The effects of tobacco thrips (Frankliniella fusca Hinds) control and herbicides on peanut (Arachis hypogaea L. ‘Florigiant’) canopy development and competition with large crabgrass [Digitaria sanguinalis (L.) Scop. # DIGSA] were examined in field experiments during 1983 and 1984. Greater early-season peanut canopy development generally occurred when tobacco thrips were controlled with aldicarb [2-methyl-2-(methylthio) propionaldehyde-O-(methylcarbamoyl)oxime]. Tobacco thrips control did not affect large crabgrass dry weights or peanut seed yields with no herbicide, alachlor [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide], vernolate (S-propyl dipropylcarbamothioate) + benefin [N-butyl-N-ethyl-2,6-dinitro-4-(trifluoromethyl)benzenamine] + alachlor, and handweeding + sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio) propyl]-3-hydroxy-2-cyclohexen-1-one}. Averaged across weed control levels, large crabgrass dry weights with and without aldicarb were 320 and 310 g/m2 in 1983, and 260 and 250 g/m2 in 1984, respectively. Peanut seed yields with and without aldicarb were 1550 and 1630 kg/ha in 1983, and 2870 and 2920 kg/ha in 1984, respectively.