Abstract
Three herbicide experiments were conducted at the Juana Díaz Research Center in 1980. Preemergence applications of chloramben (3-amino-2-5-dichlorobenzoic acid) at the rates of 4.48 or 8.96 kg ai/ha and postemergence application of DCPA (dimethyl tetrachtoroterephthalate) at 11.2 or 22.4 kg at/ ha provided an excellent control of predominant weeds in pumpkin—(Cucurbita moschata (Duchesne) Pair). There were no significant differences (P = .05) in pumpkin yields among herbicide treatments and hand-weeded or nonweeded checks. DCPA at 11.2 and 22.4 kg ai/ha and chloramben at 6.72 kg ai/ha controlled weeds excellently in cucumber (Cucumis sativus L.) and watermelon—(Citrullus lannatus (Thumb.) Matsm. & Nakai)—during the first 7 weeks. The highest yield of cucumber (20,925 kg/ha) was obtained with DCPA at 11.2 kg ai/ha, whereas the hand-weeded check yielded 16,594 kg/ha. The highest yield of watermelon (51,697 kg/ha) was obtained in the hand-weeded check plots, but good yields of watermelons were also obtained with DCPA at 11.2 kg ai/ha, chloramben at 3.36 kg ai/ha, bensulide (0,0-diisopropyl phosphorodithioate s-ester with N-(2-mercaptoethyl) benzenesulfonamide) at 5.6 kg ai/ha and naptalam (N-1-naphthylphthalamic acid) at 6.72 and 13.44 kg ai/ha, respectively.