A survey on species richness, abundance and phenology of herbivores, predators and parasitiods was carried out in a horticultural organically grown field in Vicosa, MG, Brazil. Among the herbivores, aphids were dominant. Among the parasitoids Braconidae was dominant and to a lesser extent Eucoilinae (Cynipidae), Chalcididae and Pteromalidae. Frequent predators belonged to Anthocoridae (Hemiptera). The most heterogeneous plot (with greater number of plants growing simultaneously) had the most diverse and abundant fauna of herbivores, predators and parasitoids. Pests did not economically damaged the plants during the time of the survey.