Control and seed production of annual ryegrass in wide row lupins in the Western Australian wheatbelt

Document Type

Conference Proceeding

Publication Date

5-2008

Conference Title

16th Australian Weeds Conference (2008) - Hot Topics in the Tropics

Place of Publication

Cairns

ISBN

978-0-646-48819-6

Keywords

Wide row lupins, inter-row spraying, Sprayshield, annual ryegrass, glyphosate, Spray.Seed.

Disciplines

Agricultural Science | Agronomy and Crop Sciences | Weed Science

Abstract

Two experiments were conducted at Wongan Hills and Merredin in 2006 to examine on-row and inter-row weed control, and seed production of annual ryegrass in wide row lupins in Western Australia (WA). At Wongan Hills, annual ryegrass density on the inter-rows was reduced 99–100% by inter-row Spray. Seed® (paraquat + diquat) or glyphosate; 61–63% by inter-row cultivation and 34% by standard practice (simazine + clethodim) in a lupin crop sown in 52 cm wide rows. Crop damage was 1% with inter-row Spray. Seed, 6–12% with inter-row glyphosate and 29–44% in inter-row cultivation treatments. Lupin grain yield loss was 20% in the untreated control, 11–14% with inter-row Spray.Seed, 25–31% with inter-row glyphosate and 39–55% in inter-row cultivation. On-row seed production of annual ryegrass was reduced 33–54% by a banded application of simazine or metolachlor except in one treatment. Inter-row seed production of annual ryegrass was reduced 100% with inter-row glyphosate or Spray.Seed applications, 58–68% with the inter-row cultivation and 26% in the standard practice. At Merredin, inter-row annual ryegrass density was reduced 98–99% by inter-row glyphosate, 64–65% by inter-row Spray.Seed, 53% by inter-row cultivation and 100% by the standard practice in a lupin crop sown at 66 cm wide rows. Crop damage was 4–8% with inter-row glyphosate application, 9–14% by inter-row cultivation and no damage was recorded with inter-row Spray.Seed application. Lupin grain yield loss was 21% in the untreated control; 1–3% with inter-row glyphosate, 11–14% with inter-row Spray. Seed and 5–14% in inter-row cultivation. Results showed that glyphosate was as effective on inter-row annual ryegrass as Spray.Seed but was more damaging to lupins than Spray.Seed suggesting that Spray.Seed is an alternative to glyphosate for inter-row weed control in wide row lupins. Given that glyphosate resistance in annual ryegrass is on the rise and paraquat resistance in annual ryegrass has not yet been reported in Australia, this is a promising alternative.

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