Efficacy of Interrow Weed Control Techniques in Wide Row Narrow-Leaf Lupin

Abstract

The sharp decline in the area of lupin grown in Australia is partly attributed to the failure to control herbicide-resistant weeds in narrow-leaf lupin crops grown with the conventional 25-cm-wide row spacing. Growing lupin with wider row spacing allows for interrow weed control by nonselective herbicides using a sprayshield or physical methods. During 2003 to 2006, two experiments conducted at five sites evaluated the efficacy of interrow weed control techniques in narrow-leaf lupin crops grown in 55- to 65-cm-wide rows within the Western Australia wheatbelt. Interrow herbicides were applied POST using sprayshields, intrarow herbicides were banded on lupin rows at seeding, and interrow weeds were mowed using a garden mower. The main weed species at each site was rigid ryegrass, blue lupin, or wild radish. Paraquat plus diquat applied on the interrow of the lupin crop with sprayshields controlled up to 100% of weeds between rows, leading to increases in lupin grain yield in most of the sites. Glyphosate alone, a mixture of glyphosate plus metribuzin, and glyphosate followed by paraquat plus diquat also controlled interrow weeds, but did not increase lupin grain yield at any site. Thus, paraquat plus diquat is a better choice for interrow weed control in wide row lupin than glyphosate. Mowing did not improve weed control, but mowing followed by paraquat plus diquat increased lupin grain yield at one site. Regression models predicted that there was a strong relationship between weed biomass and lupin grain yield.

Management of ACCase-Inhibiting Herbicide-Resistant Smooth Barley (Hordeum glaucum) in Field Pea with Alternative Herbicides

“…The results indicate that smooth barley is highly competitive against field pea and unless effective control tactics are used, it can cause large yield losses (Table 3, Figure 2). It is widely known that field pea is less competitive than cereals (Lemerle et al 1995), and large yield penalties due to grass weed competition have been previously reported in legume crops (Hashem et al 2011;McDonald 2003).…”

Alternative Herbicides for the Control of Clethodim-Resistant Rigid Ryegrass (Lolium rigidum) in Clearfield Canola in Southern Australia

“…High fecundity in rigid ryegrass enables this species to readily replenish its seedbank and ensure weed infestation in the following crops. Rigid ryegrass is highly competitive against broadleaf crops and can significantly reduce productivity (Hashem et al 2011;Lemerle et al 1995). In southeastern Australia, rigid ryegrass is considered the most important weed of canola crops (Lemerle et al 2001).…”

Herbicide Application Strategies for the Control of Rigid Ryegrass (Lolium rigidum) in Wide-Row Faba Bean (Vicia faba) in Southern Australia

“…Traditionally this practice was confined to summer crops such as cotton, sorghum, and maize, which are grown in northern Australia on rows $ 0.5 m wide. However, WR cropping has been adopted by some lupin growers in Western Australia (Collins and Roche 2002;Hashem et al 2008Hashem et al , 2011. Crops such as lupins, DOI: 10.1614/WT-D-11-00030.1 * Research Officer and Associate Professor, School of Agriculture, Food, and Wine, The University of Adelaide, South Australia, Australia 5064.…”

“…Resistance development in rigid ryegrass to most mode-ofaction groups has been of major concern to growers and there have been some changes to its management in crops. One approach being explored, particularly by growers practicing precision agriculture, involves cultivation of pulse crops on wide rows (WR) to allow directed spraying of weeds between the crop rows with nonselective herbicides (Hashem et al 2008(Hashem et al , 2011Peltzer et al 2009). Traditionally this practice was confined to summer crops such as cotton, sorghum, and maize, which are grown in northern Australia on rows $ 0.5 m wide.…”

“…Traditionally this practice was confined to summer crops such as cotton, sorghum, and maize, which are grown in northern Australia on rows $ 0.5 m wide. However, WR cropping has been adopted by some lupin growers in Western Australia (Collins and Roche 2002;Hashem et al 2008Hashem et al , 2011. Crops such as lupins, chickpeas, and faba beans appear to be well suited to cultivation on WR as they can maintain yield through their capacity to branch and fill the interrow space (Felton et al 1996).…”