This disease, also called Iron Spot, is caused by the fungal pathogen, Cercospora coffeicola and tends to present itself on coffee plants grown in areas of higher. General information. Cercospora leaf spot is a common disease in beetroot and silver beet but is usually unimportant in well-managed crops. It may be a. Abstract. Brown eye spot, caused by Cercospora coffeicola, is an important disease of coffee. Both adaxial and abaxial leaf surfaces were inoculated with a.
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These differing symptoms help explain the various common names for the disease: The fungus is not known to infect fruit. Lesions on infected berries produce conidia 17 days after inoculation. Thorough coverage of the plant canopy is very important.
Fact sheet – Coffee brown-eye spot ()
Compendium of Coffee Disease and Pests. Conidial morphology varies greatly with environmental conditions. Soilborne pathogens, biological control, sustainable production.
Disease is often affected by the environment and the changing conditions. A diagnostic feature is the presence of tiny black dots pseudostromata that form in leaf substomatal cavities within the xoffeicola lesions.
Cercospora Leaf Spot
In general, lesions of this species are able to fuse, and can form large irregular areas of necrotic tissue. Circular brown spots, mostly mm, with bright grey centres and yellow haloes, typical of coffeiccola leaf spot, Cercospora coffeicola.
Mycosphaerella coffeicola is the name of the sexual form of the fungus; the disease is also known by the asexual form, Cercospora coffeicola.
Small brown spots occur on the leaves, more obvious on the upper surface Photo 1. Infection and lesion formation initially occur coffsicola older leaves before progressing to newer ones.
This halo is caused by the toxin cercosporinproduced by Cercospora species.
Pathogen survives mainly in plant debris as desiccation-resistant pseudostromata, but can also survive as conidia in debris or seeds. Soilborne pathogens, biological control, sustainable production Loren Giesler Phone: Transactions of the British Mycological Society.
Mycosphaerella coffeicola – Wikipedia
Back to Main Menu. Larger leaf spots which are circular to irregularly circular develop on other cucurbits.
The spots on the coffelcola may begin when they are still green. However, fungicide resistance management must also be considered and monitored carefully, since C. Conidia of Mycosphaerella coffeicola are produced year-round and enter the coffee plant through stomata on the underside of a leaf, or through the epidermal cuticle on the upper leaf surface.
If on the leaves, conidia are produced 38 days after inoculation. In nurseries, it can cause leaf fall of seedlings and, in severe cases, stem dieback. Views Read Edit View history. Menu Share This Page. Risk factors for this pathogen include: Three spays of copper usually applied monthly beginning at flowering are usually enough to provide control of this fungus.
Note, that copper fungicides may kill the insects that give biological control of the green scale insect, Coccus viridis. Resistant varieties of sugar beet. Louis, Missouri Phone: Black Root of Cucurbits.
Diseases caused by Cercospora” PDF. Rivista di Patologia Vegetale. The fungus, Colletotrichum gloeosporiodes is commonly present.
There are 40 species in the genus Coffea family Rubiaceae that are susceptible to the disease caused by M. Cercospora leaf spot occurs on all cucurbits but is most common on watermelon, cantaloupe, and cucumber. Spore masses of the fungus can be seen in the grey centres of the leaf spots and on blackened ripe berries.
Mycosphaerella coffeicola Cooke J.