Malting barley disease control Why, When and What? Liz Glynn & Jim Grace Teagasc CELUP Oak Park Crop Research

Transcription

1 Malting barley disease control Why, When and What? Liz Glynn & Jim Grace Teagasc CELUP Oak Park Crop Research

2 Why? To protect yield potential To control disease to achieve that yield potential

3 Understanding how yield is achieved

4 High disease pressure Oak Park 2012 Oak Park Mar Apr May Jun Jul Mar Apr May Jun Jul Oak Park 2014 Oak Park Mar Apr May Jun Jul 0.0 Mar Apr May Jun Jul

5 Wet weather disease Rhynchosporium Ramularia Net blotch Head blight

6 The Effect of Rhynchosporium Resistance Rating on Fungicide Requirements for Disease Control in spring barley (2014) Deirdre Doyle & Joseph Lynch 3 varieties: Sanette (8), Concerto (5), KWS Irina (4) AFBI ratings Disease assessments: GS30, GS39, GS55 & GS77 Treatment Rate (proportion of full label rate) Untreated *** Proline ¼, ½, Full, Double Siltra xpro ¼, ½, Full, Double Spray timings GS30, GS39-45

7 Higher disease resistance reduced disease severity 80 Avg. Rhyncho Untreated GS GS39 GS55 Leaf 1 Leaf 2 Leaf 3 Leaf Sanette Concerto Irina Sanette Concerto Irina Sanette Concerto Irina

8 And Increased Green Leaf Retention Leaf 3 GLA Untreated Leaf 2 GLA Untreated Leaf 1 GLA Untreated Sanette Concerto Irina GS 39 GS 55 GS GS 39 GS 55 GS GS 39 GS 55 GS 77 The most resistant variety Sanette maintained the highest % GLA across growth stages The lower resistance varieties; Concerto and KWS Irina maintained lower % GLA

9 Effect of Dose Rates on Reducing Disease Proline Siltra xpro AUDPC Sanette Concerto Irina AUDPC Sanette Concerto Irina Dose Rate Dose Rate Fungicide significantly reduced disease but there was no difference between fungicide rates There was no difference between varieties when fungicide treated Visible disease was delayed but not prevented by a high resistance score

10 Fungicide response same for all varieties 11.0 Proline 11.0 Siltra xpro t/ha 8.0 t/ha Sanette Concerto Irina Rate Rate Economic optimum rate of 0.4 of a rate, was the same for all varieties No significant difference in yield over ¼ of a rate of either product

11 Yield and yield components of varieties as affected by differing fungicide treatments Cultivar Ears/m 2 Grains/m 2 TGW, g Yield, t/ha Sanette (8) 940 a a a Concerto (5) 785 b b b KWS Irina (4) 963 a a a Significance. Cultivar < <.001 Fungicide <.001 <.001 <.001 Cv x Fung Sanette and Irina had significantly higher yield than Concerto Due to high grain numbers, as a result of high ear number Varieties all responded to fungicide in a similar way

12 Reminder

13 When? Determining optimum timing sites (Oak Park, Wexford, Wicklow, Kildalton) Siltra xpro (1.0l/ha)

14 When? 0.9 Individual timings t/ha Mid-late tillering GS31/32 GS39/49 GS59 Teagasc SB Timing Trial : 8 site seasons Fungicide: Siltra xpro 1.0l/ha

15 When? Fungicide programmes Mid-late tillering, GS31/32, GS39/49, GS59 Mid-late tillering, GS39/49 GS31/32, GS39/49 GS31/32, GS59 Untreated t/ha 1 st application at mid-late tillering to protect tillers 2 nd application at GS 39/49 (awns peeping) to keep crop green for grain fill No benefit from additional applications Delaying final application until GS 59/61 can reduce yield potential

16 What?

17 t/ha Untreated 2 SDHI's T1 SDHI/ T2 non- SDHI Low disease pressure Fungicide programme T1 Non SDHI / T2 SDHI No SDHI Margin (over untreated) Funicide spend Spring barley programmes trial sites Propino, SY Taberna Wicklow, Oak Park No significant differences between programmes Increased spend did not equate to increased yield

18 High disease pressure t/ha Margin (over untreated) spray fungicide programmes Fungicide spend Spring barley programmes trial 2013 Kildalton Azalea No significant differences between programmes Return on fungicide spend higher in high disease

19 Diseases Programme What? T1 (GS <30) Rhynchosporium Net Blotch (Mildew) (Rust) Mixtures SDHI/azole/Strob/multisite Mildewicide where required T2 (GS 37-49) Rhynchosporium Net Blotch Ramularia (Mildew) (Rust) (Fusarium) Mixtures SDHI/azole/Strob/multisite Mildewicide where required Activity of mix partners must be matched!!

20 Take home messages 1 st application Mid-late tillering 2 nd application Awn emergence Equal spend at each timing Use a minimum of 2 actives at each application Tailor your spend to the crop

21 Thank you for listening Best wishes for the coming season