Germination characteristics and control of Abutilon theophrasti, a troublesome weed in corn fields.
Field experiments were conducted in Korea Republic during 1996 to investigate the distribution, germination characteristics, and efficacy of herbicides for the control of Abutilon theophrasti in corn [maize] fields. The regional distribution of A. theophrasti was higher in Gyenggi province than in Kangwon, Chungnam or Chonllanambug provinces because of the many dairy farms where fresh maize was used for silage. The optimum temperature for weed seed germination was 15-20°C and the germination rate was 73-93% in 1-5 cm of soil. Effective weed control was achieved when the crop was treated 10 days after seeding with pendimethalin 31.7% EC, linuron 50% WP and pendimethalin + linuron 25% EC, with an acceptable level of phytotoxicity.