Importance and approaches for the control of different photosystem-II-inhibitor resistant Chenopodium album biotypes in sugar beet and potatoes

• Main Authors: Agrikola, Yvonne, Petersen, Jan
• Format: Article
• Language: deu
• Published: Julius Kühn-Institut 2012-03-01
• Series: Julius-Kühn-Archiv
• Subjects: Fitness; Konkurrenz; Mais; Triazinresistenz; Triazinonresistenz; competition; fitness; maize; triazine resistance; triazinon resistance

Resistances in weeds for PS-II herbicides are well known. Since the end of the 1970s especially resistances to triazines in maize represented a problem. Today, because of the variety of alternative active ingredients in maize, this problem is considered to be solved. This is different in sugar beet and potatoes because hardly any new herbicides have been developed during the last 20 years. Chenopodium album is a major weed in all summer crops. In maize, resistance to triazines (target-site resistance (TSR) at position 264 on the D1 protein) is known. In recent years, new TSR in C. album (position 251 in Sweden and 218 in Lower Saxony, Germany) has been found. These biotypes exhibit resistances to triazinones and chloridazon but showed no cross-resistances to triazines. An outdoor pot trial with sugar beets and potatoes showed that higher dosages of ethofumesate in sugar beets and aclonifen in potatoes are able to control triazine and triazinone resistant C. album biotypes to certain extend or even completely, respectivly. A competition pot trial with maize and different C. album biotypes showed no significant differences in weed fitness concerning the parameters plant height, biomass and seed production.