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Italian rye-grass

Lolium multiflorum

Italian rye-grass is an annual or biennial grass weed which can grow up to 100cm. Although not at the same levels as black-grass, Italian rye-grass is increasing as a weed problem in many areas of the UK. Populations are being made worse because of the build- up of herbicide resistance and large seed banks.

LeavesGreen and hairless, rolled in the shoot
AuriclesSmall
LigulesShort and blunt, 1-2mm
Number of seeds produced per plantUp to 1000
Seed shedJune to September
Germination periodSeptember to November (94%), March to April (6%)
Germination depthUp to 6cm
Primary dormancyVariable, low
Does it have a secondary dormancy?Transient
Seed longevity2 - 3 years
Factor promoting germinationlight
Rate of seed decline with cultivations95%
Geographical locationItalian rye-grass is most commonly found in the arable areas of southern Britain where leys form part of the rotation.
Soil TypeThis weed thrives in areas where there are high nitrogen levels in soils and a good drainage.
RotationLengthen crop rotation to use alternative chemistry in different crops.
ImpactItalian rye-grass is competitive, a population of only 5 plants per m² will reduce yields by 5%.
Resistance riskHigh. EMR is the predominant mechanism for resistance, although ACCase TSR and ALS TSR have been found in a few populations.

More information on controlling this Arable Weed

Spray Application

Spray Application

Find out what our expert, Tom Robinson advises when it comes to spray application.

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Soil management

Soil management

Find out what our expert, Neil Fuller advises when it comes to soil management.

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Cultivation Principles

Cultivation Principles

Philip Wright talks on cultivation principles.

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Establishment

Establishment

Our top tips for establishment.

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Chemical Control

Chemical Control

Stuart Kevis and Iain Ford talk on chemical control.

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