The present study aimed to evaluate the influence of the environment on the population of Mahanarva spectabilis in two areas of the municipality of Apuí, Southern Amazonas. To capture the insects, we used traps made of PET bottles painted in fluorescent yellow, filled with water and detergent. The captured insects were placed in 70% alcohol in flasks duly identified for shipment to the Laboratory of Plant Health of IEAA / UFAM. The basis of taxonomic identification were morphological peculiarities at the level of family, genus and species. Fifteen (15) traps were set in the experimental design, 20m apart, with three (3) repetitions with five (5) traps. The area of each repetition was 400 m², totaling 1200 m² for each pasture area (A1 and A2), A1 with a larger green area around it and A2 with larger deforestation around it. Solar Radiation (KJ/m²), Temperature (°C), Relative Air Humidity (%) and Rainfall (mm) were the climatic parameters used. Other factors such as pasture condition and surrounding forest cover were considered for the environmental parameter. The means of the populations were submitted to analysis of variance (ANOVA) and compared with Tukey's test (P<0.05), by SISVAR Software version 5.6. There was a significant difference between the total means of M. spectabilis population density when compared between the two areas. The highest means (20.0) were observed in the pasture area (A2), inserted in the middle of areas with greater deforested area. The lowest averages (5.0) were observed in the pasture area (A1), whose surroundings have greater forest cover. The highest averages were found in A2, where there is greater deforestation and, consequently, a lower population of natural enemies. The climatological factor most related to the population was rainfall and relative humidity (RH), which increased simultaneously with the insect population in both areas.
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