Abstract
In 1979 and 1980 field tests were made at Fredericton, New Brunswick to evaluate the effect of various oil application methods on the spread of potato virus Y (PVY) and the phytotoxicity they might cause. Control of PVY by oil sprays reached 64%. Control of spread depended largely on the concentration of the oil, and to a lesser extent, on its delivery rate. Tests did not show any significant effect of the spray pressure. There was no significant difference between eight commercial oil formulations.
No significant foliar phytotoxicity or yield reduction resulted from applications of oil, except when a combination of high oil concentration (3% water emulsion) and high rate of application (2240 L/ha) was used. Fungicides mixed with oil or applied immediately after oil produced foliar phytotoxicity. Less phytotoxicity occurred when they were applied 24 h later than oil.
Resumen
Durante 1979 y 1980 se efectuó ensayos de campo en Fredericton, New Brunswick con el objeto de evaluar el efecto de varios métodos de aplicación de aceite, sobre la propagación del virus Y (PVY) de la papa y la fitotoxicidad que pudieran causar. Se controló al PVY hasta un 64% con la aplicación de aceites asperjados. El control de la propagación dependió mayormente, de la concentración del aceite y en menor grado, del volúmen aplicado. Las pruebas no indicaron un efecto significativo en relación con la presión de la aspersión. Ocho diferentes formulaciones comerciales de aceite no demostraron diferencias significativos entre sí.
No se presentó fitotoxicidad significativa ni reducción de rendimientos como consecuencia de las aplicaciones de aceite, excepto cuando una alta concentración de aceite (3% emulsión de agua) se combinó con un alto volúmen de asperión (2240 L/ha.) Fungicidas mezclados con aceite o aplicados inmediatamente después del aceite produjeron fitotoxicidad. Se produjo menor fitotoxicidad cuando se aplicó los fungicidas 24 horas después que el aceite.
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Boiteau, G., Singh, R.P. Evaluation of mineral oil sprays for reduction of virus Y spread in potatoes. American Potato Journal 59, 253–262 (1982). https://doi.org/10.1007/BF02856561
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DOI: https://doi.org/10.1007/BF02856561