Crop type District Sow date Growth stage Brassica forage rape Canterbury March 4 leaf

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1 Friday, May 10, 2013 This edition includes: 1. From the field 2. Weekly suction trap capture of cereal aphids, including average weekly temperature 3. Field days with BFEA winners 4. International Herbage Seed Workshop (New Zealand) 1 From the field Many March and April sown cereals will be approaching growth stage 21 (main stem and 1 tiller). When cereals begin to tiller the effects of seed treatment insecticides becomes limited and you should consider the requirements for foliar insecticides. In white clover seed crops continue to monitor for clover root weevil adults which will be feeding on above ground tissue, primarily leaf tissue. Control these if plant growth is restricted. In second year crops monitor both above ground for adults and below ground for larvae (larvae look similar to grass grub larvae but have no legs and are about half the size). If larvae are in high numbers and close to the soil surface control may be applicable. Crop type District Sow date Growth stage Brassica forage rape Canterbury March 4 leaf Perennial ryegrass Mid Canterbury April 2 leaf/2 tillers Browntop Mid Canterbury March 2 tillers Winter wheat Canterbury February Main stem and 5 tillers Spring wheat Canterbury March Main stem and 1 tiller Spring wheat Canterbury April 2 leaf White clover Mid Canterbury March 2-3 true leaves Slugs: continue to monitor for slugs in all crops, many slugs have been observed throughout the wider Canterbury area over the past 10 days. In most cases these have included slugs of various ages suggesting that new generations are emerging and damage could occur for some time yet. Grass grub: continue to monitor crops where grass grub were seen last year or in rotation positions which are highly problematic e.g. following two seasons of white clover. Grass grub populations appear highly variable this season, possibly related to soil moisture over summer and the food source available 1

2 following egg hatching in Jan/Feb. In Mid Canterbury both very fat 3 rd instar larvae and very small 2 nd instar larvae have been observed in the last 10 days. The fat 3 rd instars will continue to feed for approximately another 8 weeks compared with the smaller instars which are only just becoming damaging now, these 2 nd instar larvae could feed though until September or later. Dig holes now to determine if/when grass grub may be an issue and devise a plan for dealing with potential issues before they arise. Be sure to check different soil types within the same paddock. 2 Weekly suction trap capture of cereal aphids The number of cereal aphids caught in the Lincoln suction trap between the 29 April and 5 May (week 5) 2013 was 40 and is shown in the graph below along with: - The weekly average number of cereal aphids caught in the Lincoln suction trap between (green line), and - The weekly number of cereal aphids caught in the Lincoln suction trap in 2005, a year of high BYDV incidence (red line) The cereal aphids caught in the Lincoln suction trap do not represent secondary spread of BYDV within a crop. Directly searching your crop will provide the best information about the incidence of cereal aphids in your crop. Searching is best done on sunny afternoons, looking at the underside of leaves. You can anticipate relatively high numbers of aphids until the end of May 2

3 Average weekly temperature The graph shows the average weekly temperature corresponding to the time aphids were caught in the Lincoln suction trap this year (blue line), calculated from average daily temperatures from NIWA CliFlo data for Lincoln (station no ) and: - The average weekly temperature between (green line), and - The average weekly temperature in 2005, a year of high BYDV incidence (red line) Generally, the warmer the temperature, the faster an aphid will develop into an adult. However other factors, such as amount of rain, can affect aphid development and survival. 3

4 3 Field days with Ballance Farm Environment Award Winners Greater Wellington Visit the property of the Greater Wellington Supreme Winners Michael and Karen Williams. Ahiaruhe Farm was described by judges as a very well organised business run by an inspirational young couple. Wednesday 15th May 1-5pm 209 Ahiaruhe Road, Carterton Field Day followed by a BBQ, and will be held wet or fine. Please bring a 4WD vehicle (no quad bikes). Please register your likely attendance to Angeline Colquhoun on or wellington@bfea.org.nz for catering /logistics. Otago Mitchell Webster Group Visit this intensive cropping operation and wholesale business producing bird and small animal feed, which is based on the Mitchell family s historic Rosedale farm at Weston, but covers 1380ha of arable land in North Otago. Wednesday 15 th May pm Venue: Starts at Weston Hall, Main Street, Weston, then buses provided for farm tour. BBQ lunch included from 12-1pm. Enquiries to Camille McAtamney on or otago@bfea.org.nz. 4 International Herbage Seed Workshop (New Zealand) Methven, Sunday 22 September Thursday 26 September 2013 The IHSG are holding a four day workshop in Methven in September. As part of this FAR are running a one day FAR Farmer Focus Day which will include talks from FAR and international research staff and visits to local farms to view trials. Registrations for both the four day workshop and FAR Farmer Focus Day are now open via the IHSG website The cost for growers is $30 for the FAR Day or $500 for the full event. Enquiries to ihsg@far.org.nz or phone the FAR office. The proposed programme for full event is: 4

5 Sunday 22 September pm Registration and drinks Monday 23 September 2013 am: Leave Christchurch by coach, tour of Lincoln Research Community pm: Arrive Methven in time for dinner (conference venue) Please book your own accommodation, the Methven Resort is recommended as that is where the Workshop will be held. See Accommodation page on this website. Tuesday 24 September 2013 Foundation for Arable Research Farmer Focus Day am: FAR and international speakers talks pm: Farm visits followed by evening meal on farm Wednesday 25 September 2013 am: IHSG workshop sessions pm: Field session AGM and dinner Thursday 26 September 2013 am: IHSG workshop sessions pm: Field session Return to Christchurch by coach end of workshop. Workshop registration covers all travel to and from Christchurch to Methven, field trips and associated travel, meals from lunchtime on Monday 23 September to lunchtime Thursday 16 September. Full registration includes the FAR Farmer Focus Day on Tuesday 24 September. Accommodation should be booked and paid for separately. This has been written by: Rob Craigie and Richard Chynoweth. Contact us Rob Craigie Richard Chynoweth NOTE: This FAR Crop Action Report was prepared with current information at the time of publication. Neither FAR or its staff may be held liable for any crop damage or loss from interpretation of the information contained within this or any edition of Crop Action. Information contained in this Crop Action is intended as a guide only. All previous Crop Actions and other publications can be viewed on the FAR website: Please contact the FAR Office if you would like to unsubscribe from Crop Action, or change your address. 5