This disease is not as much of a problem as many (or most) commercial tomato varieties have resistance to Alternaria stem canker. Symptoms of Alternaria stem canker can appear on the stems, leaves, and fruit of tomato plants. lycopersici and is primarily a problem of coastal-grown tomatoes in California. In contrast, Alternaria stem canker is caused by A. This phase of the disease is referred to as collar rot. However, if stem-infected tomato seedlings are set in the field, stem lesions will enlarge and eventually girdle the plants. Early blight is more commonly seen on field grown tomatoes and occurs on the foliage, stem, and fruit. linariae, that causes early blight of tomato. Collar rot is caused by the same pathogen, A. However, the concentric rings may not always be pronounced with collar rot. Both pathogens can cause large, irregularly shaped stem lesions with pronounced concentric rings. Bajo las condiciones del estudio en comparación con la escala de valores de la resistencia, pertenece a una variedad moderadamente resistente con genes de resistencia horizontal a dicha enfermedad fúngica.General Information Skip to General InformationĬollar rot and Alternaria stem canker of tomato are both caused by fungal pathogens in the genus Alternaria. ![]() La variedad comercial (Santa Cruz Kada Gigante), presentó el porcentaje de infestación promedio (50%) más bajo al ataque del tizón tardío durante la etapa de evaluación desde la inoculación hasta las 120 horas a partir de ahí los foliolos de esta variedad también alcanzó el máximo de infestación. La metodología aplicada fue diseño al azar, seis tratamientos y cinco repeticiones, el experimento consistió en recolectar foliolos sanos de cinco variedades mejoradas y una variedad local de tomate desinfectar e inocular en ambos sitios de la nervadura central de la hoja con Phytophthora infestans con una concentración de conidios 1x10^7/ml en cajas Petri. Para estimar el porcentaje de infestación se registró desde el momento de inoculación hasta la máxima infestación, con una frecuencia de 8 horas hasta la 168 horas. La evaluación se realizó sobre el porcentaje de infestación en foliolos de tomate. Para responder a los bajos rendimientos (económicos y de cosecha) provocados por las enfermedades que atacan al tomate, se considera utilizar variedades de tomates resistentes al tizón tardío (Phytophthora infestans) de tomate (Lycopersicon esculentum Mill) y papa (Solanum tuberosum). A comparison of the study conditions to the scale of resistance values shows it must belong to a moderately resistant variety with horizontal resistance genes to this fungal disease. After 120 hours, the leaflets of this variety also reached maximum infestation. The commercial variety (Santa Cruz Kada Gigante) presented the lowest average infestation rate (50%) during the evaluation stage from time of inoculation up until 120 hours. After collection, the leaflets were disinfected and inoculated in petri dishes on both sites of the midrib with Phytophthora infestans at concentrations of 1 x 107 conidium/mL. The experiment consisted of collecting healthy leaflets from five improved varieties and one local variety of tomato. ![]() The methodology applied was at random and included six treatments and five replications. The percentage of infestation was recorded every eight hours from the time of inoculation until maximum infestation was reached. The evaluation of the percentage of infestation was performed with tomato leaflets over a 168 hour period. In order to respond to the low economic and harvesting yields caused by diseases that attack the tomato, we considered using tomato varieties resistant to late blight (Phytophthora infestans) of tomato (Lycopersicon esculentum) and potato (Solanum tuberosum).
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