Maize is the main crop for Mexicans; however, it is affected by species of fungi causing ear rot. This research aimed to evaluate the effect of T. asperellum T11, T. harzianum T1 4 y T. longibrachiatum T1 40 on some agronomic variables of four maize genotypes. The seeds of the genotypes H-515, Zapata 7, and H-507 were treated with a suspension of Trichoderma spp. to 1 × 10 8 spores mL -1 , using a control (untreated seed), and Benomyl as chemical control. The planting was in Morelos, in a completely random block design with a factorial arrangement. The ear rot was natural. Data were obtained at the end of the crop cycle and processed in SAS 9.4 <sup>®</sup> . H-515 genotype had the greatest effect on the treatment of maize seeds with Trichoderma spp. (5.562 kg); T. asperellum T11 was the strain that stood out with a mean yield of 50 ears in an area of 16 m 2 of 4.904 kg, and control of 4.448 kg. Our results are an economic option for farmers to contemplate the use of Trichoderma and obtain its benefits.
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