Abstract
The disease inducing potential of tuberborne inoculum ofRhizoctonia solani AG-3 on potato was evaluated. Four cultivars of potato, with or without visible evidence of tuberborne inoculum and with or without formaldehyde treatment, were planted in the field. Total and US #1 yields were reduced by an average of 19.2% and 35.1% respectively on those plots from seed tubers with tuberborne inoculum and plots from seed tubers that received no formaldehyde treatment. Tuberborne inoculum delayed emergence by 23.9%, and large girdling lesions appeared on the subterranean stems of more than 90% of the plants produced from contaminated seed. A high incidence of aerial stem lesions and hymenial development also was associated with tuberborne inoculum. However, the number of stems per plant did not differ significantly among treatments. A two min dip in 1.85% aqueous solution of formaldehyde killed most if not all of the seedborne inoculum.
Compendio
Se evaluó el potencial del inóculo deRhizoctonia solani AG-3 presente en los tubérculos-semillas para inducir la rhizoctoniasis. Se sembraron en el campo cuatro variedades de papa, con o sin evidencia visible de inóculo presente en los tubérculos-semillas y con o sin tratamiento de formaldehido. Los rendimientos total y de US #1 se redujeron en promedio 19,2% y 35,1%, respectivamente, en los tratamientos con inóculo presente y sin tratamiento con formaldehido. El inóculo presente en los tubérculos-semillas retardó la emergencia de 23,9% de las plantas y dio origen a grandes lesiones circundantes en los tallos subterraneos de más de 90% de las plantas. Una alta incidencia de lesiones en los tallos aéreos y de desarrollo himenial estuvo también asociada con el inóculo presente en los tubérculos-semillas. Sin embargo, el número de tallos por planta no tuvo diferencias significativas entre los tratamientos. Una inmersión de dos minutos en una solución acuosa al 1,85% de formaldehido eliminó la mayor parte sino el total del inóculo presente en los tubérculos-semillas.
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Scientific paper No. J-202, University of Alaska, Agricultural and Forestry Experiment Station, Fairbanks, Alaska 99775.
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Carling, D.E., Leiner, R.H. & Westphale, P.C. Symptoms, signs and yield reduction associated with Rhizoctonia disease of potato induced by tuberborne inoculum ofRhizoctonia solani AG-3. American Potato Journal 66, 693–701 (1989). https://doi.org/10.1007/BF02896825
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DOI: https://doi.org/10.1007/BF02896825