The fine structure of the coffee leaf rust, Hemileia vastatrix

1974 ◽  
Vol 52 (6) ◽  
pp. 1363-1367 ◽  
Author(s):  
Luisete Rijo ◽  
J. A. Sargent
Keyword(s):  
Fine Structure ◽  
Golgi Apparatus ◽  
Leaf Rust ◽  
Wall Thickness ◽  
Coffea Arabica ◽  
Rust Fungi ◽  
The Body ◽  
Hemileia Vastatrix ◽  
Coffee Leaf Rust

The fine structure of two races of Hemileia vastatrix that cause leaf rust in Coffea arabica is similar in many respects to earlier descriptions of other rust fungi. Certain features, however, are distinctive. Both hyphae and haustoria contain occasional tubular complexes composed of tubules about 300 Å in diameter. These might function as a Golgi apparatus. The haustorium neck ring incorporates the entire wall thickness at its proximal end, but distally only the outer and innermost layers of the wall are involved. The invaginated host plasmalemma, which surrounds the body of the haustorium, has a furrowed surface and in the adjacent haustorial sheath fibrillar elements are prominent. The plasmalemma furrows and the sheath fibrillar elements are discussed in relation to the organization of the structure of the sheath and absorption of materials through it.

Genetic analysis of partial resistance to coffee leaf rust (Hemileia vastatrix Berk & Br.) introgressed into the cultivated Coffea arabica L. from the diploid C. canephora species

Euphytica ◽  
2008 ◽  
Vol 167 (1) ◽  
pp. 57-67 ◽  
Author(s):  
Juan Carlos Herrera P. ◽  
Gabriel Alvarado A. ◽  
Hernando A. Cortina G. ◽  
Marie-Christine Combes ◽  
Gladys Romero G. ◽  
...  
Keyword(s):  
Genetic Analysis ◽  
Leaf Rust ◽  
Partial Resistance ◽  
Coffea Arabica ◽  
Hemileia Vastatrix ◽  
Coffee Leaf Rust ◽  
Coffea Arabica L

Hemileia vastatrix. [Descriptions of Fungi and Bacteria].

1964 ◽  
Author(s):  
G. F. Laundon
Keyword(s):  
Leaf Rust ◽  
Geographical Distribution ◽  
Long Range ◽  
Coffea Arabica ◽  
Lower Surface ◽  
Spore Dispersal ◽  
Hemileia Vastatrix ◽  
Coffee Leaf Rust ◽  
Rain Splash ◽  
Yellowish Orange

Abstract A description is provided for Hemileia vastatrix. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Coffea arabica, C. canephora, C. liberica, and other Coffea spp. DISEASE: Coffee leaf rust. Produces yellowish-orange, powdery, rounded blotches on the lower surface of the leaves, which may coalesce with others to form an irregularly shaped lesion, accompanied by a chlorosis of the upper surface. With age, the centre of the leaf turns dark brown and dies, followed by premature defoliation and die-back of the branches. Has also on rare occasions been recorded on berries and young shoots. GEOGRAPHICAL DISTRIBUTION: Africa, Asia, Australasia, end Oceania (CMI Map 5). TRANSMISSION: Earlier workers [Ward, J. Linn. Soc. (Bot.) 19: 299-335, 1882, Mayne (12: 285)] attributed spore dispersal to wind but more recent investigations have emphasised the role played by rain-splash over short distances (Bock, Trans. Brit. Mycol. Soc. 45: 289-300, 1962). Air currents may be implicated in long-range inter-continental dispersal (Wellman, 1957). Two species of thrips have been found feeding on and aiding the dispersal of urediospores in India (40: 467) and urediospores have also been observed to be mechanically transported on the bodies of two species of hymenopterous parasites of larvae of cecidomyid midges commonly found feeding on urediospores in Kenya (Crowe, Trans. Brit. Mycol. Soc. 46: 24-26, 1963).

Timing and Frequency of Spraying for Control of Coffee Leaf Rust in Southern India

1969 ◽  
Vol 5 (2) ◽  
pp. 117-123 ◽  
Author(s):  
K. C. Ananth
Keyword(s):  
Leaf Rust ◽  
Leaf Spot ◽  
Coffea Arabica ◽  
Hemileia Vastatrix ◽  
Early Season ◽  
Leaf Disease ◽  
Coffee Leaf Rust ◽  
Mysore State ◽  
Hot Weather ◽  
Coorg District

SummaryTo study control of Hemileia vastatrix leaf disease in Coffea arabica L., an experiment was run for a year in Coorg District of Mysore State. Three and four early-season sprays coupled with two mid-season ones gave a reasonable control, as evaluated by leaf spot counts, but a high proportion of rust-affected leaves were retained on the bushes. Infection commenced in the hot weather, immediately after showers, and the number of infected leaves appears to have been more important than the average leaf spot counts. Control of leaf disease up to December, and a late incidence of the rust during January, may not affect crop prospects appreciably. It is suggested that reduced early sprays coupled with pre-monsoon and timely mid-season schedules should reasonably control the incidence of 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 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.

Non-host resistance responses of Arabidopsis thaliana to the coffee leaf rust fungus (Hemileia vastatrix)

Botany ◽  
2010 ◽  
Vol 88 (7) ◽  
pp. 621-629 ◽  
Author(s):  
Helena Gil Azinheira ◽  
Maria do Céu Silva ◽  
Pedro Talhinhas ◽  
Clara Medeira ◽  
Isabel Maia ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Leaf Rust ◽  
Rust Fungus ◽  
Hemileia Vastatrix ◽  
Callose Deposition ◽  
Mesophyll Cells ◽  
Model Plant ◽  
Heterologous System ◽  
Coffee Leaf Rust ◽  
Model Plant Arabidopsis Thaliana

Leaf rust, caused by Hemileia vastatrix Berk & Broome, is the most destructive fungal disease of coffee. In the absence of a suitable gene validation system in coffee, the objective of this study was to investigate whether the model plant Arabidopsis thaliana (L.) Heynh. may be used as a heterologous system for the molecular dissection of coffee responses to leaf rust. Histological examination of A. thaliana (Col-0) leaves inoculated with H. vastatrix (race II) showed that by 24 h after inoculation (hai), H. vastatrix uredospores differentiated appressoria and penetrated the stomata, but failed to form haustoria. Arabidopsis thaliana cellular resistance responses included hypersensitive-like response (HR) of stomata guard cells together with accumulation of phenolic compounds and callose deposition in walls of epidermal and mesophyll cells. Results indicate that H. vastatrix infection triggered the induction of a set of defence-related genes peaking at 18 and 42 hai. The non-host HR triggered by H. vastatrix in the model plant A. thaliana makes it usable to infer the function of coffee genes involved in pre-haustorial rust resistance.

Evaluation of Different Botanicals for the Control of Coffee Leaf Rust (Hemileia vastatrix Berkeley and Broome)

2017 ◽  
Vol 14 (6) ◽  
pp. 1-8
Author(s):  
R Mudyiwa ◽  
N Mwatsiya ◽  
B Manenji ◽  
P Chidoko ◽  
C Mahoya
Keyword(s):  
Leaf Rust ◽  
Hemileia Vastatrix ◽  
Coffee Leaf Rust
Sign in / Sign up

Export Citation Format

Share Document