developed on the needles 1620 m above sea level). were recorded and fungus was re-isolated from the diseased host tissues to confirm identity with the in- oculated fungal isolates according to the procedures MATERIAL AND METHODS of Xue et al. (2004). Araucaria heterophylla trees in streets, parks, nurseries and interior locations (homes, apartments, RESULTS offices and public buildings) were surveyed from November to December 2016 for disease symp- The survey of Araucaria heterophylla plants toms. Diseased samples of needles and segments of grown in Addis Ababa and Adama cities showed se- stems with symptoms of blight and canker were col- vere needle blight and stem canker with brown color- lected from six localities. They were washed thor- ation as the most common disease symptoms (Fig. 1). oughly with tap water, cut into 1 cm long pieces, A total of 36 pure cultures of fungi colonies and surface sterilized with dipping in 90% ethanol assumed to be associated with stem canker and nee- solution. Then they were washed thoroughly with dle blight of Araucaria heterophylla isolated from sterile distilled water several times. Next, the pieces six localities (six pure cultures from each) were were transferred individually on potato dextrose characterized and identified. agar (PDA) in Petri dishes, and incubated at The mycelium of the isolated fungus grew vig- 25−30 °C for 7−8 days. The developed fungal colo- orously on the PDA. The dense aerial parts of my- nies were purified using hyphals or single spores. celia grew uniformly in all directions and fully cov- Micromorphological descriptions of mature conidi- ered the surface of the media within 3 to 4 days. The omata and conidia for 36 fungal cultures were car- color of the colony changed gradually from light ried out after 4 weeks of incubation using slides grey after four to seven days of incubation (Fig. 2 mounted in water following the methods described A) to black after 2 weeks of incubation. The bottom by Adeniyi et al. (2016). Colony colors on the sur- part of the fungus became darker only after 3 weeks face and reverse were assessed according to the of incubation. Subsequently, the fungus produced color charts (Rayner 1970). Fungal cultures were stromata and pycnidia. The pycnidia were initially identified at genus and species level based on mac- soft but hardened with the culture maturing at 4 roscopical (color, texture, shape and appearance) and weeks. The culture sporulated after 4 weeks of in- microscopical traits (conidia shape, hyphae color, cubation. Light microscope observations showed septation, concentric zone, pigmentation, fruiting that the fungus produced immature conidia with bodies) using identification keys of Agrios (2002), some distinct features. They were non-septated, Gezahgne et al. (2014), Sulaiman et al. (2012). thick cell-walled, oval in shape and hyaline. How- Pathogenicity of fungal isolates was tested us- ever, the mature conidia were septate, oval-shaped ing detached leaf techniques of respective host and brown in color with the presence of irregular plants. Conidial suspensions (2 × 103 conidia ml-1 of longitudinal striations (Fig. 2 B). Brought to you by | Uniwersytet Przyrodniczy w Poznaniu Authenticated Download Date | 10/12/18 10:24 AM Lasiodiplodia theobromae on Araucaria heterophylla in Ethiopia 17 ____________________________________________________________________________________________________________________ A B C D E F Fig. 1. Stem canker and needle blight due to pathogenic fungi on Araucaria heterophylla (A, B, C, D, E, F), Adama and Addis Ababa cities A B Fig. 2. Fungal cultures from Araucaria heterophylla on PDA (A) and conidia (B) after 7 days showing Lasiodiplodia theobromae The morphological features of all fungal iso- Lasiodiplodia found in the tropics with conidia, sim- lates were typical to the genera belonging to Diplo- ilar to those described for L. theobromae in shape, dia. Based on microscopic morphological features color and striation, as reported by Adeniyi et al. of the fungal conidia, all the isolates were further (2016). Pathogenicity test using spore suspension of identified to species level as Lasiodiplodia theobro- L. theobromae isolates on the A. heterophylla needles mae. There were no significant differences in mor- revealed their pathogenicity, showing typical symp- phology and in the rate of mycelia growth among toms of the disease after 10 days of inoculation. The the isolates, regardless of place of origin. re-isolation of the pathogen using standard procedure These morphological characteristics were confirmed their affiliation to the L. theobromae. identical with the description of Lasiodiplodia the- According to the studies by Dakin et al. (2010) obromae (Pat.) Griffon & Maubl (syn. Botryodiplo- and others, trees which are under environmental stress dia theobromae), the anamorph of Botryosphaeria or with mechanical injuries can be vulnerable to attack rhodina (Berk & Curtis Arx described by Gezahgne by opportunistic fungal pathogens such as Diplodia re- et al. in 2014). Another important
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