The present experiment was carried out on the biological control laboratories from San Femando company. lt is located on Buenos Aires district county of Picota, San Martin Region, among the months of February to June of 2003, in order to finding the best sustrat for our hosted breeding and its influence in eggs production for massive breeding of parasite-like Trichogramma pretiosum, comparing three different sustrats as: soft com, wheat, and sorghum with three levels of Sitotroga cerea/ella egg concentration we use a totally randomized under a Design with factorial arrangement 3 x 3 with three repetitions whose factors were A1 corn, A2 wheat, A3 sorghum, and factor 81 0,5 g of Sitotroga eggs, 82 0,75 g of Sitotroga eggs, A3 1,0 g of Sitotroga eggs, making a total of 9 treatments and three repetitions, the gatherings of posturas of Sitrotroga cerea/ella were evaluated each 2 days until 75...