"incession" - 1 õppematerjal

Weed Management Handbook

 Herbicide-resistant weeds • The inferited ability of a weed to survive a rate of herbicide, which would normally result in effective control • This happens trough evolutionary process, whereby a population changes from being susceptible to being resistant- • Happens when the same herbicide has been used over a period of years • Resistance can be passed from one generation to the next  Prevention of resistance Cultural control methods • Cultivation- incession tillage can bury seeds to a depth from which seedlings of most weeds are unlikely to emerge (5cm or deeper) • Crop rotation – many annual weeds are strongly associated with specific crops  Prevention of resistance Herbicidal control methods • Alternative herbicides – likely to have effect on resistant populations • Mixtures and sequences – use two or more herbicides which have different modes of actions • Herbicide rotations – rotation of