Single applications of aldicarb 15 granular (G) at 37 and 75 kg/ha applied to the soil in March or April were compared with a foliar spray program and untreated control trees at four citrus grove locations for 2 yr (1983–84). Arthropod and citrus nematode population levels, tree growth, and fruit yield were monitored. Arthropods that were monitored included Phyllocoptruta oleivora (Ashmead) mostly on fruit, and Eutetranychus banksi (McGregor), Panonychus citri (McGregor), Dialeurodes citrifolii (Morgan), Lepidosaphes gloveri (Packard), Cornuaspis beckii (Newman), Aonidiella citrina (Coquillett), Coccus viridis (Green), Parlatoria pergandii Cornstock, Saissetia oleae (Olivier), and Ceroplastes floridensis Cornstock on leaves. Plant-parasitic nematodes recovered from soil and root samples were Tylenchulus semipenetrans (Cobb) and Pratylenchus brachyurus (Godfrey) Filipjev & Schuurmans Stekhoven. Aldicarb 15G at both rates provided comparable activity ranging from 13 to 20 wk control of P. oleivora and substantially reduced fruit injury due to russeting. Aldicarb at both rates reduced nematode populations and increased fruit yield at harvest in three of four grove sites.