[en] Globodera pallida is a serious economic pest in worldwide planting of potatoes due to the severe crop losses they can cause. This study aimed to determine the relationship between soil temperature [degree-day accumulation (DD4)]and population development of G. pallida under the agroecological conditions of the Balearic Islands, Spain. Population changes were studied in 'Marfona' and 'Maris Peer' potato cultivars for three growing seasons. Differences in thepattern of occurrence of nematode life stages on the two potato cultivars were observed. In Maris Peer trials, secondstage juveniles (J2) hatching occurred about one month after planting (29 and 35 days), J2 root invasion at 57-56 days, and females in roots at 77 days with 540 DD4. In Marfona trials, these nematode stages occurred at 18-31days, 45-52 days and 59-73 days, the last one with 400 DD4. Hence, in Mallorca, G. pallida populations require at least 100 DD4 more in Maris Peer early potato than in the Marfona to reach the adult stage. Senescence in Maris Peer crops happened before most of the females have become brown cyst, suggesting that in this area the Maris Peer early cultivar could exert trap crop effects. The Marfona crop yield obtained at highest level of nematode infestation may indicate thatMarfona seems to be more tolerant to G. pallida than Maris Peer. The results contribute to the knowledge of thermaltime requirements of G. pallida populations under Mediterranean environmental conditions and can be a valuable tool to develop potato cyst nematode control strategies.

[es] Se estudia la din&aacute;mica poblacional de Globodera pallida y su relaci&oacute;n con las temperaturas del suelo [grados acumulados(DD4)] y con la fenolog&iacute;a de la planta hospedadora, en los cultivares de patata &lsquo;Marfona&rsquo; y &lsquo;Maris Peer&rsquo;, en las Islas Baleares, Espa&ntilde;a. Se observaron diferencias entre ambos cultivares respecto al patr&oacute;n de aparici&oacute;n de los estadiosvitales del nematodo. En Maris Peer, la eclosi&oacute;n de los juveniles de 2&ordf; edad (J2) se produjo un mes despu&eacute;s dela siembra (a los 29 y 35 d&iacute;as), la invasi&oacute;n radical de los J2 57-56 d&iacute;as despu&eacute;s, y la aparici&oacute;n de las hembras en lasra&iacute;ces 77 d&iacute;as despu&eacute;s, con 540 DD4. En Marfona, la aparici&oacute;n de los distintos estadios tuvo lugar a los 18-31 d&iacute;as, a45-52 d&iacute;as y a 59-73 d&iacute;as despu&eacute;s de la siembra respectivamente, este &uacute;ltimo con 400 DD4. Por tanto, en Mallorca, G. pallida necesita 100 DD4 m&aacute;s para llegar al estadio adulto en el cultivar Maris Peer que en Marfona. La senescencia del cultivo de Maris Peer se produjo antes de la maduraci&oacute;n de los quistes, por lo que en esta regi&oacute;n el cultivar de patata temprana Maris Peer podr&iacute;a actuar como cultivo trampa, impidiendo que G. pallida finalice su ciclo biol&oacute;gico. El cultivar Marfona presenta una mayor tolerancia a densidades altas del nematodo que Maris Peer. Los resultados obtenidos contribuyen al conocimiento de los requerimientos termales de las poblaciones de G. pallida en agrosistemas mediterr&aacute;neos y pueden tener una importancia fundamental para el dise&ntilde;o de estrategias de control.