Crop Report: 25 May 2007
Report compiled by Farming Online from reports
received from members of the Association of Independent Crop Consultants
Disease Alert - Brown rust still widespread and moving up the canopy.
Active in the South on Alchemy and Zebedee in particular. Also at lower levels in Claire, Consort, Robigus and Solstice.
Trace to low levels, in Alchemy, Claire, Robigus and Solstice in West Midlands and North East.
Pest Alert -
First reports of midge being found in Essex and Suffolk but at low levels.
South, Midlands, North East, none or very few seen to date. If you've had more than 10mm of rain, note the date (for many this was 13 May). Midge will
start to pupate, and will take two to three weeks before hatching. Should this coincide with ear emergence, then susceptible varieties will need spraying.
Earliest emergence is expected around 24 - 27 May.
NOTE. Early sown crops are now beginning to flower (early Anthesis), once crops reach this stage their natural resistance to WOBM increases and treatment is no longer necessary.
Crop development - Crops on course for an early harvest.
Growth stages of most winter crops remain 10 - 14 days ahead of last season. They are now at the growth stage when temperature is the main determinate of when they will be fit to harvest.
Optimum temperatures for flowering and polllination are given as between 18 and 24oC, slowing rapidly when temperatures drop to the low teens. It is going to be a race between winter wheat
crops reaching flowering in advance of blossom midge emergence. The rate of increase in grain dry weight increases with temperature; there seems to be positive linear relationship between
temperature and mean grain growth rate up to temperatures of 16�C, but a negative relationship at temperatures higher than 16�C.
Highlights
Winter rape
Pod set good.
Crops are short.
Winter Wheat
Many crops at ear emerged.
Anthesis in early sown crops.
Brown rust still widespread on Alchemy, Claire, Solstice and Zebedee.
Midge levels low.
T3 targeted against rust and ear diseases.
Aphids in the South.
Fusarium control timing critical.
Winter Barley
Crops setting seed.
Disease levels low.
Spring Beans
First signs of downy mildew.
First signs of chocolate spot.
Soil Temperatures
Winter Oilseed Rape
South East: all crops have now finished flowering and await desiccation/combining.
South West: crops now well into seed fill. Canopies still standing well and have filled out noticeably as moisture allows N uptake.
No adult saw fly seen as yet.
East: the next operation for most crops will be desiccation or harvest.
Some poppies beginning to flower and show themselves in thin areas on light land, reports Pat Turnbull.
East Midlands: pods developing well and rain come in time to keep them going - harvest end June/early July on the cards.
West Midlands: crops now finishing flowering.
North East: apart from late sown crops or areas of flood or pigeon damage, crops have now finished flowering.
A number of growers will apply Foliar N + Trace elements during next 7 days to see if can achieve extra yield as has been obtained in Germany and France.
Winter Wheat
Ambrosia flowering 22 May 07 Photo Farming Online.
South East
Crop development: All September and early October sown crops now commonly range between GS55-61 and in many cases anthers are visible - this is
still around 2 weeks ahead of normal (harvest in last week of July?). Crops have generally improved dramatically in appearance; however yield prospects on lighter/shallower soils
have been slashed by around 25-50% in some cases. Soil surfaces have remained damp following 2.5 - 3 inches of rain in the last 14 days, but we still have an SMD of around 2 inches,
so drought stress is an ever present prospect if hot dry conditions return.
Brown rust : widespread on lower leaves all September sown crops of Alchemy, Claire, Solstice and Zebedee in particular. Active pustules
now increasingly evident on upper leaves of crops where last fungicides applied around 2-3 weeks ago, with odd pustules now appearing on leaf 3 and 2 of thicker crops.
Mildew : still very hard to find any active pustules.
Septoria : very little evidence of Septoria in many crops from leaf 4 and above.
Eyespot : a few very early drilled Solstice (18-22 September) crops have such severe penetrating eyespot on main shoots, that in some cases these are already lodging.
Yellow rust : controled by fungicides.
Aphids : low levels of Grain aphids now being found in many wheat crops, but in general only isolated colonies can be found.
Wheat blossom midge : none seen yet, though one farm with traps growing continuous wheat has caught a few adults in pheromone traps in last 48 hours, but not threshold.
Most crops now flowering, so should no longer be at risk.
South West
Crop development: All wheat crops at ear emerging with anthesis common in drillings pre mid October. Wet spell has given way to warmer drier conditions.
No wheats showing moisture stress at present. Rain forecast for the weekend should keep things that way. Flag leaf spraying is now fully complete.
Brown rust : continues to be a major problem, especially on Alchemy and Zebedee. Brown rust seems to be cycling rapidly and high vigilance with spray intervals is essential.
T3s on these varieties will include ai's that are highly active against rusts.
Mildew : levels still not giving cause for concern. Generally only on the stem.
Septoria : lowest levels of Septoria for many years.
Yellow rust : earlier epidemic now well contained by rust active triazoles.
Eyespot : some lesions have continued to penetrate.
Aphids : small colonies of bird cherry aphids building on leaves one and two.
East Midlands
Crop development: Forward crops have ears well emerged and later crops have ears 25%+ out. Generally crops look well, but any very late drilled,
some second wheat and some on very light soils have been affected first by wet winter and then drought in spring; reducing tiller numbers and height. Mid September crops look well
and have put on a spurt of growth recently. Fine weather all week has allowed spraying to get up to date and all T2 sprays finished this week.
Mildew : levels very low.
Septoria : most crops clean down to leaf 4.
Brown rust : not a major problem.
Yellow rust : may need T3 on Robigus if pressure rises again.
Eyespot : no progress of disease.
Aphids : none seen as yet and wet/cool weather forecast will keep them down.
Wheat blossom midge : none seen yet in spite of Dow warnings of high levels in Northants. None seen in traps and unsettled weather to come should lower risk, but be vigilant.
West Midlands
Crop development: Most wheats at booting to ear emergence with early sown crops now beginning to flower.
Some crops of Einstein staring to flower before the heads are fully out, also with Alchemy, although to a much lesser extent.
Ground has once again dried up quite considerably, very noticeable greening up of crops as they are finally taking nitrogen up.
Most T2 applications now finished. Still some very thin crops amongst the later sowns particularly where the soil has slumped.
Brown rust : still only finding very isolated cases but occasionally moving up the crop.
Mildew : visible on late sown crops at trace levels.
Septoria : clean crops at the moment but expecting pressure to rise with the high levels of rainfall combined with warm conditions.
Eyespot : still visible on stem bases, particularly Einstein.
Aphids : colonies visible in the bottom of crops but not increasing as yet.
Wheat blossom midge : very low levels in occasional crop and risk diminishing.
East
Crop development: A few crops in full flower with late drilled at ear emerging from the boot. All crops now uniformly
green but second wheat and crops on light land painfully thin. Strange phenomenon of small flag leaves, particularly on Robigus fields, especially
if previously drought stressed. Means leaf 2 and 3 are more important. Warm dry weather this week and last weekend has allowed delayed T2 to go on (7-10 days late).
Brown rust : still causing concern in Alchemy and some pustules on lower leaves of Solstice.
Yellow rust : no fresh outbreaks of disease.
Mildew : low levels at base of crop on Einstein.
Septoria : risk very high although still in latent period.
Eyespot : at low levels.
Wheat blossom midge : between 50 and 70 mm rain so far in May. Should be enough to set off blossom midge.
The last two evenings have been good for midge flight but few found. Report of low level found in one particular hotspot.
North East
Crop development: Most wheats at 50 - 80 % ear emergence, and some later crops in boot. Another dry week,
only 5 mm over last 7 days, but all crops responded well to earlier heavy rainfall. It was just too late for some second wheats which
are irretrievably short with few tillers but most crops look fine.
Brown rust : low level on older leaves in most crops of Alchemy. In situations where T1 was late
or where very dense crop, and hence limited spray penetration, have much higher levels of surviving infection. Other varieties only
have traces of infection e.g. Claire, Einstein and Cordiale.
Mildew : slight increase on light land.
Septoria : always present on older leaves. Rain has increased the risk.
Eyespot : low levels, no increase.
Yellow rust : no new infection seen this week, but crops still at risk.
Aphids : low levels present in crop canopies now.
Orange blossom midge : none flying yet. It's only 14 days since it rained and soil temperatures
are just below the critical 13°C., but close enough to need to be vigilant over next few weeks.
Winter barley
South East: All crops now at grains half full and await the combine in early to mid-July.
South West: Many crops flowering and all treatments except pre harvest glyphosate now complete.
Midlands: All crops now flowering and starting grain set. Some Saffron has lodged under extreme wet/windy conditions on fertile land.
East: Crops range form GS 39 - 63 (full flag to early flower). Low disease levels
North East: Most crops at early flowering now. Crops looking lusher after some rain.
Spring Beans
Downy mildew on spring beans Photo Farming Online
South East: Crops are just beginning to flower, and have first signs of chocolate spot now developing.
South West: Early to mid flowering.
Bruchid beetle : first insecticide will be applied
with fungicide at mid flower followed by second dose 7 days later. Usual caution re bees advised.
Midlands: Downy mildew : starting to come into Fuego.
North East: Chocolate spot : at low levels.
Crop Report compiled by Farming Online from reports
received by members from the Association of Independent Crop Consultants
delivered to the industry by HGCA
This website was last updated on: 08/05/2008
© Crown Copyright Central Science Laboratory 2007
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