Grass weed management in transplanted eggplant


Eggplant--Weed control--Puerto Rico

How to Cite

Semidey, N., Almodóvar, L., & Caraballo, E. (1990). Grass weed management in transplanted eggplant. The Journal of Agriculture of the University of Puerto Rico, 74(2), 133–138.


Two field weed control experiments with transplanted eggplant (Solanum melongena L.) were conducted at the agricultural substation in Lajas in 1984-85 and one in Juana Díaz (1985). In Lajas (1984) a single postemergence application of either fluazifop-P (R)—2— (4—[5—(trifluoromethyl)— 2—pyridinyl] oxy phenoxy) propanoic acid sethoxydim [2— (1—ethoxyimino) butyl] —5—[2—(ethylthio) propyl—3 hydroxy—2—cyclohexen— 1—one or quizalofop (±2— (4— [(6-chloro— 2-quinoxalinyl) oxy — phenoxy] — propanoic acid) gave excellent (90% or more) control of grasses for 10 weeks after transplanting eggplant. Eggplant yields increased substantially with manual cultivation after the herbicide applications. In a second experiment in Lajas in 1985 excellent 10-week control of grasses was provided by the combination of preemergence DCPA (dimethyl 2,3,5,6— tetrachloro—1, 4— benzenedicarboxylate) at 8.4 kg ai/ha followed by manual weedings, or the postemergence applications of either fluazifop-P (0.28 kg ai/ha), sethoxydim (0.27 kg ai/ha) or quizalofop (0,28 kg ai/ha) 2 weeks after a hand weeding. The highest yield (27,117 kg/ha) was obtained in plots with DCPA application plus 3 manual weedings. In a similar experiment at Juana Díaz (1985) the combination of a manual weeding at 3 weeks plus the postemergence fluazifop-P application at 5 weeks was the only treatment that really controlled grasses during the first 10 weeks. Although the highest crop yield (29,474 kg/ha) at Juana Díaz was obtained in plots with 3 manual weedings without herbicides, statistically comparable yields were obtained in plots with DCPA plus manual weedings at 3 and 5 weeks, with sethoxydim plus one weeding, and with fluazifop plus one weeding.


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