This research was throughout 2018-2020, filamentous fungi of agricultural importance were isolated from the Cerro Las Tetillas, located in the municipality of Salvatierra, Guanajuato. The hill was divided into three strata: upper, middle and lower. Two hundred soil samples were taken at depths of 0-15 and 15-30 cm. These were processed in the biology laboratory, belonging to the Higher Technological Institute of Salvatierra. Two isolation techniques were used: direct seeding and serial dilutions, over Petri dishes with potato dextrose agar culture medium and 100 mg of streptomycin to control bacteria. One hundred and thirteen axenic strains corresponding to 16 genera identified from “Cerro Tetillas” were obtained. At the upper stratum, 13 genera were identified, while in the middle and lower strata, nine genera were identified in each one of them. The diversity of soil fungi found in the different strata of the hill may be due to physicochemical characteristics of soil, native vegetation, interaction and abundance of soil fungi species, human disturbance and rain runoff.

The objective of this research was to evaluate six commercial products used for the protection of seeds against pests and diseases. The products were Poncho, Nipsit Inside, Allectus 150, Allectus 722, Regent Ultra and Cruiser 350 FS. The experiment was established in the town of Puerta del Monte, belonging to the municipality of Salvatierra, Guanajuato, in a random block design with seven repetitions. The evaluated variables were plant height, stem diameter, root length, present populations of fall armyworm, cutworms, thrips, diabrotica and blind hens. The most efficient treatment on the protection of pests in the cultivation of maize in its stage V4-V6 (most vulnerable stage) was the Nipsit Inside, this according to the results that were obtained in the four weeks of evaluation and according to the statistic analysis. Nipsit Inside is an insecticide that showed a wide range of protection in addition to presenting superior yields and better quality in the ears. Poncho is the second alternative to be used because it has very similar characteristics to Nipsit Inside in most of the variables evaluated.