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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This page was last edited on 23 Septemberat Stress can further be minimized if post and pre-harvest damage by machinery or laborers is avoided. 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 cercospoora.
It is most commonly referred to as the asexual organism Cercospora coffeicola. These differing symptoms help explain the various common names for the disease: College of Tropical Agriculture and Human Resources. Three spays of copper usually applied monthly beginning at flowering are usually enough to provide control of this fungus. Soybean Robert Harveson Phone: In general, lesions of this species are able to fuse, and can form large irregular areas of necrotic tissue.
Favorable environmental conditions around the equator are warm and humid wet seasons followed by a warm and dry season. Coffee is the 15th most valuable traded commodity in the world . Sometimes, the spots grow into large cercosporra, and a leaf blight occurs. Often, other fungi invade xercospora berries following infections of Coffdicola.
When moisture is sufficient, new conidia are formed and spread via rain-splash or wind to new leaves or plants. Mycosphaerella coffeicola Cooke J.
Cercospora Leaf Spot
Spores of the fungus form in the grey centres. The spots occur within the leaf, mostly between the veins, and also at the margins.
Larger leaf spots which are circular to irregularly circular develop on other cucurbits. Cocfeicola coverage of the plant canopy is very important. Diseases caused by Cercospora” PDF.
If on the leaves, conidia are produced 38 days after inoculation. Check date values in: The fungus, Colletotrichum gloeosporiodes is commonly present. In Samoa, the disease is most severe on the berries. In nurseries, it can cause leaf fall of seedlings and, in severe cases, stem dieback. Black Root of Cucurbits. This halo is caused by the toxin cercosporinproduced by Cercospora species. For example if a plant has leaves bronzed along edges, cupped down-ward; new leaves dead; eventual die back of shoot tips, then it is likely the plant has a calcium deficiency.
Severely affected leaves wither and die from coalescing lesions. Coffee seedlings showing small brown spots of Cercospora coffeicola.
Cercospora Leaf Spot Scroll for More. Generally, they are more irregular in shape than on the leaves, brown, and mainly on the side exposed to the sun. Prevention is the most effective method of managing M.
Ascomycota >> Dothideomycetes >> Dothideomycetes >> Cercospora coffeicola
Plant symptoms such as chlorosis, leaf curling, and bronzing along the edges of leaves can be used to diagnose specific nutrient deficiencies. Views Read Edit View history. Corn and sorghum Stephen N. There are 40 species in the genus Coffea family Rubiaceae that are susceptible to the disease caused by M. Conidia are elongated, multiseptate, and either straight or slightly curved. To avoid wilting stress plants should be properly irrigated.
Retrieved from ” https: Mycosphaerella coffeicola Arabica coffee infected with Cercospora berry blotch Scientific classification Kingdom: Menu Share This Page. Dry bean, sugar beet, and sunflower.
Generally, it is less important on mature plants, although, when conditions favour the disease, epidemics occur on even well-maintained trees.
Curtis Ramularia goeldiana Sacc. As the lesion matures, it becomes deeply coffeiclla with an ashy center and may penetrate down to the coffee bean to affect the bean quality and taste.