Key Points
Two trials were sown (in Mid Canterbury and the Manawatu) in the 2005/06 season to determine the susceptibility of lupins to a range of herbicides using a log sprayer.
- Two species were tested, L angustifolius (sweet lupin) and L albus (white lupin).
- In the Manawatu, crop damage was minimal in both species, when herbicide was applied pre-emergence. When the herbicide was applied post crop emergence, there was significant damage at higher rates of the broadleaf herbicides.
- In Canterbury the white lupin was more tolerant than the sweet lupin, but both species were seriously damaged by most herbicides applied at label rates, possibly because the high weed pressure caused stress to the lupins.
- Weed control was dependent on weed pressure, which was very high at the Canterbury site, the weed species mix and the herbicide spectrum.
- Overall, Simazine (pre-emergent) gave the best compromise between good weed control and minimal crop damage.