Weed Control J 2025; 24: e202500879

Research Article

Pre emergent herbicides for volunteer Acacia mangium control in plantations in indonesia

DOI: 10.7824/wcj.2025;24:00879

Abstract:

Background:

Volunteer Acacia mangium represent a major challenge in Eucalyptus plantations due to the large seedbank remaining in the soil. The use of pre-emergent herbicides with residual effects is essential for achieving effective control of these weeds.

Objective:

To identify effective pre-emergent herbicides, with residual effects for controlling volunteer A. mangium in Eucalyptus plantations.

Methods:

Completely randomized design (CRD) was used with 4 replications. Trays (50 × 33 cm) were filled with a loamy topsoil from commercial plantations. Each tray was sown with 100 A. mangium seeds after dormancy-breaking treatment. Thirteen herbicide active ingredients were tested, with a control treatment (no herbicide). Active ingredients tested were Imazapyr, Metsulfuron-methyl, Triclopyr, Isoxaflutole, Indaziflam, Flumioxazine, Sulfentrazone, Oxyfluorfen, Pendimethalin, Metribuzin, Ametryn, Diuron and Saflufenacil. Herbicides were applied 1 day after seeds sowing and emerged seedlings were counted weekly until day 35 (first period assessment). After the first period was finished, all A. mangium emerged seedlings and remaining seeds were removed and 100 new A. mangium seeds were sown to each tray to test the residual effect. No additional herbicide was applied for the second period, which was assessed weekly until 35 days after second sowing.

Results:

Indaziflam, metribuzin, saflufenacil, sulfentrazone, and isoxaflutole were effective in controlling A. mangium, with <7.0% seedling emergence at 35 DAS, compared to 92.3% in the control.

Conclusions:

Indaziflam provided the best residual control, with 0.0% seedling emergence at the end of the second evaluation period, demonstrating high efficacy for volunteer A. mangium control in Eucalyptus plantations.