An Introduction to SCEPTREplus Joe Martin
Content • SCEPTREplus • Relevance to Carrot and Onion Growers • Weed control Trials • Knowledge Exchange • Priorities for Year 2
To deliver applied research on high priority disease, pest and weed problems in fresh produce and ornamental crops in order to support approval of products and devise and develop IPM programmes • Consortium approach • Financial contributions from Agchem / Product Manufacturers / Producers • In kind contributions • Industry Steering groups with representatives from different sectors • Embedded Knowledge Exchange • Flexible approach
4 year £1.4m AHDB 134 products being programme: investment evaluated 2017-2021 • 104 conventional products • 11 biologicals 18 on priority crop • 8 biopesticides protection problems in • 12 botanicals 18 trials year 1: • 8 weed trials • 6 pest trials Crop protection • 4 disease trials companies have contributed financially 3 or in-kind Model crop trial approach with 20 6 different targets: onion thrips; aphids; EAMU applications western flower thrips; downy different test crops already submitted mildew; bacterial diseases and selected to CRD Pythium root rot
Year 1 Targets
Carrots Weed control in Carrots and Parsnips Aphids Relevance for Carrot and Onion Growers Onions Downy mildew (model Crop) Onion thrips on Leeks
Carrot and parsnip herbicide trials • 4 sites • Nottinghamshire and Suffolk • Sandy loam soils • Carrot and parsnip trial at each site • 12 pre-emergence treatments in Carrots on 21 June- Notts combination with pendimethalin + clomazone (carrot) or pendimethalin + metamitron (parsnip) • 6 post-emergence test treatments applied after a standard pre-em • 3 replicates • Carrots drilled late May Parsnips on 27 July - Suffolk • Parsnips drilled early May
What was done, and what happened when • Spray timings • Pre-emergence – within 5 days of drilling • Post-emergence – at 1-2 true leaf, and again at 3-4 true leaves • Assessed weed levels and crop safety • At each post-emergence spray application • 2, 4 and 8 weeks after the final post-em application • Root sample Untreated 1m 2 area per plot • Suffolk • Counted, weighed and graded Untreated • At spray application, conditions in Notts were wetter than the Suffolk Suffolk sites • Regional differences in crop safety • Weed levels in untreated, high in parsnip, low in carrot but useful crop safety data from carrots
Crop effects After Gamit applied once at 0.1 L/ha post-emergence • Pre-emergence treatments all applied with Stomp Aqua + (clomazone or metamitron) • Post-emergence all applied after Stomp Aqua + AHDB9947 (+ clomazone or metamitron) • All post-emergence treatments checked both the parsnip and carrot crops when assessed 2 weeks after application, but effects appear to be transient and most had recovered to acceptable based on foliar appearance at 8 weeks after application Yellow spotting after AHDB9997 pre-em • Some pre-emergence treatments also checked crops, more so in Notts where rainfall was more intense around applications, again effects appeared transient Scorch after AHDB9997 post- em • Root data still to be analysed – Final piece!
Promising treatments to take forward Carrots Parsnips Crop safe by foliar appearance Equivalent weed control Crop safe by foliar appearance (at 2 Equivalent weed (at 2 months after last post-em to linuron? Note: low months after last post-em control to application) weed numbers application) linuron? AHDB9947 pre-em No AHDB9947 pre-em Yes AHDB9999 pre-em Yes AHDB9999 pre-em Yes AHDB9998 pre-em Yes AHDB9997 pre-em Yes AHDB9997 pre-em* Yes AHDB9996 pre-em Not at both sites AHDB9996 pre-em* Yes AHDB9995 pre-em Yes AHDB9995 pre-em* Yes Aclonifen 1.5 L/ha pre-em Yes Aclonifen 1.5 L/ha pre-em* Yes Tri-allate pre-em No Tri-allate pre-em Yes AHDB9947 post-em Yes AHDB9947 post-em Yes AHDB9997 post-em Yes Clomazone 0.1 L/ha fb 0.2 L/ha Not at both sites AHDB9993 post-em Yes AHDB9993 post-em Yes Aclonifen 1.0 L/ha x 1 post-em Yes Aclonifen 0.5 L/ha x 2 post-em* Yes Aclonifen 0.5 L/ha x 2 post-em Yes
Open days / Knowledge exchange Celery Sweetcorn Carrots
Year 2 Priorities • Decision being made this autumn • We welcome your input • Contact us • Joe.martin@ahdb.org.uk
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