Weed Control J 2025; 24: e202500810

ISSUE Cover

Selectivity of herbicides to Lupinus albus applied in pre- and post-emergency

DOI: 10.7824/wcj.2025;24:00810

Abstract:

Background:

Lupin is a legume used for human and animal consumption, ground cover, and weed control. However, given the weeds’ interference, there is still a need for registered herbicides to aid in the lupin cultivation process.

Objective:

To evaluate the selectivity of herbicides applied in pre- and post-emergence stages of lupin cultivation.

Materials and Methods:

Two experiments were conducted in a controlled environment at 23–25 °C and under a 12-hour photoperiod, in a completely randomized design with five replicates. The pre-emergence treatments were: trifluralin; S-metolachlor; diclosulam; clomazone; flumioxazin; and sulfentrazone, and the post-emergence treatments were bentazon; chlorimuron-ethyl; clethodim; fluazifop-p-butyl; haloxyfop-methyl; and fomesafen, plus an unapplied control. Herbicide phytotoxicity assessments were performed 13, 23, 27, and 36 days after application (DAA). Root length and dry matter were determined 36 DAA.

Results:

The herbicides sulfentrazone, trifluralin, chlorimuron-ethyl, and fomesafen caused phytotoxicity to lupin at levels of 75%, 35%, 75%, and 35%, respectively. Among the pre-emergence herbicides, no negative effects were observed on shoot or root dry mass, or on root length. However, among the post-emergence herbicides, fomesafen reduced shoot and root dry mass, as well as root length, compared to the other herbicides.

Conclusion:

Sulfentrazone, trifluralin, chlorimuron-ethyl, and fomesafen are not selective for lupin, whereas S-metolachlor, diclosulam, clomazone, flumioxazin, bentazon, clethodim, fluazifop-p-butyl, and haloxyfop-methyl are selective at the tested doses.