[ca] Meloidogyne es un nematode fitoparasit que causa grans perdues de produccio d&#8217;hortalisses en el sector agricola. En els darrers anys s&#8217;han detectat sols supressius al nematode en els que la intensitat de la malaltia i la reproduccio del nematode es veu reduida de forma natural. En aquestes parcel·les es prioritza el control biologic per a gestionar les malalties del sol. Entre els productes registrats, es troben els que contenen Trichoderma com a ingredient actiu. Alguns estudis indiquen que Trichoderma pot induir resistencia a Meloidogyne en algunes especies vegetals, pero en actuar com a agent de control de patogens fungics tambe podria afectar als fongs antagonistes del nematode que confereixen la supressivitat del sol. Per aixo, l&#8217;objectiu d&#8217;aquest estudi va ser avaluar l&#8217;efecte de Trichoderma sobre la supressivitat natural d&#8217;un sol a Meloidogyne spp. Es va realitzar un assaig combinant la resistencia vegetal i l&#8217;aplicacio o no de Trichoderma asperellum T34 en el sol M10.43 supressiu a Meloidogyne. El tractament amb T34 es va fer a la meitat del planter de tomaquet resistent cv. Monica i a la meitat del planter susceptible cv. Durinta 7 dies abans de trasplantar i, posteriorment, en el moment del trasplantar a rao de 4 ml de concentracio 0&#8217;04 g/L per planta. Les plantes no tractades van rebre el mateix volum d&#8217;aigua. Totes les plantes van ser inoculades amb 1 juvenil de segon estadi per cm3 de sol i es van mantenir en hivernacle durant 2 mesos. En finalitzar es va determinar el pes sec aeri, el pes fresc radicular, el nombre d&#8217;ous del nematode, el percentatge de parasitisme i es van identificar els fongs aillats. Els resultats van mostrar una major biomassa aeria i radicular de la varietat resistent inoculada amb Trichoderma, pero no de la susceptible. La reproduccio del nematode va ser menor en les plantes tractades amb T34 independentment de la varietat, pero el percentatge de parasitisme d&#8217;ous en el cv. Durinta tractat amb T34 va ser menor que sense tractar. El fong aillat dels ous del nematode era Pochonia chlamydosporia..&#8221;

[en] Meloidogyne is a phytoparasite nematode that provokes great vegetable production losses in the agricultural sector. During the last years, soils suppressive to the nematode have been detected, where the intensity of the disease and the reproduction of the nematode is naturally reduced. In these plots, the biologic control to handle with the soil diseases is prioritised. Among the registered products, we can find those which contain Trichoderma as an active ingredient. Some studies show that Trichoderma can induce resistance to Meloidogyne in some vegetable species, but when acting as an agent to control fungal pathogens, it could also affect the antagonistic fungus in the nematode which confer the suppressiveness of soil. That is why the object of this study was to evaluate the effect of Trichoderma on the natural suppressiveness of soil to Meloidogyne spp. A test combining the vegetable resistance and the application or non-application of Trichoderma asperellum T34 to the soil suppressive to Meloidogyne was carried out. The treatment with T34 was applied in the tomato resistant plant cv. Monika and in the susceptible tomato plant cv. Durinta 7 days before transplanting and later on, at the moment of transplantation with 4 mL in a concentration of 0&#8217;04 g/L per plant. The plants that were not treated received the same amount of water. The plants were inoculated with 1 second stage nematode per cm3 of soil. The plants were kept in a greenhouse for 2 months. At the end of the process, we determined the dry aerial weight, the radicular fresh weight, the number of nematode eggs and the parasitism rate and we identified the isolated fungus. The results showed us a bigger aerial and radicular biomass of the resistant variety inoculated with Trichoderma, but not of the susceptible one. The reproduction of the nematode was lower in the plants treated with T34, regardless of the variety, but the egg parasitism percentage in the cv. Durinta treated with T34 was lower than in the non-treated ones. The isolated fungus found in the nematode eggs was Pochonia chlamydosporia.&#8221;