Abstract
A survey of New Brunswick potato fields with symptoms of early dying was conducted in September 1990 and 1991. Root lesion nematodes (Pratylenchus spp.) were detected in 43 of 46 fields in 1990 and in 37 of 43 fields in 1991. In 1990 and 1991 populations averaged 910 and 410 nematodes g-1 dry root and 1030 and 720 nematodes kg1 dry soil, respectively. Previous crops did not affect nematode populations, except in one comparison where the number of nematodes in potato roots in 1990 was higher when the previous crop was cereal than in 1991 when the previous crop was peas.Pratylenchus crenatus was more prevalent thanP. penetrans. Root-knot nematodes(Meloidogyne hapla) were detected at a few sites at low population levels only in 1991. In 1991,Verticillium albo-atrum was detected in all 37 potato fields where fungal analyses were conducted, and the average population was 350 propagules g1 dry soil. Soil populations ofV. alboatrum did not differ in fields in which either Russet Burbank or Shepody were being grown, nor did previous crops have any effect.Verticillium dahliae was detected in 17 fields at very low populations, usually below 1 propagule g1 dry soil. There were no significant correlations (P<0.05) between populations of P.crenatus orP. penetrans in soil or roots and populations ofV. albo-atrum orV. dahliae propagules in soil.
Resumen
En septiembre de 1990 y 1991 se llevó a cabo una inspección de los campos de papa de New Brunswick con síntomas de muerte temprana. Se detectaron nematodos de la lesión radicular (Pratylenchus spp.) en 43 de 46 campos en 1990 y en 37 de 43 campos en 1991. En las poblaciones de 1990 y 1991 el promedio fue de 910 y 410 nematodos por g de raices secas y 1030 y 720 nematodos por kg de suelo seco, respectivamente. Los cultivos anteriores no afectaron las poblaciones de nematodos, excepto en una comparación, en que el numéro de nematodos en las raices de la papa fue superior en 1990, cuando el cultivo anterior fue cereal, al de 1991, cuando el cultivo anterior fue guisantes.Pratylenchus crenatus prevalecií más queP. penetrans. Se detectaron nematodos del nódulo de la raíz(Meloidogyne hapla) en varios lugares en nivelés bajos de población sólo en 1991. Se detectóVerticillium albo-atrum in 1991 en los 37 campos de papa donde se realizaron análisis de hongos y la población promedio fue de 350 propágulos por g de suélo seco. Las poblaciones en el suelo deV. albo- atrum no se distinguieron en los campos en donde crecieron o Russet Burbank o Shepody, ni tuvo efecto ningún cultivo previo. Se dEtectóVerticillium dahliae en 17 campos en poblaciones muy bajas, usualmente debajo de 1 propágulo por g de suelo seco. No hubo correlaciones significativas (P<0.05) entre las poblaciones deP. crenatus oP. penetrans en el suelo o en las raíces y poblaciones deV. alboatrum o propágulos deV. dahliae en el suelo.
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Kimpinski, J., Platt, H.W., Perley, S. et al. Pratylenchus spp. andVerticillium spp. in New Brunswick potato fields. Am. J. Pot Res 75, 87–91 (1998). https://doi.org/10.1007/BF02883882
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DOI: https://doi.org/10.1007/BF02883882