|Winter Oilseed Rape||
Short crops make easy transference of disease within canopy (photo from Farming Online).
South East: Crops now mostly range from GS31- 33. September sown Trinity and Reflection are showing leaf 2 at 50%+ emerged, and late September/early October sown Skyfall and Crusoe are generally at leaf 2 about 10-20% emerged. Arrival of warmer days in last few days, with no frost is helping accelerate crop growth again now. T1s applied to all but most backward crops now and these should all be completed by early this week – now looking as though T2 will arrive as normal somewhere between 15th-20th May.
Brown rust: colder conditions in April together with both T0 and T1 triazoles have slowed any progression of rust to newest leaves.
Yellow rust: T0 triazole applications appear to be holding disease progression and T1 applications should maintain foliar protection until T2.
Mildew: may well increase again on susceptible varieties now warmer weather has arrived and canopies thicken up.
Septoria: cool conditions of last 3-4 weeks have certainly helped in reducing visible inoculum levels on any newer growth and with latent period currently likely to be around 28 days should help efficacy of triazole element of T1 programmes
Eyespot: increasingly visible now with cool and damp soils favouring development, particularly in earlier sown crops of Crusoe, along with second wheats and wheat after oats.
Aphids: BYDV symptoms surprisingly high levels also evident in some fields in sheltered coastal locations.
Slugs: some very high levels of leaf shredding now evident in some fields after oilseed rape again, with every emerged leaf being grazed. re-pelleting required on worst fields.
Weed control: blackgrass control looks to be below expectation probably due to very variable temperatures during March applications.
Eastern Counties: Earliest drilled crops now have final leaf 2 fully emerged (Gallant) and flag leaf emerging, most have final leaf 3 out with final leaf 2 on the way, latest drilled leaf 3 showing. Weather is finally warming up.
Brown rust: trace levels only.
Yellow rust: T0 keeping this disease in check so far.
Mildew: none seen
Septoria: low levels on all varieties but some bad hot spots in thicker crops.
Eyespot: some lesions now showing in second or subsequent wheats. Not generally penetrating too far into the stem.
Aphids: None found but patches of BYDV now showing up in crops from winter infection.
Weed control: Blackgrass now heading, some flowering!
East Midlands: Later crops have tip of final leaf 3 just showing. Most crops have final leaf 3 out and some with leaf 2 tip. Only the latest crops have leaf 3 emerging. Some field which had wet patches have some part at leaf 3 fully out and later parts leaf 3 only 50% out. T1 are now going on aiming for no longer that 3 weeks after T0.
Brown rust: none seen
Yellow rust: A trace found on Lilli which is due for T1, so should be OK but otherwise T0 azoles have kept it at bay. Skyfall continues to impress with clean crops
Mildew: remains very low
Septoria: Leaf 3 and 4 are clear and look good but lower leaves (now dying off) have a good inoculum levels although T0s have held it back well.
Eyespot: generally at low levels and not penetrating outer leaf sheaths.
Aphids: None seen
Weed control: some brome has not died back as well as expected, but this may be a temperature thing at spraying with up and down temperatures in March.
West Midlands: Early sown Crusoe in the lead at the moment with final leaf 2 fully out and flag leaf making an appearance, early sown Reflection not far behind with Grafton running a close third at the moment but I expect it will overtake the other two in the next 7 days.
Yellow rust: very much in the decline. Reflection has been worse variety, as on early sown crops final leaf four has gone (due to yellow rust) this despite T0 and T1 treatments with robust triazole.
Mildew: now virtually non existent
Septoria: is under control at the moment. All T1 applications will be done by the end of this week as have no crops without leaf 3 at least half out and crops now growing quickly with this warmer weather.
Aphids: BYDV patches becoming more evident in many crops now.
Weed control: grass weed herbicides taking an age to work but hopefully due to mainly dry cold conditions.
North East: Crops range from late drilled now at GS 31 to September drilled up to GS 33.
Brown rust: None seen
Yellow rust: Reflection at high levels, trace levels on KWS Lili.
Mildew: low levels in variety Leeds.
Septoria: most varieties really showing signs again, on younger leaves now. T1 applications 40% complete.
Weed control: blackgrass remaining populations well established, early drillings worst, up to 28 tillers, flag leaf emerging.
Winter Oilseed Rape
Keep checking for Seed Weevil (photo from Farming Online).
South East: Finally crops have exploded into flower this week with the arrival of sunshine and warmer days, though there are still some backward crops/pigeon grazed fields that have yet to get beyond Yellow bud.
Light leaf spot: conditions remain very favourable for renewed infection meaning that early flowering sprays will need to have good Light leaf spot activity.
Sclerotinia: with many crops now at early to mid-flowering and warm showery conditions forecast for next week the risk of potential infection is increasing as petals begin dropping – spores have been detected on petals at monitoring sites
Club root: severe symptoms found in only two fields so far.
Pollen beetle: beginning to be found more readily now, but only really a potential problem on the more backward and pigeon grazed crops.
Seed Weevil: non seen yet.
Eastern Counties: Many varied growth stages in fields. Some are now at mid flowering with varying levels of pods set, whilst some are still only just showing signs of flowering in parts of the field. Mainly linked to wet, pest damage and weed burden. A long period of warm sunny weather is desperately required.
Light Leaf Spot:: variable levels across different fields and varieties.
Aphids: none seen.
Seed Weevil: non seen yet.
East Midlands: Many crops getting towards mid flower with some crops at 15-20 pods on main stem, but pigeon damaged areas still remain backward with some patches still to flower.
Light leaf spot: a few new spots found last week in Arazzo but with late Sclerotinia sprays going on now this should be sorted.
Sclerotinia: many crops will get one mid flowering spray to see them through.
Seed weevil: None seen yet
West Midlands: West Midlands. Flowering within some crops is still patchy despite the recent warm spell. However, many crops are at full flower to early pod set and Sclerotinia sprays are now either on or scheduled to go on this week.
Light leaf spot: crops now treated.
Pollen beetle: low levels especially in backward areas of crops.
Seed weevil: none seen
North East: Crops now range from yellow bud to early petal fall. Some crops are looking short where soils have been wet.
Light leaf spot: noticeable on all varieties, still causing issues.
Pollen beetle: low levels.
Seed weevil: None seen
Cabbage stem flea beetle: larvae causing some damage in few rape crops.
South East: More forward crops now at around GS33-37 and more backward fields around GSS32 – all crops have had T1 fungicides applied and T2 applications will be imminent at Awns emerging
Eastern Counties: GS 33 - 37 common. Furthest forwards have awns emerging. BYDV patches evident even where insecticides used. Crops remain short with little straw, very patchy across most fields. Warmer weather will help.
West Midlands: Crops are all at flag leaf emerging with some of the most forward crops now with the flag leaf fully out . All are very clean. BYDV quietly showing more and more, early sown crops even with Deter seed dressing is not a pretty sight (probably up to 15-20% damage).
East Midlands: Flag leaf just starting to emerge in earlier crops and leaf 2 in later crops. Disease levels remain low so far with clean new growth.
North East: Crops mainly at GS 33 - 37. Brown rust no longer an issue after T1, some leaf spotting, either stress of dead tissue following mildew control.