Annual ryegrass

Page last updated: Thursday, 12 December 2019 - 11:59am

Tactics for integrated weed management

There are many tactics that should be considered when developing an integrated plan to manage annual ryegrass (Lolium rigidum). These include: improving crop competition; burning residues; inversion ploughing; autumn tickle; using herbicides and more.

Table 1 Tactics that should be considered when developing an integrated plan to manage annual ryegrass (Lolium rigidum)
Tactic Most likely % control (range) Comments on use
Improving crop competition 50 (20-80) Optimum sowing rates essential. Row spacing >250mm will reduce crop competitiveness. Sow on time
Burning residues 50 (0-90) Avoid grazing crop residues. Use a hot fire back-burning into the wind
Inversion ploughing 95 (80-99) Bury seed 100mm deep. Use of skimmers on plough is essential for good results
Autumn tickle 15 (0-50) Only effective on previous year's seed-set
Fallow and pre-sowing cultivation 60 (0-90) Cultivation may lead to increased ryegrass in the crop. Use in combination with a knockdown herbicide. Use cultivators that bury seed. Cultivate during dry weather to reduce transplanting
Knockdown (non-selective) herbicides for fallow and pre-sowing control 80 (30-95) Avoid overuse of the one herbicide group. Add carfentrazone if annual ryegrass has less than two leaves
Double knockdown or ‘doubleknock’ 95 (80-99) Reduces the likelihood of glyphosate resistance. Use glyphosate followed by SpraySeed® 3-14 days later
Pre-emergent herbicides 70 (50-90) Note incorporation requirements for different products and planting systems. Rotate between herbicide groups
Selective post-emergent herbicides 90 (80-95) Apply as early as possible after the annual ryegrass has two leaves to reduce yield losses in cereals
Spray-topping with selective herbicides 80 (60-90) Apply before milk dough stage of annual ryegrass
Crop-topping with non-selective herbicides 70 (50-90) Note stage of crop compared to stage of annual ryegrass. Often not possible to achieve without crop loss
Pasture spray-topping 80 (30-99) Graze heavily in spring to synchronise flowering
Silage and hay – crops and pastures 80 (50-95) Most commonly used where there is a mass of resistant annual ryegrass growth. Follow up with herbicides or grazing to control regrowth
Renovation crops and pastures – green manuring, brown manuring, mulching and hay freezing 90 (70-95) Most commonly used where there is a mass of resistant annual ryegrass growth. Follow up with herbicides or grazing to control regrowth
Grazing – actively managing weeds in pastures 50 (20-80) Graze heavily in autumn to reduce annual ryegrass plant numbers. Graze heavily in spring to reduce seed-set
Weed seed collection at harvest 65 (40-80) Best results where crop is harvested as soon as possible before weeds lodge or shatter
Sow weed-free seed 85 (50-99) Reduces the risk of introducing resistant annual ryegrass to the paddock with crop seed

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