NDLI: Effects of Soil Water Level, Black Dot (Colletotrichum coccodes) Infested Soil and Nutrient Depletion on Potato in a Controlled Environment

Content Provider	Springer Nature Link
Author	Cummings, Thomas F. Johnson, Dennis A.
Copyright Year	2013
Abstract	The effects of soil water level and soil infested or not infested with Colletotrichum coccodes were quantified and compared on Umatilla Russet potato in repeated greenhouse trials. Nitrogen levels in leaflets and tuber yield differed significantly for effect of water level but there was no effect for soil infestation in both trials. More leaflet N as measured by chlorophyll and less tuber yield occurred in the low than the medium and high soil water treatments. Number of progeny tubers was not affected by C. coccodes but numbers were significantly less for the low water level than the high water level in one trial. Root weight was significantly reduced by C. coccodes in both trials and was significantly less in the high than the low and medium soil water levels in one trial. Incidence of infected progeny tubers was significantly reduced in infested soils for the low soil water compared to the medium or high soil water levels in one trial. The effect of increasing levels of water in infested soils had large and significant increases for percentage of stem area with sclerotia in both trials. Managing soil water by not overwatering in irrigated potato fields in the presence of C. coccodes may reduce black dot severity and quantity of sclerotia that potentially can overwinter and serve as sources of infection for subsequent crops. Analyses demonstrated a potential for significant associations between plant and disease variables not evidence for cause and effect.Se cuantificaron Los efectos del nivel del agua en el suelo y de suelo infestado o no con Colletotrichum coccodes y se compararon en la papa Umatilla Russet en ensayos repetidos en invernadero. Los niveles de nitrógeno en los folíolos y el rendimiento de tubérculo difirieron significativamente por efecto del nivel del agua, pero no hubo efecto por la infestación del suelo en ambos ensayos. Se presentó más nitrógeno en los folíolos medido por clorofila, y menos rendimiento de tubérculo, en los tratamientos de baja agua en el suelo que en los de media y alta. No se afectó el número de tubérculos de progenie por C. coccodes pero los números fueron significativamente menores para el nivel bajo de agua que para los niveles altos en un ensayo. Se redujo significativamente el peso de raíz por C. coccodes en ambos ensayos y fue significativamente menor en los niveles altos de agua que en el bajo y medio en un ensayo. Se redujo significativamente la incidencia de tubérculos de progenie infectados en suelos infestados para el contenido bajo de agua en el suelo comparado con los niveles medio y alto en un ensayo. El efecto de aumentar los niveles de agua en suelos infestados tuvo aumentos grandes y significativos para el porcentaje de área del tallo con esclerocios en ambos ensayos. El manejo del agua en el suelo mediante el no sobrerriego en los campos de papa de riego en la presencia de C. coccodes, pudiera reducir la severidad de la mancha negra y la cantidad de esclerocios que potencialmente puedan invernar y servir como fuentes de infección para cultivos subsecuentes. Los análisis demostraron potencial para asociaciones significativas entre variables de planta y enfermedad sin evidencia para causa y efecto.
Starting Page	327
Ending Page	336
Page Count	10
File Format	PDF
ISSN	1099209X
Journal	American Potato Journal
Volume Number	91
Issue Number	4
e-ISSN	18749380
Language	English
Publisher	Springer US
Publisher Date	2013-11-21
Publisher Institution	Potato Association of America
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Black dot (Colletotrichum coccodes) Irrigation Nutrient depletion Photoperiod Cause and effect Plant Sciences Agriculture Plant Genetics & Genomics Plant Breeding/Biotechnology Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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