Diagrammatic Scales for Assessing Brown Eye Spot (Cercospora coffeicola ) in Red and Yellow Coffee Cherries

2016 ◽  
Vol 164 (10) ◽  
pp. 791-800 ◽  
Author(s):  
Paulo V. A. Azevedo de Paula ◽  
Edson A. Pozza ◽  
Leandro A. Santos ◽  
Eugênio Chaves ◽  
Matheus P. Maciel ◽  
...  
Keyword(s):  
Cercospora Coffeicola ◽  
Brown Eye Spot

scholarly journals PHIALOMYCES MACROSPORUS REDUCES CERCOSPORA COFFEICOLA SURVIVAL ON SYMPTOMATIC COFFEE LEAVES

2019 ◽  
Vol 14 (1) ◽  
pp. 1
Author(s):  
Marie Caroline Ferreira Laborde ◽  
Deila Magna dos Santos Botelho ◽  
Gabriel Alfonso Alvarez Rodriguez ◽  
Mário Lúcio Vilela de Resende ◽  
Marisa Vieira de Queiroz ◽  
...  
Keyword(s):  
Plant Pathogens ◽  
Disease Rate ◽  
In Planta ◽  
Necrotrophic Pathogen ◽  
Initial Inoculum ◽  
Saprobe Fungi ◽  
Cercospora Coffeicola ◽  
Brown Eye Spot

<p>Saprobe fungi and necrotrophic pathogens share the same niche within crop stubble and the search for fungi non-pathogenic to plants that are able to displace the plant pathogens from its overwintering substrate contributes to the disease management. Brown eye spot (<em>Cercospora coffeicola</em>) is among the most important coffee diseases, it is caused by a necrotrophic pathogen that has decaying leaves as its major source of inoculum. We have screened saprobe fungi for the ability to reduce <em>C. coffeicola</em> sporulation and viability and determined the possible mechanisms involved in the observed biocontrol. A selected saprobe fungus, <em>Phialomyces macrosporus</em>, reduced the pathogen’s viability by 40% both <em>in vitro</em> and <em>in vivo</em>. The fungus acts through antibiosis and competition for nutrients. It produced both volatile and non-volatile compounds that inhibited <em>C. coffeicola</em> growth, sporulation, and viability. It also produced the tissue maceration enzyme (polygalacturonase), which reduces the pathogen both in detached leaves or in planta. The reduction in the fungal viability either by the saprobe fungus or its polygalacturonase-fraction supernatant resulted in the reduction of the disease rate. Therefore, <em>P. macrosporus </em>is a potential microbial agent that can be used in an integrated management of brown eye spot through the reduction of the initial inoculum of the pathogen that survives and builds up in infected leaves.</p><p> </p>

scholarly journals Screening coffee genotypes for Cercospora coffeicola resistance in Brazil

2021 ◽  
Author(s):  
Juliana Barros Ramos ◽  
Mario Lucio Vilela de Resende ◽  
Deila Magna dos Santos Botelho ◽  
Renata Cristina Martins Pereira ◽  
Tharyn Reichel ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Defense Mechanisms ◽  
Genetic Resistance ◽  
Germplasm Collection ◽  
Cercospora Coffeicola ◽  
Superior Genotypes ◽  
Coffee Plants ◽  
Low Levels ◽  
Soluble Lignin ◽  
Brown Eye Spot

Several efforts have been made by many researchers worldwide to develop coffee plants resistant to different Cercospora species; however, studies concerning C. coffeicola , specifically, are still incipient. In the present study, a blend of strains from this pathogen was inoculated into 18 Brazilian commercial cultivars, a coffee clone of Arabica, as well as into 41 accessions from the Germplasm Collection of Minas Gerais, to evaluate the genetic resistance ability within the population and select superior genotypes for the breeding program. After predicting genotypic values of the evaluated material, the most efficient way to select genotypes based on the data of severity to brown eye spot (BES) was also examined. Moreover, the action of defense mechanisms against C. coffeicola attacks was investigated by assessing the levels of total soluble phenolic compounds and soluble lignin in contrasting genotypes regarding disease susceptibility. Based on the results, the accession MG 1207 Sumatra demonstrated an intrinsic genetic capacity to maintain low levels of severity to brown eye spot. This genotype can thus substantially contribute to the development of new cultivars, which may lead to reduced use of pesticides. This study also evidenced that four evaluations of severity is enough to reach accuracy and efficiency for the severity of BES, thus providing expressive genetic gains. Finally, it is suggested that the levels of lignin and phenolic compounds are not associated with the resistance of coffee genotypes to brown eye spot.

scholarly journals Effect of Center-Pivot Irrigation in the Rust and Brown Eye Spot of Coffee

Plant Disease ◽  
2014 ◽  
Vol 98 (7) ◽  
pp. 943-947 ◽  
Author(s):  
Adriano Augusto de Paiva Custódio ◽  
Edson Ampélio Pozza ◽  
Anselmo Augusto de Paiva Custódio ◽  
Paulo Estevão de Souza ◽  
Luiz Antônio Lima ◽  
...  
Keyword(s):  
Minas Gerais ◽  
Water Levels ◽  
Water Application ◽  
Hemileia Vastatrix ◽  
Irrigation Methods ◽  
Class A ◽  
Center Pivot ◽  
Cercospora Coffeicola ◽  
Evaporation Pan ◽  
Brown Eye Spot

Incidence of rust (caused by Hemileia vastatrix) and brown eye spot (caused by Cercospora coffeicola) of coffee was evaluated for 2 years in southern Minas Gerais, Brazil, in a center-pivot-irrigated coffee crop with different water application levels. Treatments consisted of six water levels of 0 (nonirrigated), 60, 80, 100, 120, and 140% applied according to class A evaporation pan (CAE). Progress of disease was influenced significantly by different water levels; the highest incidence of rust occurred with lower water levels—0 (nonirrigated), 60, and 80% CAE—whereas the lowest incidence was detected with larger water levels: 120 and 140% CAE. There was one peak of rust incidence in August. The highest incidence of brown eye spot occurred with water levels of 100 and 140% CAE and the lowest incidence was found in the nonirrigated treatment. Two incidence peaks occurred in March and June. This study identified that irrigation methods and water levels can decisively affect the epidemiological behavior of diseases and, therefore, their management.

Cercospora coffeicola. [Descriptions of Fungi and Bacteria].

1974 ◽  
Author(s):  
J. L. Mulder
Keyword(s):  
Geographical Distribution ◽  
Leaf Surface ◽  
Lower Surface ◽  
Cercospora Coffeicola ◽  
The Tropics ◽  
Brown Eye Spot

Abstract A description is provided for Cercospora coffeicola. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Coffea spp. DISEASE: Brown eye spot of coffee; symptoms occur on leaves and berries. On the former the small chlorotic spots expand, becoming deep brown but lighter in colour on the lower surface; the centre becomes grey white and surrounded by a ring of dark brown tissue, 5-15 mm diam., sometimes with a yellowish halo. This is most distinct on the upper leaf surface; the dark sporulation is seen in the greyish area. Leaves may be shed. On green berries lesions are brown, sunken, irregular or oval with ashy centres, rarely > 5 mm long and sometimes with a purplish surround. Infection may penetrate the berry thus causing the pulp to stick to the bean during fermentation. GEOGRAPHICAL DISTRIBUTION: Throughout the tropics (CMI Map 59, ed. 4, 1973). TRANSMISSION: Conidia probably windborne mostly during the day. The possible role of any other hosts seems unimportant.

scholarly journals PENGAMATAN BEBERAPA PENYAKIT yang MENYERANG TANAMAN KOPI (Coffea sp) di DESA MEKAR JAYA KECAMATAN BETARA KABUPATEN TANJUNG JABUNG BARAT

2016 ◽  
Vol 1 (2) ◽  
pp. 78 ◽  
Author(s):  
Yuza Defitri
Keyword(s):  
Pathogenic Fungi ◽  
Rust Disease ◽  
Moist Chamber ◽  
Chamber Method ◽  
Spot Disease ◽  
Cercospora Coffeicola ◽  
Coffee Plants ◽  
Brown Eye Spot

AbstractThe research about the observation of diseases that attack Coffee plants (Coffea sp.) in Mekar Jaya village Betara subdistrict Tanjung Jabung Barat Regency,  and Agriculture Quarantine Laboratory Jambi had been done for six months. The aim of this research is to identification the disease that attack coffee plants. The research was conducted by observing the disease which in coffea plants area, and  identificaton pathogenic fungi in laboratory by moist chamber method using microscop and also fungi identifications book. The result of this research showed that there were three pathogenic fungies which attack Coffee plants namely: 1) Hemileia sp wich caused coffee leaft rust disease, 2) Cercospora coffeicola wich caused Brown eye-spot disease, and 3) Upasia salmanicolor wich caused  Upas fungi disease.  Keywords : Pathogenic fungi, Cooffee Plants Disease, Coffee Plants. AbstrakPenelitian tentang pengamatan beberapa penyakit yang menyerang tanaman Kopi (Coffea sp) di desa Mekar Jaya kecamatan Betara kabupaten Tanjung Jabung Barat dan di Laboratorium Karantina Pertanian Jambi telah dilakukan selama 6 bulan.  Tujuan penelitian adalah untuk mengetahui penyakit yang menyerang tanaman kopi.  Penelitian dilakukan dengan mengamati gejala penyakit di lapangan dan mengidentifikasi jamur patogen di laboratorium secara moist chamber dengan menggunakan mikroskop dan buku identifikasi jamur. Hasil penelitian menunjukkan bahwa ditemukan tiga jamur patogen yang menyerang tanaman kopi yaitu: 1) . Hemileia sp penyebab penyakit Karat Daun 2) Cercospora coffeicola penyebab penyakit Bercak Daun, 3) Upasia salmanicolor penyebab penyakit Jamur upas. Kata Kunci : Jamur Patogen, Penyakit tanaman kopi, Tanaman kopi

scholarly journals Genetic Variability of Cercospora coffeicola from Organic and Conventional Coffee Plantings, Characterized by Vegetative Compatibility

2008 ◽  
Vol 98 (11) ◽  
pp. 1205-1211 ◽  
Author(s):  
R. B. Martins ◽  
L. A. Maffia ◽  
E. S. G. Mizubuti
Keyword(s):  
Genetic Variability ◽  
Production Systems ◽  
Diversity Index ◽  
Vegetative Compatibility ◽  
Cercospora Leaf Spot ◽  
Vegetative Compatibility Groups ◽  
Nit Mutants ◽  
Geographical Regions ◽  
Minas Gerais State ◽  
Cercospora Coffeicola

Cercospora leaf spot is a destructive fungal disease that has become a threat to the coffee industry in Brazil. Nevertheless, little is known about populations of its causal agent, Cercospora coffeicola. We evaluated the potential of using nitrogen-nonutilizing (nit) mutants and vegetative compatibility groups (VCGs) to characterize the genetic variability of the C. coffeicola population associated with coffee plantings in Minas Gerais state (MG), Brazil. A total of 90 monosporic isolates were obtained from samples collected according to a hierarchical sampling scheme: (i) state geographical regions (Sul, Mata, and Triângulo), and (ii) production systems (conventional and organic). Nit mutants were obtained and 28 VCGs were identified. The 10 largest VCGs included 72.31% of all isolates, whereas each of the remaining 18 VCGs included 1.54% of the isolates. Isolates of the largest VCGs were found in the three regions sampled. Based on the frequencies of VCGs at each sampled level, we estimated the Shannon diversity index, as well as its richness and evenness components. Genetic variability was high at all hierarchical levels, and a high number of VCGs was found in populations of C. coffeicola associated with both conventional and organic coffee plantings.

scholarly journals Citronella essential oil in the control and activation of coffee plants defense response against rust and brown eye spot

2012 ◽  
Vol 36 (4) ◽  
pp. 383-390 ◽  
Author(s):  
Ricardo Borges Pereira ◽  
Gilvaine Ciavareli Lucas ◽  
Fabiano José Perina ◽  
Pedro Martins Ribeiro Júnior ◽  
Eduardo Alves
Keyword(s):  
Essential Oil ◽  
Induced Defense ◽  
Defense Responses ◽  
Plant Diseases ◽  
Negative Effects ◽  
Significant Control ◽  
Citronella Oil ◽  
Coffee Plants ◽  
Induced Defense Responses ◽  
Brown Eye Spot

The rust and brown eye spot are the main coffee diseases. The losses are due to intense defoliation of plants, which has reduced its production and longevity. The brown eye spot also occurs in fruits, with negative effects on the beverage quality. Some essential oils have presented promising results in the control of plant diseases, as an alternative to the use of fungicides. The objective of this study was to evaluate citronella essential oil in the control of rust and brown eye spot and in the activation of coffee plants defense responses. Twelve-month-old plants were sprayed with citronella oil 1000 µL L-1, acibenzolar-S-methyl 200 mg L-1 and tebuconazole fungicide 200 mg L-1. Plants were inoculated with Hemileia vastatrix and Cercospora coffeicola seven days later. The application was repeated after 30 days. Plants with five months were sprayed with the same treatments to assess the induced defense responses. Citronella oil controlled rust and brown eye spot with efficiencies of 47.2% and 29.7%, respectively, while tebuconazole presented control of 96.5% and 90.5%, respectively. Acibenzolar-S-methyl reduced brown eye spot by 55.9% and showed no significant control of rust. Citronella oil increased peroxidase and chitinase activities in five months coffee plants 336, and 24 and 336 hours after spraying, respectively. Acibenzolar-S-methyl increased peroxidase, chitinase and ββ-1,3-glucanase activities 192, 288 and 336; 24 and; 240 hours after spraying, respectively. The treatments did not increase accumulation of phenols, but a significant increase in lignin was observed in plants sprayed with citronella oil.

scholarly journals Potential of essential oils for the control of brown eye spot in coffee plants

2011 ◽  
Vol 35 (1) ◽  
pp. 115-123 ◽  
Author(s):  
Ricardo Borges Pereira ◽  
Gilvaine Ciavareli Lucas ◽  
Fabiano José Perina ◽  
Mário Lúcio Vilela de Resende ◽  
Eduardo Alves
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Essential Oils ◽  
Mycelial Growth ◽  
Conidia Germination ◽  
Lemon Grass ◽  
Vitro Effect ◽  
Brown Eye Spot ◽  
Scanning Electron

The objectives of this work were to assess the in vitro effect of essential oils extracted from cinnamon, citronella, lemon grass, India clove, tea tree, thyme, neem and eucalyptus on the conidia germination and on mycelial growth of Cercospora coffeicola, and their efficacy to control the brown eye spot in coffee seedlings (cultivars Catucaí 2SL, Catuaí IAC 62 and Mundo Novo 379/19) in a greenhouse, as well as their effects on the initial germination and infection events by scanning electron microscopy. All essential oils promoted the inhibition of conidia germination with increasing concentrations. India clove, cinnamon, neem, thyme and lemon grass oils inhibited the mycelial growth of C. coffeicola. The cinnamon and citronella oils were the most promising for brown eye spot control in all cultivars. In scanning electron microscopy, the cinnamon and citronella oils reduced germination and mycelial development of C. coffeicola in vivo, eight and 16 hours after inoculation, promoting, in some cases, the leakage of the cellular content. Essential oils of cinnamon and citronella reduced the incidence and severity of brown eye spot, in addition to presenting direct toxicity to the pathogen.

scholarly journals Silicato de potássio na proteção do cafeeiro contra Cercospora coffeicola

2008 ◽  
Vol 33 (6) ◽  
Author(s):  
Daniel R. Amaral ◽  
Mário Lúcio V. Resende ◽  
Pedro M. Ribeiro Júnior ◽  
Jerônimo C. Borel ◽  
Rodrigo E.O. Mac Leod ◽  
...  
Keyword(s):  
Cercospora Coffeicola
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