manchado foliar y de frutos 08
TRANSCRIPT
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MANCHADO FOLIAR Y DE FRUTOS
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Pyricularia oryzaeTizón de gramíneas
Teleomorfo: Magnaporthe griseaDistribución: Tabasco, Campeche y Morelos.Condiciones ambientales: septiembre y octubre; T entre 18-31ºC y HR hasta de 95%
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Pyricularia oryzaeen arroz
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CONTROL
• Eliminación de restos vegetales contaminados.
• Cambios de fecha de siembra.
• Fertilización adecuada
• Benlate, brestán; resultados moderadamente satisfactorios
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Alternaria
• A. solani Tizón temprano. Solanáceas (chile, jitomate, papa)
• A. porri Mancha púrpura (ajo, cebolla)• A. longipes Manchado foliar (tabaco)• A. brassicae Manchado foliar (crucíferas)• A. alternata Manchado foliar (rosa)
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Ciclo de vida de Alternaria solani
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Alternaria longipes
Pseudomonas tabaci
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CONTROL
• Semillas sanas
• Semillas tratadas con agua caliente, con arasán
• Aspersiones químicas (Maneb, Zineb, Dyrene) en dosis de 2- 4 Kg/Ha
• Rotación de cultivos
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Cercospora
• Cercospora capsici chile, jitomate
• C. personata Mancha de la hoja (cacahuate)
• C. coffeicola Mancha de hierro (cafeto)
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“Mancha de hierro”
Conidióforos y conidios de Cercospora
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CONTROL
• Semillas libres de la enfermedad
• Rotación de cultivos
• Fungicidas. Dyrene, Caldo QúPara la mancha de hierro: Benlate 50% (0.7g/litro de agua) y maneb (2g/litro de agua)
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Helminthosporium
• H. oryzae Mancha parda (arroz)
• H. maydis Tizón del follaje (maíz)
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Manchado foliar por Helminthosporium
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CONTROL
• Uso de variedades resistentes
• Semillas sanas
• Semillas tratadas
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Septoria y Phoma
• Septoria. Manchas foliares en gramíneas. Remolacha, apio, zanahoria, azalea, clavel y otras.Picnidios como pequeños corpúsculos negros, visibles a simple vista, en el centro de la mancha.
• Phoma costarricensis. Cafeto.“Requemo” o “derrite”
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“derrite” o “requemo” en el cafeto
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En otoño e invierno, con continuas lluvias.Se evita con aspersiones de difolatán3g/litro a intervalos de 28 días.
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ANTRACNOSIS
• ColletotrichumC. gloesporioidesC. lindemuthianumC. capsici
• Pestalotia
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Mancha por rayos solares
Planta defoliada
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acérvuloen
papayo
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Colletotrichum gloeosporioides
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9
acérvulo y conidios de Colletotrichum
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Colletotrichum gloeosporioides
• “Pudrición amarga de la manzana”Teleomorfo: Glomerella cingulata
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Mancha hundida, oscura, brillante
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Pestalotia psidii “clavo”
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5
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mancha de color gris, limitada por un margen oscuro
“SIGATOKA AMARILLA”/“SIGATOKA NEGRA”
o“CHAMUSCO DEL
PLÁTANO”
Mycosphaerella musicola
Cercospora(anamorfo)
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CONTROL
• Recolección y quema de hojas infectadas.
• Variedades resistentes
• Aspersiones de fungicidas (caldo bordelés, trioxil, citrolina, captán o benlate.
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FIN