Environmental concerns arising from the use of synthetic herbicides in plant management systems have led to an interest in the use of plant-derived compounds as natural herbicides. The inhibitory effects of compounds extracted with 50% methodanol from...
Environmental concerns arising from the use of synthetic herbicides in plant management systems have led to an interest in the use of plant-derived compounds as natural herbicides. The inhibitory effects of compounds extracted with 50% methodanol from corn (Zea mays L.) and pine (Pinus densiflora L.) were evaluated on Digitaria sanguinalis, Poa annua, Raphanus sativus, and Lolium perenne. The extracts were found to have inhibitory effects on seed germination and to have postemergence activity on the four species. The biological activity of the corn grain, stover, and root extracts were affected by heating by 135℃ or freezing / thawing treatments when applied at levels above 0.25 kg m^-2 based on dry weights of the powders before extraction. Heating reduced the activity of pine litter and bark extracts at all levels but the highest application level but had little effect onpine needle extracts.