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espanolEn un huerto comercial de citricos en la localidad de Rafelguaraf, Valencia, se detecto una alta densidad de poblaciones de Tylenchulus semipenetrans sobre arboles adultos de Poncirus trifoliate (L.) Raf. Este patron estaba considerado hasta ahora en Espana como resistente a poblaciones de T. semipenetrans. Se caracterizo el biotipo de la poblacion Valencia de T. semipenetrans de acuerdo a su rango de hospedantes diferenciales. Siete meses despues de la infestacion bajo condiciones de invernadero, la poblacion Valencia demostro una alta capacidad para reproducirse sobre los cultivares Bennecke y Rubidoux de P. trifoliate y sobre limon rugoso (Citrus jambhiri Lush). Ademas fue capaz de infestar la vid 141-R (Vitis berlandieri x V. rupestris Scheele), pero no el olivo (Olea europaea L.) cv. Arbequina. Estos resultados observados sobre los hospedantes diferenciales demuestran que la poblacion Valencia se comporta de modo similar al biotipo EnglishHigh population densities of Tylenchulus semipenetrans Cobb were detected on mature Poncirus trifoliate (L.) Raf. rootstocks in a commercial citrus orchard in Rafelguaraf, Valencia, Spain. Until now, this rootstock was considered resistant to populations of T. semipenetrans. The biotype of the nematode was characterised according to its host range. Under greenhouse conditions, it proved to be very capable of reproduction on the Bennecke and Rubidoux cultivars of P. trifoliate and on rough lemon (Citrus jambhiri Lush) at seven months post-infestation. It was also able to infest grapevine 141-R (Vitis berlandieri x V. rupestris), but not cv. Arbequina olive (Olea europaea L.). These results suggest this Valencia population of T. semipenetrans behaves similarly to the Poncirus biotype.

Short communication. Identification of the Poncirus biotype of Tylenchulus semipenetrans in Valencia, Spain