17 May 2012: Winter wheat crops moving towards T2 flag leaf fungicide timing. The cold weather over the last 7 days has delayed full flag leaf emergence for the majority of crops. Forecast for warmer weather next week should see these crops develop and we may find that they move through to ear emergence quickly. Eyespot and Septoria are the two main disease worries at the moment. Oilseed rape just carries on flowering with some crops now into their six week. Aggressive chocolate spot reported in winter bean crops in the South and in the East Midlands. Downy mildew on spring beans at very high levels.
Septoria: risk remains high.
T2 fungicide: timing in winter wheat a priority.
Ear emergence: out in some very forward wheat crops.
Eyespot: becoming more obvious.
Awns: emerging in winter barley.
Sclerotinia control: second treatments.
Chocolate spot: aggressive in winter beans.
Downy mildew: at high levels in spring beans.
Sharp Eyespot lessions in Grafton
(picture courtesy Farming Online).
South East: All crops now range between GS 37-39, with a few crops of Gallant sown around 22nd - 25th September now with ears emerging despite unseasonably cool conditions of late. Quite a number of September/early October sown crops of Solstice and Xi19 give the impression that if conditions warm up suddenly that they will move to ear emergence very quickly. A slightly drier week and a bit of sunshine has finally enabled spray programs to get back on track.
Brown rust: only really present now in crops where T1 application timings have been seriously delayed/compromised and mainly in thicker crops of September sown Claire, Target and Solstice.
Mildew: most crops remain free of any re-infection to date - only exception is a few lush crops of Gallant/Solstice.
Yellow rust: no new foci or leaf pustule stripes seen, but remaining vigilant particularly on susceptible crops where T1 spray intervals since T0 have stretched beyond 21-28 days
Septoria: any crops where T1 applications were delayed by 14 days now have Septoria lesions beginning to show up on leaf 3 - these crops need to be sprayed as a priority with T2 applications once main shoots are at GS39 to minimise infections of leaf 2 and protect the flag leaf.
Eyespot: a lot of obvious eyespot lesions now appearing in many September/early October sown crops (particularly Cordiale, Gallant and Solstice) due to the highly favorable weather this year - some mid-September sown Gallant is beginning to lodge now due to severe penetrating eyespot.
Weed control: all spring applications of Atlantis have now been completed - so far control of black grass is looking perhaps more comprehensive than some Autumn applications have been.
Eastern Counties: Flag leaf emerging at last.
Brown rust: now showing on untreated varieties.
Yellow rust: high levels in untreated crops which are susceptible. Also now showing on crops which were treated a month or so ago.
Mildew: the more backwards crops showing quite a lot of mildew.
Eyespot: showing on crops but is not really penetrating the leaf sheath.
Septoria: showing in the older leaves and with wet weather it has a lot of potential to spread. Invicta seems to be quite badly affected.
Take-all: starting to see symptoms in second wheats.
Weed control: late emerging wild oats are appearing right in the bottom of the crop canopy. Cleavers are also emerging.
East Midlands: Most crops have flag leaf emerging with some 40% out to tip just showing. Although the cooler weather is slowing down emergence.
Brown rust: none seen.
Yellow rust: T1 have kept crops clear but T2 will need to be timely.
Mildew: levels remain low although a bit on the lower stems of Humber but not a significant levels.
Septoria: found on many crops where T1 delayed, usually just on tip of leaf 3, but top 3-4 leaves generally clean so far.
Eyespot: can be found but not always penetrating. Expect to see more where T1 delayed, especially where using a T1 for eyespot and lack of penetration in thick crops.
Weed control: cleavers generally now under control with a final clean up at T2 where numbers low.
West Midlands: Flag leaf fully out on light land crops but elsewhere emergence of the flag leaf has virtually stopped. Warmer weather forecast for next week should see them finally emerge.
Brown rust: none seen.
Yellow rust: traces on Oakley where T1 delayed..
Mildew: none seen.
Eyespot: sharp eyespot (Rhizoctinia cerealis) rife in some crops and in worst cases crops are showing distinct pale patches.
Septoria: beginning to appear on tip of leaf 3 where T1 fungicides were delayed.
Weed control: it is turning into a grass weed year as more bromes become visible.
North East: All crops at least GS 37, and a few early sown crops of Viscount and Robigus at GS 39, flag leaf fully emerged. A further 21 mm of rain over last 7 days, so tramlines are wet and muddy, but T2 has to be applied in next few days to many crops.
Brown Rust: no new infection seen.
Yellow Rust: no new infection seen.
Mildew: no new infection seen.
Eyespot: more lesions penetrating the outer leaf sheath seen this week.
Septoria: most crops still have acceptable levels of visible infection, but a few instances of dense crops of Viscount now have high levels within the crop canopy.
Weed control: Areas of poor control of blackgrass becoming more evident now. There are going to be some fields with significant patches come the Summer.
Winter Oilseed Rape
Seed Weevil beginning to enter crops.
(picture courtesy Farming Online).
South East: Most crops should finish flowering in the next 7-10 days now. This year has seen an incredibly extended flowering period with many crops having been in flower for 6 weeks or so now - however pod set is perhaps not as extensive as might be expected from this duration of flowering.
Phoma: no significant renewed spotting seen to date.
Light Leaf Spot: no new infections seen.
Seed Weevil: low levels of adults seen in quite a few crops in the last 7-10 days whenever sun is out.
Mealy aphids: colonies beginning to be noted around headlands in particular.
Sclerotinia: this looks to be a potentially very high risk year.
Eastern Counties: Most crops are still heavily in flower with no lodging yet. Pods seem to be setting well.
Light leaf spot: remained at low levels none on upper leaves, recent conditions have not been conducive to spread of this disease.
Mealy aphids: in small clusters scattered in some crops.
Pollen Beetle: surprising amount of recent pollen beetle damage on late flowering pigeon damaged crops considering the recent low temps and wet weather.
Sclerotinia: still the odd crop with the first Sclerotinia spray to apply.
East Midlands: Most crops at late flowering but a lot of lower racemes still to flower in many crops and expect flowering to continue for the next 2-3 weeks.
Light Leaf Spot: just odd pieces but nothing of concern.
Seed Weevil: numbers remain low with one client reporting none on front of sprayer after doing his T2 sclerotinia spray over 400 acres.
Sclerotinia: just the odd delayed spray now with rates increased to become a mid flowering spray.
West Midlands: Some crops just starting to look as though they are losing their very yellow look, but many still have flower buds yet to open within the crop. This is going to be a very protracted flowering period.
Phoma: no new infections.
Light Leaf Spot: very low levels which have not developed.
Seed weevil: the odd weevil venturing out.
Sclerotinia: first crops now hitting 4 weeks since first sclerotinia spray.
North East: Crops continue to flower strongly, and are currently at densest yellow. Pods are setting well. The last lot of heavy rain has lodged a few crops now, notably DK ExPower, but most crops are OK.
Phoma: no further infections seen.
Pollen Beetle: crops coming into flower are no longer at risk.
Sclerotinia: The wet conditions are highly favorable to Sclerotinia infection, and crops have been in flower for a long time now.
South East: Crops now at awns/ears emerging - but emergence of ears is very slow in many crops due to cool conditions.
Eastern Counties: Some have flag leaf out and awns poking through. Disease control is good.
East Midlands: Awns now emerging. T1 have kept net blotch and Rhynchosporium under control and T2 sprays now on.
West Midlands: Awns emerging on most forward crops. Even crops with two spray applications are showing signs of BYDV.
North East: Most crops at GS 49, with awns just emerging. T2 fungicide planned for soon as awns mostly emerged.