Tolerance of selected weed species to broadcast flaming at different growth stages

► Overall response to flaming varied among species, growth stage and propane dose ► Broadleaf weeds were more susceptible to flaming than the grass regardless of the growth stage ► The tolerance of both grassy and broadleaf weed species to broadcast flaming increased with increase in plant size ► A dose of 76 kg/ha of propane was needed to obtain 90%\ dry matter reduction for 7-leaf (L) barnyardgrass compared to much lower doses of 40, 49, 55, 56 and 51 kg/ha propane for 8-L bindweed, 6-L kochia, 10-L morning glory, 7-L velvetleaf and 5-L Venice mallow, respectively ► Broadcast flaming has potential for control or suppression of weeds in organic farming.