Argentine stem weevil damage to high sugar ryegrass infected with AR1 under field conditions

Agronomic trials at cool (Gore) and warm (Palmerston North) temperate sites in New Zealand tested ten United Kingdom-bred (six diploids, four tetraploids) and two New Zealand-bred diploid ('Bronsyn', 'Impact') perennial and long-term hybrid ryegrasses (Lolium perenne, L. boucheanum) over two trial periods. Dry matter (DM) yields and persistence were better at the cool site but differential expression among cultivars for water-soluble carbohydrates (WSC) and yields was small compared with the warm site. The tetraploid cultivars generally had the highest concentrations of WSC but also on occasions had higher levels of crown rust, moderate DM yields and poorer persistence compared with diploids. Two of the tetraploid cultivars will be of value for their high WSC and good agronomic performance at the cool site. Some of the diploid UK cultivars expressed higher WSC and had similar or higher annual DM yields than some of the NZ-bred cultivars, and had high levels of resistance to crown rust. Overall, differences among cultivars in expression of WSC were small. Some differences occurred for seasonal DM yields with some UK cultivars having lower winter yields.

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Agronomic performance and water-soluble carbohydrate expression of selected ryegrasses at two locations in New Zealand

Hume

Hickey

Lyons

et al. 2010

New Zealand Journal of Agricultural Research

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Botanical survey of perennial ryegrass-based dairy pastures in three regions of New Zealand: implications for ryegrass persistence

Tozer

Chapman

Bell

et al. 2014

New Zealand Journal of Agricultural Research

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A botanical survey of 24 commercial dairy pastures ranging in post-sowing age and perennial ryegrass type (mid-season diploid, late-season diploid, tetraploid) was undertaken in each of Waikato-Bay of Plenty (BoP), Taranaki and Canterbury during autumn/winter. The mean perennial ryegrass proportion (85% of total DM) and tiller density (3252 m −2 ) was greatest in Canterbury and the broadleaved weed proportion lowest (2%). Conversely, Waikato-BoP had the lowest ryegrass proportion (59%), tiller density (1817 m −2 ) and greatest proportion of broadleaved weeds (15%), with Taranaki intermediate. Tiller density was greater in pastures sown with diploid rather than tetraploids (averaging 3033 vs. 1784 m −2 ). Grass grub (Costelytra zealandica, 11 m −2 ) populations were lowest in the youngest age category pastures where nematode populations were highest (80 g −1 dry soil). The soil seedbank was dominated by unsown species (with total species emergence averaging 4594 seeds m −2 ), with negligible ryegrass emergence.

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Pasture production and botanical composition of high sugar and control ryegrasses with or without endophyte under irrigation in Canterbury

Bryant

Parsons²,

Rasmussen³

et al. 2009

ProNZG

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Argentine stem weevil damage to high sugar ryegrass infected with AR1 under field conditions

Cited by 3 publications

References 14 publications

Agronomic performance and water-soluble carbohydrate expression of selected ryegrasses at two locations in New Zealand

Agronomic performance and water-soluble carbohydrate expression of selected ryegrasses at two locations in New Zealand

Botanical survey of perennial ryegrass-based dairy pastures in three regions of New Zealand: implications for ryegrass persistence

Pasture production and botanical composition of high sugar and control ryegrasses with or without endophyte under irrigation in Canterbury

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