Agro-economic analysis of the use of glyphosate in UK agriculture

1. Agro-economic analysis of the use of glyphosate in UK agriculture James Clarke [email_address] Sarah Wynn & Sarah Cook Roundup Ready® Maize Symposium The European Perspective 23-24 March 2010, Brussels

6. Herbicide use in UK – area sprayed (ha) and active substance (kg) – arable crops 2008 Source: Pesticides Usage Survey, 2008 Approval ceased 2008

9. Typical glyphosate use in UK Pre-harvest Pre-planting Pre-emergence

12. Benefits of pre-harvest use 10% in wheat, 15% in OSR, greater in spring crops Elytrigia repens control: 100 shoots/m 2 could cause at least 10% yield reductions Weed control Increased combine efficiency – increased speed of travel Lower harvest cost 3.5L/ha fuel saved General Dries out green material lowers harvest moisture (1-2%) Uneven or weedy crops Benefit Timing

13. Benefits pre-planting/pre-emergence Typical benefit 20% increase in yield Bare soil prior to planting reduces pest and disease infection Pre-planting Controls weeds and volunteer crops Stale seed beds Mode of action reduces herbicide resistance pressures Pre-planting and pre-harvest Benefit Timing

14. Value of key benefits of glyphosate 310 Reduce grass weeds, such as Alopecurus myosuroides , volunteers and perennial weeds Pre-planting of winter wheat 108 Desiccant and harvest aid, reduced drying and earlier harvest Pre-harvest in oilseed rape 56 Elytrigia repens control to prevent yield loss across a rotation, reduction in drying costs Pre-harvest in winter wheat Value (£/ha treated) Key benefits Use

16. Wheat and oilseed rape: major UK crops Source: Defra Statistics 2008, UK

17. Area treated with glyphosate in UK 2008 Source: Pesticides Usage Survey, 2008 1.20 1.39 1.25 1.17 1.14 1.18 1.16 No of applications 41 51 73,000 Beans 87 45 19,000 Peas 96 70 529,000 OSR 94 19 23,000 Oats 83 26 175,000 Spring barley 77 25 120,000 Winter barley 78 27 651,000 Wheat % Pre-harvest % crop treated Area treated (spray ha) Crop

18. % area treated, by crop, with glyphosate Sources: Pesticide Usage Survey 2008 (PUS), Agronomist/Farmer meetings in West & East of England

19. % area treated, by crop, with glyphosate Sources: Pesticide Usage Survey 2008 (PUS), Agronomist/Farmer meetings in West & East of England

20. Yields reduced without glyphosate

21. Yields reduced without glyphosate

22. Estimated % loss of production to UK, by crop, without glyphosate

23. Estimated loss £m to UK, all crops, without glyphosate

24. Estimated losses £m, by crop, without glyphosate Sources: Pesticide Usage Survey 2008 (PUS), Agronomist/Farmer meetings in West & East of England

32. Agro-economic analysis of the use of glyphosate in UK agriculture James Clarke [email_address] Sarah Wynn & Sarah Cook Roundup Ready® Maize Symposium The European Perspective 23-24 March 2010, Brussels