scholarly journals The Potential of Fungi as Bio-Control Agents in Managing Colletotrichum Kahawae In Kenya

2021 ◽  
Vol 9 (3) ◽  
pp. 171-178
Author(s):  
Happiness Nyambuge Msenya ◽  
Steven Runo ◽  
Douglas Watuku Miano ◽  
Mary Wanjiku Gikungu ◽  
Elijah Kathurima Gichuru ◽  
...  
Keyword(s):  
Potato Dextrose Agar ◽  
Coffee Berry ◽  
Coffee Production ◽  
Coffee Berry Disease ◽  
Colletotrichum Kahawae ◽  
Environment And Health ◽  
Inhibition Of Growth ◽  
Resistant Varieties ◽  
Antagonistic Potential

Colletotrichum kahawae is a causative fungal agent of Coffee Berry Disease (CBD) that negatively affects coffee production. Its control relies on use of resistant varieties and chemical control. Fungicides used in control of CBD are costly and pose a risk to environment and health. The study was aimed at assessing the possible antagonistic potential of fungal isolates against Colletotrichum kahawae in in vitro conditions. Five isolates were used; one isolate was collected from berries while the rest were collected from soil. Testing for antagonism against Colletorichum kahawae was done by co-culturing the isolates on Potato Dextrose Agar. The degree of antagonism was determined by measuring and comparing the radial growth of pathogen with the bio-agent against the control. Out of the five isolates tested against C. kahawae, three isolates Fusarium proliferetum, Penicillium and Fusarium ceraneasum significantly inhibited test pathogen growth at 60%, 55% and 45.45%, respectively. The other isolates, Fumigatus aspergillus and Chaetomium perithecia showed inhibition of growth at 40% and 18.18% respectively. It was concluded that there is potential of using fungi as bio control of the coffee berry disease.

In vitro screening of coffee genotypes for resistance to coffee berry disease (Colletotrichum kahawae)

1995 ◽  
Vol 127 (2) ◽  
pp. 251-261 ◽  
Author(s):  
N. E. NYANGE ◽  
B. WILLIAMSON ◽  
R. J. McNICOL ◽  
CHRISTINE A. HACKER
Keyword(s):  
In Vitro Screening ◽  
Coffee Berry ◽  
Coffee Berry Disease ◽  
Colletotrichum Kahawae

scholarly journals Efficacy of Two New Fungicides Against Colletotrichum Kahawae Infecting Coffee in Kenya

2021 ◽  
Vol 9 (2) ◽  
pp. 83-90
Author(s):  
Samuel Musime Malaka ◽  
Getrude Okutoyi Alwora ◽  
Shem Nchore Bonuke
Keyword(s):  
Negative Control ◽  
Potato Dextrose Agar ◽  
Control Treatment ◽  
Coffee Berry ◽  
Control Data ◽  
Colony Diameter ◽  
Colletotrichum Kahawae ◽  
Poisoned Food Technique ◽  
Positive Controls

Coffee Berry Disease(CBD) caused by Colletotrichum kahawae is a destructive fungal disease of coffee in Kenya, leading to a loss of about 75%. This study aimed to assess the In Vitro efficacy of two fungicides:- CRI 1 (Pyraclostrobin 150 g/L + Fluxapyroxad 75 g/L) and CRI 2 (Pyraclostrobin 128 g/Kg + Boscalid 252 g/Kg) against C. kahawae using poisoned food technique on Potato Dextrose Agar. A total of 170 coffee berries with C. kahawae symptoms were purposively collected from both sprayed and unsprayed plots. Ten rates of each of the two fungicides were assessed ranging from 0.01% to 0.1% at an interval of 0.01%. Two commercial standard fungicides Pyraclostrobin 250 g/L at 0.04% and Tebuconazole 200 g/L + Trifloxystrobin 100 g/L at 0.1% were used as positive controls. Fungal inoculum in PDA media devoid of the fungicide acted as the negative control. Data on colony diameter was collected after every 24 hours for 13 days. Analysis of Variance (ANOVA) of the data on colony diameter was done using CoStat software version 6.400. The results revealed that all the rates of CRI 1 and CRI 2 fungicides controlled the colony diameter of C. kahawae compared to the control treatment. CRI 1 fungicide suppressed the growth of C. kahawae even at the lowest concentration of 0.01% with a percentage control of 64.74 %. The highest concentration of 0.1% had a percentage control of 66.15% . CRI 1 is more effective in controlling C. kahawae since it controls the fungus at a rate even lower than Pyraclostrobin 250 g/L which had a percentage control of 66.10 at a recommended rate of 0.04% and Tebuconazole 200 g/L + Trifloxystrobin 100 g/L fungicides which had a percentage control of 65.76 at a recommended rate of 0.1%. CRI 1 also hade a better percentage control as compared to CRI 2. CRI 2 had a percentage control of 54.63% at the highest rate of 0.1% and a percentage control of 35.60% at the lowest rate of 0.01% . Further studies on CRI 1 and CRI 2 fungicides should be carried out for yield assessment in the field.

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

Effect of cultural practices on the development of arabica coffee berry disease, caused by Colletotrichum kahawae

2007 ◽  
Vol 119 (4) ◽  
pp. 391-400 ◽  
Author(s):  
Joseph Aubert Mouen Bedimo ◽  
Daniel Bieysse ◽  
Ibrahim Njiayouom ◽  
Jean Pierre Deumeni ◽  
Christian Cilas ◽  
...  
Keyword(s):  
Cultural Practices ◽  
Coffee Berry ◽  
Arabica Coffee ◽  
Coffee Berry Disease ◽  
Colletotrichum Kahawae

Arabica Coffee Production in Kenya: An Overview

1986 ◽  
Vol 15 (2) ◽  
pp. 88-92 ◽  
Author(s):  
D. M. Masaba ◽  
J. B. O. Owuor ◽  
M. P. H. Gathaara
Keyword(s):  
Foreign Exchange ◽  
Breeding Programme ◽  
Coffee Berry ◽  
Coffee Production ◽  
Arabica Coffee ◽  
Coffee Berry Disease ◽  
Disease Resistant ◽  
The 1960S ◽  
Intensive Breeding

Coffee is of basic importance to the Kenyan economy, producing about 30 per cent of the total foreign exchange earnings. In the 1960s severe losses from coffee berry disease led to the launching of an intensive breeding programme that has resulted in a new cultivar which is disease resistant, high yielding, and compact in growth and produces good quality arabica coffee.

scholarly journals Effect of Shade on Arabica Coffee Berry Disease Development: Toward an Agroforestry System to Reduce Disease Impact

2008 ◽  
Vol 98 (12) ◽  
pp. 1320-1325 ◽  
Author(s):  
J. A. Mouen Bedimo ◽  
I. Njiayouom ◽  
D. Bieysse ◽  
M. Ndoumbè Nkeng ◽  
C. Cilas ◽  
...  
Keyword(s):  
Disease Incidence ◽  
Specific Effect ◽  
Fruit Trees ◽  
Agroforestry System ◽  
Disease Development ◽  
Coffee Berry ◽  
Arabica Coffee ◽  
Full Sunlight ◽  
Coffee Berry Disease

Coffee berry disease (CBD), caused by Colletotrichum kahawae, is a major constraint for Arabica coffee cultivation in Africa. The disease is specific to green berries and can lead to 60% harvest losses. In Cameroon, mixed cropping systems of coffee with other crops, such as fruit trees, are very widespread agricultural practices. Fruit trees are commonly planted at random on coffee farms, providing a heterogeneous shading pattern for coffee trees growing underneath. Based on a recent study of CBD, it is known that those plants can reduce disease incidence. To assess the specific effect of shade, in situ and in vitro disease development was compared between coffee trees shaded artificially by a net and trees located in full sunlight. In the field, assessments confirmed a reduction in CBD on trees grown under shade compared with those grown in full sunlight. Artificial inoculations in the laboratory showed that shade did not have any effect on the intrinsic susceptibility of coffee berries to CBD. Coffee shading mainly acts on environmental parameters in limiting disease incidence. In addition to reducing yield losses, agroforestry system may also be helpful in reducing chemical control of the disease and in diversifying coffee growers' incomes.

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