During a 3-year period, pecan, Carya illinoinensis (Wangenh.) K. Koch, orchards were sampled to determine species and seasonal occurrence of phytophagus stinkbugs. Stinkbug adult and egg masses were collected from pecan and pistachio, Pistacia vera L., orchards, wild vegetation and neighboring annual crops in order to determine percentage of natural parasitism. Twelve species of Hemiptera associated to pecan trees were found: Brochymena sulcata and B. parva were found during all the vegetative stages; Chlorochroa ligata, Leptoglossus zonatus, L. clypealis, L. oppositus, L. phyllopus, Euschistus servus, and Nezara viridula were found throughout the nut-filling and shuck-opening periods. Thyanta custator was detected at midsummer. Largus cinctus appeared from late April to mid June, while Acanthocephala granulosa occurred sporadically. Thirteen species were collected from five Hymenoptera families parasitizing Hemiptera eggs and 10 species of Tachinid flies parasitizing Hemiptera adults of the previously mentioned bug species. The percentage of egg masses parasitized by Hymenoptera varied from 50 to 100% and affected 46 to 100% of the eggs of each egg mass. Tachinids parasitized between 1.0 and 30% of adult bugs.