Models for the management of herbicide resistant weed populations
Zwerger, P. (Hohenheim Univ., Stuttgart (Germany). Inst. fuer Phytomedizin) | Walter, H.
In the paper presented here two theoretical models are used to demonstrate which factors are of importance for the dynamics of herbicide resistance in a weed population and how these factors can be employed in the development of anti-resistance strategies. A high initial frequency of resistance alleles in a population, outbreeding, dominance of inheritance, a short persistence of the seed bank in the soil and the lack of a fitness penalty for resistant vs. susceptible biotypes of a weed species favor the occurrence and increase of herbicide resistance along with agronomic factors having a positive influence on the development of said weed species. Important factors in the development of anti-resistance strategies are an early estimate of the resistance risk in a weed population and of the herbicides plus other control measures used in its management, the investigation and monitoring of populations reported as resistant under field conditions and harmonized recommmendations for the use of herbicides and other management schemes, pointing out the risk of the evolution of resistance and cross-resistance, and how to minimize it. Such concepts and strategies, agronomical measures included, can only be developed and implemented successfully with harmonized input of the herbicide manufacturers, the distributers, the research- and extension service and last but not least the farmerShow more [+] Less [-]