Incidence and severity of coffee leaf rust and other coffee pests and diseases in Rwanda

2012 ◽  
Vol 7 (26) ◽  
Author(s):  
Joseph Bigirimana
Keyword(s):  
Leaf Rust ◽  
Pests And Diseases ◽  
Coffee Leaf Rust

scholarly journals Coffee Leaf Rust (Hemileia vastatrix) in Kenya—A Review

Agronomy ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2590
Author(s):  
Elijah Gichuru ◽  
Getrude Alwora ◽  
James Gimase ◽  
Cecilia Kathurima
Keyword(s):  
Leaf Rust ◽  
Insect Pests ◽  
Management Strategies ◽  
Cultural Control ◽  
Management Options ◽  
Hemileia Vastatrix ◽  
Pests And Diseases ◽  
Cash Crops ◽  
Coffee Leaf Rust ◽  
The Status

Coffee is one of the most important cash crops and beverages in the world. Production of coffee is limited by many factors, which include insect pests and diseases, among others. One of the most devastating coffee diseases in many coffee-producing countries is Coffee Leaf Rust caused by the fungus Hemileia vastatrix. Kenya is a coffee-producing country and has conducted studies to understand and manage the disease. Management strategies for the disease include the development and use of fungicide spray programs, cultural control practices, breeding resistant coffee varieties, and biological control agents. This paper reviews the status of the disease and management options applied in Kenya.

scholarly journals The concentration of polyphenolic compounds and trace elements in the Coffea arabica leaves: Potential chemometric pattern recognition of coffee leaf rust resistance

2020 ◽  
Vol 134 ◽  
pp. 109221
Author(s):  
Francisco L.F. Silva ◽  
Gerlan O. Nascimento ◽  
Gisele S. Lopes ◽  
Wladiana O. Matos ◽  
Rodrigo L. Cunha ◽  
...  
Keyword(s):  
Pattern Recognition ◽  
Trace Elements ◽  
Leaf Rust ◽  
Coffea Arabica ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Polyphenolic Compounds ◽  
Coffee Leaf Rust

scholarly journals A fungus-eat-fungus world: Digitopodium, with particular reference to mycoparasites of the coffee leaf rust, Hemileia vastatrix

IMA Fungus ◽  
2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Adans A. Colmán ◽  
Harry C. Evans ◽  
Sara S. Salcedo-Sarmiento ◽  
Uwe Braun ◽  
Kifle Belachew-Bekele ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Democratic Republic Of Congo ◽  
Sequence Data ◽  
Molecular Study ◽  
Classical Biological Control ◽  
Coffea Canephora ◽  
Molecular Data ◽  
Phylogenetic Position ◽  
Hemileia Vastatrix ◽  
Coffee Leaf Rust

AbstractDigitopodium hemileiae was described originally in 1930 as Cladosporium hemileiae; growing as a mycoparasite of the coffee leaf rust (CLR), Hemileia vastatrix, in a sample of diseased leaves of Coffea canephora collected in the Democratic Republic of Congo. No cultures from this material exist. More recently, the type material was re-examined and, based on morphological features, considered to be incorrectly placed in Cladosporium. The new genus Digitopodium was erected to accommodate this species. Interest in fungal antagonists of H. vastarix, as potential biocontrol agents of CLR, led to comprehensive surveys for mycoparasites, both in the African centre of origin of the rust, as well as in its South American exotic range. Among the rust specimens from Ethiopia, one was found to be colonized by a fungus congeneric with, and similar to, D. hemileiae. Pure cultures obtained from the Ethiopian material enabled a molecular study and for its phylogenetic position to be elucidated, based on DNA sequence data from the ITS and LSU regions. Molecular data showed that two members of the recently erected genus Hyalocladosporiella (Herpotrichiellaceae: Chaetothyriales) are congeneric with Digitopodium from Ethiopia and morphologically similar to both D. hemileiae and the two Ethiopian isolates. These isolates were found to be morphologically and genetically identical to H. tectonae, described previously from Brazil. Thus, species of Hyalocladosporiella are re-allocated to Digitopodium here; including D. tectonae, and a novel species, D. canescens, recently found in Brazil growing as a mycoparasite of Puccinia thaliae. The potential use of D. hemileiae and D. tectonae for classical biological control of CLR is discussed.

scholarly journals Effect of foliar application of potassium silicate on the progress of coffee leaf rust

2013 ◽  
Vol 38 (6) ◽  
pp. 547-551 ◽  
Author(s):  
Ueder Pedro Lopes ◽  
Laércio Zambolim ◽  
Pedro Nery Souza Neto ◽  
Antônio Fernando Souza ◽  
Alexandre Sandri Capucho ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Foliar Application ◽  
Potassium Silicate ◽  
Coffee Leaf Rust

scholarly journals Structural and functional analysis of genes with potential involvement in resistance to coffee leaf rust: a functional marker based approach

2019 ◽  
Author(s):  
Geleta Dugassa Barka ◽  
Eveline Teixeira Caixeta ◽  
Sávio Siqueira Ferreira ◽  
Laércio Zambolim
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Rust Resistance ◽  
Function Analysis ◽  
Bac Library ◽  
Leaf Rust Resistance ◽  
Molecular Data ◽  
Coffee Leaf Rust ◽  
Rust Resistance Genes

AbstractPhysiology-based differentiation of SH genes and Hemileia vastatrix races is the principal method employed for the characterization of coffee leaf rust resistance. Based on the gene-for-gene theory, nine major rust resistance genes (SH1-9) have been proposed. However, these genes have not been characterized at the molecular level. Consequently, the lack of molecular data regarding rust resistance genes or candidates is a major bottleneck in coffee breeding. To address this issue, we screened a BAC library with resistance gene analogs (RGAs), identified RGAs, characterized and explored for any SH related candidate genes. Herein, we report the identification and characterization of a gene (gene 11), which shares conserved sequences with other SH genes and displays a characteristic polymorphic allele conferring different resistance phenotypes. Furthermore, comparative analysis of the two RGAs belonging to CC-NBS-LRR revealed more intense diversifying selection in tomato and grape genomes than in coffee. For the first time, the present study has unveiled novel insights into the molecular nature of the SH genes, thereby opening new avenues for coffee rust resistance molecular breeding. The characterized candidate RGA is of particular importance for further biological function analysis in coffee.

scholarly journals Stability of Arabica coffee genotype (Coffea arabica L.) against leaf rust (Hemileia vastatrix)

2021 ◽  
Vol 748 (1) ◽  
pp. 012002
Author(s):  
Sabam Malau ◽  
Albiner Siagian ◽  
Maria Rumondang Sihotang
Keyword(s):  
Leaf Rust ◽  
Block Design ◽  
Research Result ◽  
Dry Season ◽  
Environment Interaction ◽  
Rust Disease ◽  
Hemileia Vastatrix ◽  
Arabica Coffee ◽  
Coffee Leaf Rust ◽  
Rust Severity

Abstract Coffee is now experiencing a serious threat from fungus Hemileia vastatrix which caused epidemic of rust disease in America, Africa, and Asia. As solution, the use of resistant cultivars is the best way. However, interaction between genotype and environment can change the rank of genotypes that shows instability of these genotypes against leaf rust. Purpose of this research was to study stability of genotypes of Arabica coffee against coffee leaf rust. A field experiment was arranged as factorial randomized complete block design with 2 factors (genotypes and climate zones) with three replication. The observed parameters were branch rust incidence, leaf rust incidence, and leaf rust severity. This research result showed significant genotype x environment interaction in all variables. Length of dry season is the most important factor affecting coffee leaf rust because it had the highest correlation coefficient with leaf rust severity (r = 0.662**). Less length of dry season should be the first criteria for selection of coffee farms. The most desired genotype was G7 which performed low leaf rust severity (7.71%) and had a stable resistance indicated by the same leaf rust severity in all environments and 6 SMg. Due to the significant interaction between genotypes and the environment, the genotype to be planted in a region must be tested in that region first.

scholarly journals Seasonal and altitudinal differences in coffee leaf rust epidemics on coffee berry disease-resistant varieties in Southwest Ethiopia

2019 ◽  
Vol 44 (3) ◽  
pp. 244-250 ◽  
Author(s):  
Gerba Daba ◽  
Kenny Helsen ◽  
Gezahegn Berecha ◽  
Bart Lievens ◽  
Adugna Debela ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Coffee Berry ◽  
Southwest Ethiopia ◽  
Coffee Berry Disease ◽  
Disease Resistant ◽  
Resistant Varieties ◽  
Coffee Leaf Rust
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