P. Niemann et al., Medium-term consequences of enhanced weed-thresholds in cereals on weed infestation in the succeeding crops, Z PFLANZENK, 2000, pp. 281-290
Citations number
10
Categorie Soggetti
Plant Sciences
Journal title
ZEITSCHRIFT FUR PFLANZENKRANKHEITEN UND PFLANZENSCHUTZ-JOURNAL OF PLANT DISEASES AND PROTECTION
Changing economic backgrounds could lead to higher damage thresholds for we
eds in cereals. To investigate the consequences in terms of increasing weed
iness due to applying these thresholds, field experiments were conducted on
four sites for five years. The tested thresholds yielded in accelerated we
ed density in the succeeding crops but did not lead to higher costs for con
trol measures compared to routine treatments. Weed infestation was governed
by the seed input as well as by the crop grown and the year. Herbicide sav
ings with the new threshold were limited because only at one site the weed
density ranged between the old and the new threshold level. Higher weed thr
esholds are acceptable only in high-input cropping systems because weed com
petition increased and wheat market quality decreased in low-input systems.