| dc.contributor | | en-US |
| dc.creator | Mantecón, Jorge D. | |
| dc.date | 2009-04-01 | |
| dc.date.accessioned | 2020-10-29T14:43:25Z | |
| dc.date.available | 2020-10-29T14:43:25Z | |
| dc.identifier | https://rcia.uc.cl/index.php/ijanr/article/view/232 | |
| dc.identifier.uri | https://revistaschilenas.uchile.cl/handle/2250/156443 | |
| dc.description | During the 2005 and 2006 growing seasons, two field trials were conducted at the INTA Balcarce Experimental Station (Argentina) to study the control of potato early blight (Alternaria solani). Uncut virus-free seed tubers of potato (Solanum tuberosum) cv. Pampeana INTA that were susceptible to early blight and resistant to late blight were machine planted in 0.20-m intervals in rows spaced 0.8 m apart. Each plot consisted of 4 rows that were 5 meters long. Difenoconazole (Bogard 25EC) was sprayed weekly at a rate of 0.25 Lּ ha-1 or bi-weekly at a rate of 0.50 Lּ ha-1 on a preventive program and on a curative program. The same treatments and rates were also applied when the forecast model (Specware 6.02) reached 300 P-Days after emergence, and applications were then repeated thereafter every 7 FAST severity values. Disease severity was rated using the 0-50 rating scale (0 = no infection; 50 = maximum infection). Tubers from the two center rows of each plot were harvested and graded into two categories, either marketable (>60 g) or undersize tubers “seeds” (<60 g), and weighed for total yield. Climatic conditions were very favorable for disease development. In both years, untreated plants showed severe early blight symptoms and reached the maximum disease severity. Preventive fungicide applications at the high dose and applications following the Specware 6.02 disease prediction model showed similar effi cacy. Curative fungicide applications at the lowest dose and applications on the basis of the Specware 6.02 disease prediction model resulted in a poor control of foliar symptoms, and yields were lower than those obtained with a preventive control program. Durante los años 2005 y 2006 se desarrollaron ensayos de control del tizón temprano (Alternaria solani) de la papa (Solanum tuberosum) en la Estación Experimental del INTA en Balcarce, Argentina. Se utilizaron tubérculos “semilla”, cultivar Pampeana INTA, susceptible a tizón temprano y resistente a tizón tardío. Se evaluó el fungicida difenoconazole (Bogard 25EC), triazol, el cual se pulverizó semanalmente en dosis de 0,25 Lּ ha-1 y quincenalmente en dosis de 0,50 Lּ ha-1, siguiendo un programa preventivo. Los mismos tratamientos se aplicaron según un programa curativo y luego de la emergencia del cultivo cuando el sistema predictivo de aparición de la enfermedad alcanzó los 300 P-Days de acuerdo con el modelo de Specware 6.02, repitiendo las pulverizaciones cuando la severidad en el sistema Specware 6.02 alcanzó valores de 7. La severidad de la enfermedad se evaluó en escala 0-50 (0 = sin síntomas; 50 = máxima infección). Se evaluó el rendimiento de tubérculos comerciales, “semilla” y total. Las condiciones climáticas fueron muy favorables para el desarrollo del tizón temprano. En ambas temporadas las plantas testigo presentaron severos niveles de infección y alcanzaron los máximos valores en la escala de evaluación. Difenoconazol aplicado en la mayor dosis según el programa preventivo de control y el sistema predictivo Specware 6.02 mostró similar eficacia de control de los síntomas foliares, obteniéndose similares rendimientos. El programa curativo de control y el sistema predictivo utilizando difenoconazole en la menor dosis fue menos eficaz y se obtuvieron menores rendimientos que en el programa preventivo de control de esta enfermedad. | en-US |
| dc.format | | |
| dc.language | eng | |
| dc.publisher | Pontificia Universidad Católica de Chile | en-US |
| dc.relation | https://rcia.uc.cl/index.php/ijanr/article/view/232/176 | |
| dc.source | International Journal of Agriculture and Natural Resources; Vol 36, No 2 (2009); 291-296 | en-US |
| dc.source | International Journal of Agriculture and Natural Resources; Vol 36, No 2 (2009); 291-296 | es-ES |
| dc.source | 2452-5731 | |
| dc.source | 2452-5731 | |
| dc.subject | | en-US |
| dc.subject | Alternaria solani, Argentina, disease control, early blight, potato, prediction model, Solanum tuberosum, control de enfermedades, modelos de predicción, papa, tizón temprano. | en-US |
| dc.title | Control of potato early blight with triazole fungicide using preventive and curative spraying, or a forecasting system. | en-US |
| dc.type | info:eu-repo/semantics/article | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | | en-US |
| dc.type | | es-ES |
