Diseases of Cassava (<i>Manihot esculenta</i>Crantz)

Lozano, J. C.; Booth, R. H.

doi:10.1080/09670877409412334

Cited by 32 publications

(21 citation statements)

References 23 publications

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“…This was indicated by the distance and size of canker being zero in the third trial. This is in line with the report made by Lozano and Booth (1974) that the geographic distribution of cassava anthracnose depends to some extent on the climatic factors such as rainfall, relative humidity, temperature and wind. Fokunang et al (1999) also reported higher anthracnose incidence and severity in wet season cassava plantings than in the dry season crop in Nigeria, and concluded that the pathogen attacks cassava mostly during prolonged periods of rainfall.…”

Section: Discussionsupporting

confidence: 78%

“…These cankers may serve as entry-points for other pathogens. Lozano and Booth (1974) and Akinyele and Ikotun (1989) reported that cankers serve as entry-points for such pathogens as Agrobacterium manihoti that cause crown gall disease in South America, as well as stem, root and tuber-rotting organisms such as Sphaerostible repens and Armillaria mellea. The presence of these pathogens leads to secondary infections, which lead to total loss of both yield and planting materials.…”

Section: Discussionmentioning

confidence: 99%

“…The deeper cankers affect plant-conducting tissues, leading to poor plant vigour, severe wilting, and defoliation ( Van der Bruggen and Maraite, 1987;Fokunang, et al, 1999a). Lozano and Booth (1974) and Akinyele and Ikotun (1989) stated that these cankers serve as entry points for other pathogens such as Agrobacterium manihotis, which causes crown gall disease of south America as well as stem, root and tuber-rotting organisms such as Sphaerostilbe repens, Armillaria mellea. Anthracnoses are epidemic diseases characterised by a particular aspect of symptoms (cankers on stems, twigs and fruit, leaf spots and tip dieback) on aerial parts of diseased plants (Massenot and Raynal, 1973).…”

Section: Introductionmentioning

confidence: 99%

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Effect of canker size on availability of cassava planting materials in Nigeria

Obilo¹,

Ikotun²

2010

African Crop Science Journal

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Cassava (Manihot esculenta L.) production is highly limited by cassava anthracnose disease (CAD) which causes significant losses in planting materials. An experiment was laid out at Ihiagwa, Owern in Nigeria with eighteen treatments replicated three times. Disease severity was scored on a scale of 1-5, and disease incidence was recorded as the percentage of infected plants in each host plant line. In all the three trials, TMS 30211 (425 mm) had cankers high up on the stem, showing that they were infected later in life. This will lead to more disease -free stems. Cultivars Akwakwuru (39.6 mm 2 ), TMS 30555 (31.6 mm 2 ), and Nwaocha (43.7 mm 2 ), had the large canker size on whole plant, young stem, shoot and maturing stem. These cultivars had low resistance to anthracnose. In all the trials, TMS 4(2)1425, and TMS 30211, had the smallest canker size (1.80 and 6.3 mm 2 , respectively) on whole plant, young stems, shoots and maturing stems. TMS 4(2)1425 and TMS 30211 had higher resistance to anthracnose and can be recommended for further improvement through breeding, because plants producing smaller -size lesions survive much longer and would also mature and produce flowers needed for breeding for improving resistance to CAD and other diseases.Key Words: Cassava anthracnose disease, Manihot esculenta, resistance RÉSUMÉ La production de manioc (Manihot esculenta L.) est fortement limitée par la maladie d'anthracnose de manioc (DAO) qui cause des pertes significatives en matières végétales. Une expérience a été présentée avec dix-huit traitements repliés trois fois. La sévérité de la maladie a été marquée sur une échelle de 1-5, et l'incidence de la maladie a été enregistrée comme pourcentage des usines infectées dans chaque ligne d'usine de centre serveur. Dans toutes trois épreuves, TMS 30211 (425 millimètres) a eu des cankers haut vers le haut sur la tige, prouvant qu'ils ont été infectés plus tard dans la vie. Ceci mènera à plus de maladie -tiges libres. Cultivars Akwakwuru, (39.6 millimètres 2

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Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of canker size on availability of cassava planting materials in Nigeria

Obilo¹,

Ikotun²

2010

African Crop Science Journal

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“…A doença é encontrada em todas as regiões produtoras de mandioca no mundo (JAMESON, 1970;LOZANO;BOOTH, 1974), causa o amarelecimento foliar e posterior desfolha provocando grandes perdas na produção.…”

Section: Cercospora Henningsiiunclassified

PENETRATION OF FORMS OF GENUS Cercospora

Paula

Pozza

Santos

et al. 2015

Nucleus

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RESUMO:O gênero Cercospora destaca-se por ser o agente etiológico de doenças em importantes culturas acarretando perdas de produção em todo o mundo. Esses patógenos comumente estão associados a sintomas de manchas foliares, mas podem causar lesões em flores, frutos, brácteas, sementes e pedicelos em diversas famílias de plantas. Essa revisão tem como objetivo descrever as diferentes formas de penetração de espécies do gênero Cercospora, agentes etiológicos de doenças em culturas de grande importância comercial, como C. beticola em beterraba, C. heningsii em mandioca, C. coffeicola em cafeeiro, C. sojina em soja, C. zeae-maydis em milho, C. ricinella em mamona e C. kikuchi em soja. A penetração pode ocorrer através dos estômatos das folhas dos hospedeiros, também pode ocorrer através de ferimentos nos tecidos da epiderme e ainda por força física e/ou ação de enzimas diretamente através da epiderme do órgão do hospedeiro. E em relação ao tubo germinativo, as diferentes espécies podem desenvolver um ou mais tubos germinativos. Ou seja, Cercospora spp apresenta diferentes formas de penetração dependendo do hospedeiro.Palavras-chave: Cercosporiose. Doenças. Culturas. SUMMARY:The genus Cercospora has species that cause diseases in important crops causing yield losses worldwide. These pathogens are commonly associated with leaf spot symptoms, but can cause injury of flowers, fruits, bracts, pedicels and seeds in various plant families. This review aims to describe the different forms of penetration of the genus Cercospora, causing diseases in crops of commercial importance, such as C. beticola in sugar beet, cassava in C. heningsii, C. coffeicola in coffee, C. sojina in soybean, C. zeae-maydis in corn, C. ricinella in castor and C. kikuchii in soybean. The penetration may occur through the stomata of the leaf of the host can also occur through the epidermal tissue injury and which occur by physical force and/or the action of enzymes directly through the epidermis of the host body. And for the development of the germ tube, different species may develop one or more germ tubes. Then, Cercospora spp has different ways of penetration depending of your host.Keywords: Brown eye spot. Plants disease. Crops. INTRODUÇÃOO gênero Cercospora é considerado um dos maiores e mais heterogêneos dentro da classe dos fungos Hyphomycetes. Há relatos em todo o mundo da ocorrência de diversas espécies desses fitopatógenos. Essas espécies estão na maioria das vezes associadas a sintomas de manchas foliares, mas também podem causar lesões em flores, frutos, brácteas, sementes e pedicelos, em hospedeiros na maior parte das famílias de plantas, muitas delas de grande interesse agrícola, nas mais variadas condições 1 Universidade Federal de Lavras

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“…A mandioca é uma cultura de elevado interesse econômico mundial, por sua ampla utilização na agropecuária, grande adaptação a condições edafoclimáticas, e pela produção de fécula por unidade de área; além disso, tem um importante papel & Booth, 1974;Daniel & Boher, 1978;Dedal et al, 1980;Elango & Lozano, 1981;Daniel & Boher, 1982;Lozano, 1986).…”

Section: Introductionunclassified

Sobrevivência de Xanthomonas axonopodis pv. manihotis em manipueira sob condições ambientais

Theodoro

Maringoni

2002

Pesq. agropec. bras.

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Termos para indexação: bactéria, incubação, pH, acidez, resíduo. Survival of Xanthomonas axonopodis pv. manihotis in manipueira under environmental conditionsAbstract The objective of this work was to evaluate the survival of a Xanthomonas axonopodis pv. manihotis (Xam) strain, resistant to streptomycin sulfate, in manipueira (cassava residue) incubated under environmental conditions, in three periods of the year (March, July and October 2000). A semi-selective culture medium and the polymerase chain reaction (PCR) or biological amplification (BIO-PCR) methods were used. The pH and the total acidity of the manipueira were determined during the incubation period. The strain survived less than 24 hours in the three periods of the year. The PCR or BIO-PCR method was not effective in monitoring the strain survival in manipueira , as it showed contradictory and unreliable results. An increase in total acidity and a decrease in pH of the manipueira were observed, explaining the survival behavior of Xam strain.

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Diseases of Cassava (Manihot esculentaCrantz)

Cited by 32 publications

References 23 publications

Effect of canker size on availability of cassava planting materials in Nigeria

Effect of canker size on availability of cassava planting materials in Nigeria

PENETRATION OF FORMS OF GENUS Cercospora

Sobrevivência de Xanthomonas axonopodis pv. manihotis em manipueira sob condições ambientais

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